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WITH PLURAL AMPLIFIER CHANNELS (E.G., PARALLEL AMPLIFIER CHANNELS)

Subclass of:

330 - Amplifiers

Patent class list (only not empty are listed)

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Class / Patent application numberDescriptionNumber of patent applications / Date published
330126000 Amplifying different frequencies in different channels 8
330124000 Redundant amplifier circuits 5
20090206927Amplifier - There is provided an amplifier for combining outputs of a plurality of amplifying circuits to generate an amplifier output. The amplifier includes a first amplifying circuit for operating a first amplifying device in class-AB, wherein the first amplifying circuit is one among the plurality of the amplifying circuits; a second amplifying circuit for operating a second amplifying device in class-B or class-C, wherein the second amplifying circuit is one among the plurality of the amplifying circuits; and a summing node at which an output of the first amplifying circuit is combined with an output of the second amplifying circuit via a first impedance transformer containing a transmission line of an electrical length other than λ/4. The second amplifying device is connected to the summing node via an output matching circuit and a second impedance transformer containing a transmission line.08-20-2009
20110199156POWER AMPLIFIER AND AMPLIFICATION METHOD THEREOF - A power amplifier according to the present invention includes: a carrier amplifier (08-18-2011
20120200353POWER AMPLIFIER AND METHOD OF OPERATION THEREOF - A power amplifier is provided which is capable of performing efficient amplification in a wider transmission signal power range than conventional power amplifiers. The power amplifier for amplifying and outputting an input signal includes first to N-th amplifiers (N is an integer of two or more) which are cascaded. A Doherty amplifier is used in circuit configuration of each of the first to N-th amplifiers. At least one of the first to (N−1)-th amplifiers has a different power ratio from that of the N-th amplifier.08-09-2012
20130027128Systems and Methods of RF Power Transmission, Modulation, and Amplification - Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.01-31-2013
20100156528MULTIPORT AMPLIFIERS IN COMMUNICATIONS SATELLITES - Feedback loops are used within a Multiport Amplifier (MPA) of a communications satellite to maintain phase and amplitude tracking and hence isolation and combining performance. at Ku and Ka-bands, for which there is increasing interest in MPA applications, and where wavelengths are short and maintenance of phase/amplitude tracking becomes highly challenging. Feedback loops are located at strategic points within the MPA Output Network (ONET) to detect tracking errors and provide compensation. Errors are detected through power measurements at “null points”, with zero power corresponding to accurate tracking. The feedback loops adjust the MPA phase/gains such that the levels at these points are maintained at zero. The scheme operates with a pilot signal for measurement of nulls, injected at one of the MPA inputs.06-24-2010
20100117727ASYMMETRIC MULTILEVEL OUTPHASING ARCHITECTURE FOR RF AMPLIFIERS - A radio frequency (RF) circuit includes a power supply configured to generate a plurality of voltages, a plurality of power amplifiers, each having an RF output port and a power supply input port, a switch network having a plurality of input ports coupled to the power supply and a plurality of switch network output ports coupled to the power supply input ports of the plurality of power amplifiers, wherein the switch network is configured to output selected ones of the plurality of voltages from the plurality of switch network output ports, at least two of the switch network output port voltages capable of being different ones of the plurality of voltages, and an RF power combiner circuit having a plurality of input ports coupled to RF output ports of the plurality of power amplifiers and an output port at which is provided an output signal of the RF circuit.05-13-2010
20100117728Signal Amplifiers Having Communications Paths that Automatically Terminate to a Matched Termination in Response to a Power Interruption and Related Methods - RF signal amplifiers are provided that include an RF input port, a first RF output port, a second RF output port and a power input for receiving electrical power. These amplifiers further include a directional coupler having an input that is coupled to the RF input port, a first output and a second output. The second output of the directional coupler is connected to the second RF output port via a non-interruptible communication path. A first switching device having an input, a first output and a second output is also provided. The second output of the first switching device is coupled to a first matched termination. A first diplexer is provided that is coupled between the first output of the directional coupler and the input of the first switching device. A first power amplifier is coupled to the first output of the first switching device, and a second diplexer is coupled between an output of the first power amplifier and the first RF output port. The first switching device is configured to pass signals received at the input to the first switching device to the first output of the first switching device when electrical power is received at the power input and is further configured to terminate signals received at the input to the first switching device through the second output of the first switching device when an electrical power feed to the power input is interrupted.05-13-2010
20100117726AMPLIFIER APPARATUS - An amplifier capable of lowering an electrical current flowing in a peak amplifier before a carrier amplifier becomes saturated to thereby improve the efficiency of an entirety of the amplifier is provided. The amplifier includes a carrier amplifier circuit having an amplifying element operable in class-AB or class-B, and a plurality of peak amplifier circuits which have amplifying elements operating in class-B or class-C and which are arranged to start an operation in stages in response to an input level. An output of the carrier amplifier circuit and outputs of the peak amplifier circuits are combined together for signal output. One of the peak amplifier circuits which is rendered operative at the lowest input level is smaller in saturation output than the carrier amplifier circuit.05-13-2010
20120161865AMPLIFYING DEVICE AND AMPLIFYING METHOD - An amplifying device includes a signal separating unit that separates a first signal and a second signal from an input signal; a first signal-generating unit that generates, based on the first signal, a first cancelling signal that suppresses ringing caused during processing of the first signal; a first combining unit that combines the first signal and the first cancelling signal; a first amplifying unit that amplifies a signal output from the first combining unit; a second signal-generating unit that generates, based on the second signal, a second cancelling signal that suppresses ringing caused during processing of the second signal; a second combining unit that combines the second signal and the second cancelling signal; a second amplifying unit that amplifies a signal output from the second combining unit; and a third combining unit that combines a signal output from the first amplifying unit and one output from the second amplifying unit.06-28-2012
20100052779DOHERTY AMPLIFIER AND SIGNAL AMPLIFICATION SYSTEM HAVING THE SAME, METHOD FOR AMPLIFYING SIGNAL - A Doherty amplifier is provided. The Doherty amplifier includes a first path circuit including a carrier amplifier and a first impedance adjusting circuit connected with the carrier amplifier; and a second path circuit including a peaking amplifier, a second impedance adjusting circuit connected with the peaking amplifier, and a peaking amplifier bias circuit connected with the peaking amplifier. At least one among an impedance of the first impedance adjusting circuit, an impedance of the second impedance adjusting circuit, and a bias of the peaking amplifier bias circuit is adjusted in response to a control signal.03-04-2010
20100164619AMP OUTPUT PROCTECTIVE CIRCUIT FOR LCD PANEL SOURCE DRIVER - An AMP output protective circuit for an LCD panel source driver is disclosed. To solve a problem that internal diodes of PMOS/NMOS of an AMP output circuit are turned on, embodiments are characterized in making input and output voltages of the AMP in a charge sharing interval equal to HVDD and short-circuiting outputs of PAMP and NAMP with VRST_GH and VRST_GL lines, respectively. Accordingly, since there is no increase of voltage (Vth) attributed to a body effect, a speed is not reduced. An additional body bias control circuit is unnecessary. Power consumption can be reduced. Also, an AMP circuit can be more safely protected by adding an output reset function and an AMP protecting circuit.07-01-2010
20100148863Arrangement for reducing interference - An arrangement for reducing interference between circuit blocks having differences in the amount of input power and phase differences includes isolation wires located between the circuit blocks and connected to a ground.06-17-2010
20100073085Generation and Amplification of Substantially Constant Envelope Signals, Including Switching an Output Among a Plurality of Nodes - Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.03-25-2010
20110193627Method and Amplifier for Cancelling Magnetic Coupling - A method for cancelling magnetic coupling in an amplifier is disclosed. The amplifier includes a first path and a second path for outputting a first signal and a second signal, respectively, and the first signal and the second signal have a specific phase difference. The method includes forming a first LC tank and a second LC tank in the first path, and forming a third LC tank and a forth LC tank in the second path.08-11-2011
20110193626FREQUENCY RESPONSE COMPENSATION AMPLIFIER ARRANGEMENTS - An embodiment of the present invention provides a system comprising a summing device and first amplifier portion. The summing device is coupled to an output node. The first amplifier portion is coupled between an input node and the summing device. The first amplifier portion includes a first amplifier, a first filter, and first and second switches. The first amplifier is coupled between the input node and the summing device on a first path. The first filter is coupled between the input node and the first amplifier on a second path, the second path being in parallel to the first path. The first switch is coupled between the input node and the first amplifier along the first path. The second switch is coupled between the input node and the first filter along the second path.08-11-2011
20110193625Amplifier for Cable and Terrestrial Applications with Independent Stage Frequency Tilt - A system comprises a first amplifier stage including a first amplifier, a second amplifier stage including second and third amplifiers, and a fourth amplifier. The first amplifier stage includes an input and an output. The second amplifier stage is coupled between the output of the first amplifier stage and a first output node. The fourth amplifier is coupled between the input of the first amplifier stage and a second output node.08-11-2011
20110193624TUNABLE IMPEDANCE INVERTER FOR DOHERTY AMPLIFIER CIRCUIT - A tunable impedance inverter is presented for a Doherty amplifier circuit having first and second amplifiers connected in parallel between an input circuit for receiving an input signal and an output circuit for supplying an output signal to a load. An impedance inverter is coupled between the first amplifier and the output circuit. The inverter has an input and an output and a tunable mechanical strip line of variable electrical length interposed between the input and the output. An adjuster adjusts the electrical length of the strip line. The adjuster adjustably varies the electrical length of said pathway to thereby adjust the center frequency of said output signal.08-11-2011
20100073084SYSTEMS AND METHODS FOR A LEVEL-SHIFTING HIGH-EFFICIENCY LINC AMPLIFIER USING DYNAMIC POWER SUPPLY - Systems and methods may be provided for a LINC system having a level-shifting LINC amplifier. The systems and methods may include a dynamic power supply that is adjustable to provide at least a first voltage supply level and a second voltage supply level higher than the first voltage supply level; a first power amplifier that amplifies a first component signal to generate a first amplified signal; a second power amplifier that amplifiers a second component signal to generate a second amplified signal, where the first component signal and the second component signal are components of an original signal, where the first component signal and the second component signal each have a constant envelope, and where the original signal has a non-constant envelope, and where the first and second power amplifiers are biased at the first voltage supply level or the second voltage supply level based upon an analysis of an amplitude of the original signal.03-25-2010
20100033241HIGH FREQUENCY AMPLIFIER - Provided is a high frequency amplifier including two amplifying elements of different element sizes connected in parallel and switching the amplifying elements in accordance with a level of output power. In particular, the high frequency amplifier includes an output matching circuit for matching to characteristic impedance (50 ohms) both when the output power is high and low, and increasing impedance when the turned-off amplifying element is viewed from a connection node on an output side of the two amplifying elements. Consequently, characteristics such as high output power and high efficiency can be achieved and it is possible to prevent an amplified high frequency signal from passing around to a matching circuit on a turned-off amplifying element side.02-11-2010
20130082772DIGITALLY-SCALABLE TRANSFORMER COMBINING POWER AMPLIFIER - A digitally configurable transformer that performs switched transformer combining is disclosed. The flexible transformer includes switches that are dynamically configurable to efficiently combine RF power from power amplifier cores to achieve different power levels. The disclosed transformer is efficient at a broad range of power levels, leading to high power output efficiency. The transformer may be part of any power amplifier design that uses the transformer for power combining.04-04-2013
20100045373AMPLIFIER CIRCUIT - An extraction circuit is connected to an input path of an output amplifier. When the power is turned on, the extraction circuit extracts current on the basis of a difference between the normal rise of the supply voltage and a delayed supply voltage. Therefore, a steep rise in the input of the output amplifier when the power is turned on can be removed.02-25-2010
20100109769POWER AMPLIFIER - A power amplifier is provided with a signal generating circuit, a plurality of control signal amplifiers and an RF amplifier. The signal generating circuit outputs the amplitude modulation components of an input signal by dividing the components into a plurality of control signals, and outputs a modulation wave signal or the phase modulation components of the modulation wave signal. The control signal amplifier is provided with a pulse modulator, which performs pulse modulation of a control signal; a switching amplifier, which performs current amplification of a rectangular wave signal outputted from the pulse modulator; and a low-pass filter, which removes spurious components from the signal outputted from the switching amplifier. The RF amplifier amplifies the inputted signal, performs amplitude modulation with the signal outputted from the low-pass filter and outputs the amplitude-modulated signal.05-06-2010
20090278599PROGRESSIVE POWER GENERATING AMPLIFIERS - A power amplifier circuit includes an unequal power splitter that splits an input signal using an unequal power split and provides a first power level signal and a second power level signal. A first amplifier path includes a first transistor amplifier that amplifies the first power level signal, and a second amplifier path includes a second transistor amplifier that amplifies the second power level signal. The second transistor amplifier is configured to turn on at a different power level of the input signal than the first transistor amplifier. An unequal combiner combines the amplified first power level signal and the amplified second power level signal.11-12-2009
20130088292SOLID-STATE IMAGING APPARATUS - A solid-state imaging apparatus includes: an amplifier circuit configured to amplify a signal from pixel; and a reference signal generating circuit configured to generate a ramp signal, wherein feedback capacitor elements having the same structure are electrically connected to a capacitive feedback type amplifier of the amplifier circuit and to a capacitive feedback type amplifier of the reference signal generating circuit respectively, and a connecting configuration between an amplifier of the amplifier circuit and the feedback capacitor element and a connecting configuration between an amplifier of the reference signal generating circuit and the feedback capacitor element are the same.04-11-2013
20090322421POWER EFFICIENT TRANSMITTER WITH HIGH DYNAMIC RANGE - One embodiment of the present invention relates to a method for transistor matching. The power transmitter comprises a first, second, and third amplification path. The paths are selectively activated and deactivated to output a received signal with high efficiency and linearity. The first amplification path is configured to receive a first signal and output a first amplified signal to a first port of a output power combiner when activated and provide an impedance that results in a high reflection factor when deactivated. The second amplification path is configured to receive a second signal with 90° phase shift with respect to the first signal and output a second amplified signal to a second port of the combiner when activated and provide an impedance that results in a high reflection factor when deactivated. The third amplification path is configured to receive a third signal and output a third amplified signal to a third port of the output power combiner when activated and provide an impedance that results in an impedance that matches the output impedance when deactivated.12-31-2009
20090102553DOHERTY AMPLIFIER - The present invention relates to the construction of output stage of the Doherty amplifier and comprises a main amplifying unit, an auxiliary amplifying unit and a compact λ/4 line connecting two amplifying units. The compact λ/4 line connecting two amplifying units includes a first parallel capacitor grounded by being connected to the main amplifying unit in parallel; a second parallel capacitor grounded by being connected to the auxiliary amplifying unit in parallel; and an inductor or a microstrip transmission line connecting the main amplifying unit and the auxiliary amplifying unit. The Doherty amplifier in accordance with the present invention further comprises a matching network unit connecting to a final output by connecting the main amplifying unit and the auxiliary amplifying unit and; and a λ/4 line used as the voltage inputs of the main amplifying unit and the auxiliary amplifying unit.04-23-2009
20120218037CALIBRATION OF SIGNAL PROCESSING APPARATUS - A signal processing apparatus is provided that comprises a signal path including first and second signal processing stages for processing a signal. A switch, in a first state couples and in a second state de-couples an output of the first signal processing stage to an input of the second signal processing stage. An auxiliary stage coupled to the output of the first signal processing stage generates a control signal dependent to a DC level at the output of the first signal processing stage, on a DC level in the auxiliary stage, and indicates a DC offset at an output of the second signal processing stage. A calibration circuit, responsive to the control signal, adjusts a DC level in the signal path preceding the output of the first signal processing stage when the switch is in the second state.08-30-2012
20110006841SWITCHABLE BALANCED AMPLIFIER - A switchable balanced amplifier having multiple, configurable independent input/output paths. Switching networks coupled to the input and/or output quadrature couplers of the balanced amplifier are used to configurably direct any of one or more input signals to any of one or more output ports. In one example, each output port is coupled to circuitry tailored to a specific type of input signal, operating protocol and/or operating frequency band.01-13-2011
20090295473Power Amplifier Architectures - Implementations and examples of power amplifier devices, systems and techniques for amplifying RF signals, including power amplifier systems based on Composite Right and Left Handed (CRLH) metamaterial (MTM) structures.12-03-2009
20120223774LOOK-UP TABLE BASED CONFIGURATION OF MULTI-MODE MULTI-BAND RADIO FREQUENCY POWER AMPLIFIER CIRCUITRY - Circuitry, which includes multi-mode multi-band radio frequency (RF) power amplification circuitry, power amplifier (PA) control circuitry, and a PA-digital communications interface (DCI) is disclosed according to one embodiment of the circuitry. The PA control circuitry is coupled between the amplification circuitry and the PA-DCI, which is coupled to a digital communications bus, and configures the amplification circuitry. The amplification circuitry includes at least a first RF input and multiple RF outputs, such that at least some of the RF outputs are associated with multiple communications modes and at least some of the RF outputs are associated with multiple frequency bands. Configuration of the amplification circuitry associates one RF input with one RF output, and is correlated with configuration information defined by at least a first defined parameter set. The PA control circuitry stores at least a first look-up table (LUT), which provides the configuration information.09-06-2012
20120223773LINEAR MODE AND NON-LINEAR MODE QUADRATURE PA CIRCUITRY - Embodiments of the present disclosure relate to multi-mode multi-band radio frequency (RF) power amplifier (PA) circuitry, which includes a multi-mode multi-band quadrature RF PA coupled to multi-mode multi-band switching circuitry via a single output. The switching circuitry provides at least one non-linear mode output and multiple linear mode outputs. The non-linear mode output may be associated with at least one non-linear mode RF communications band and each linear mode output may be associated with a corresponding linear mode RF communications band. The outputs from the switching circuitry may be coupled to an antenna port via front-end aggregation circuitry. The quadrature nature of the quadrature PA path may provide tolerance for changes in antenna loading conditions.09-06-2012
20110012675POWER AMPLIFICATION DEVICE FOR SATELLITE COMMUNICATION DEVICE - A power amplification device for a satellite communication device with a redundant configuration, in which a plurality of power amplifiers including a standby power amplifier are connected in a ring shape, and which easily switches connection to the standby power amplifier in a case of a failure in active power amplifiers without closing a detour route. The power amplification device for the satellite communication device includes a plurality of basic units each including: a plurality of power amplifiers including at least one standby power amplifier, which are arranged in parallel; a plurality of switches provided to input ends and output ends of the plurality of power amplifiers for switching connection paths; and bypass connection lines for connecting the plurality of switches in a ring shape, and the plurality of basic units are connected in cascade.01-20-2011
20080315946Combiner-Less Multiple Input Single Output (MISO) Amplification with Blended Control - Multiple-Input-Single-Output (MISO) amplification and associated VPA control algorithms are provided herein. According to embodiments of the present invention, MISO amplifiers driven by VPA control algorithms outperform conventional outphasing amplifiers, including cascades of separate branch amplifiers using conventional power combiner technologies. MISO amplifiers can be operated at enhanced efficiencies over the entire output power dynamic range by blending the control of the power source, source impedances, bias levels, outphasing, and branch amplitudes. These blending constituents are combined to provide an optimized transfer characteristic function.12-25-2008
20130162350POWER AMPLIFIER - There is provided a power amplifier capable of increasing linear output power and efficiency without sacrificing an overall gain by employing a vector modulation function in a driving stage, with no separate vector modulator. The power amplifier includes a driving stage performing vector-modulation on an input RF signal to provide an I channel signal and a Q channel signal having different phases and amplifying the I channel signal and the Q channel signal to set gains; and a power stage amplifying power levels of the signals amplified by the driving stage.06-27-2013
201201128333-WAY DOHERTY POWER AMPLIFIER USING DRIVING AMPLIFIER - Disclosed is a 3-way Doherty power amplifier using a driving amplifier in which driving amplifiers are connected to the front stages of a carrier amplifier and a peaking amplifier, respectively, so as to obtain a high gain and a high efficiency. To this end, the Doherty power amplifier includes: a hybrid power distributor for distributing an input signal into first and second path units; and a driving amplifier for receiving a signal outputted from the hybrid power distributor and controlling the driving of a carrier amplifier, a first peaking amplifier, and a second peaking amplifier, wherein: the carrier amplifier, the first peaking amplifier, and the second peaking amplifier are connected to a rear stage of the driving amplifier, respectively; the first path unit generates a high efficiency at a low input power; and the second path unit maintains a high efficiency and gain in a high output range.05-10-2012
20100079205Multi-Channel Amplifier - Individual channels, to which a sound signal inputting portion In having a pin jack with NC setting and an amplifier circuit Amp are provided respectively, are provided in parallel from a higher order to a lower order every four L/R channels, and a cascade connection configuration in which a signal terminal S of the higher order channel is connected to an NC contact of the lower order channel successively is employed. Accordingly, the signal on the higher order side can be transmitted to the lower order side, and as a result there is no need to input the common (Bus) signal apart from the signals on the individual channels and also the changeover switch can be omitted.04-01-2010
20110279178Multi-band high-efficiency doherty amplifer - The present invention relates to a Multi-Band Doherty amplifier. Embodiments of the present invention provide an amplifying structure including a main amplifier configured to amplify a first signal, a peak amplifier configured to amplify a second signal, a tunable impedance inverter configured to perform impedance inversion to modulate a load impedance of the main amplifier, and a combining node configured to receive the amplified second signal from the peak amplifier and an output of the tunable impedance inverter. The tunable impedance inverter includes a tuner configured to tune the impedance inversion over at least one broad frequency band. The tuner is (i) at least one capacitor, (i) at least one varactor, or (ii) at least one open stub shunted by a diode.11-17-2011
20090231033Amplifier Circuit - Power consumption of current sources in an amplifier circuit is reduced even during amplifier operation while keeping linearity of an output signal. The amplifier circuit is suitable for use in a signal generator that provides an output signal previously set by a user and having a known level. Positive and negative current sources receive an input voltage Vi depending on an output voltage Vo. An output resistor derives the output voltage Vo from currents provided by the positive and negative current sources. A variable bias generation circuit produces positive and negative bias voltages applied to the positive and negative current sources wherein the positive and negative bias voltages are set while the linearity of the output voltage is maintains using the known output level information.09-17-2009
20110140776VARIABLE FREQUENCY AMPLIFIER - A variable frequency amplifier includes a main amplifier system 06-16-2011
20080272840Multiple-Input and Multiple-Output Amplifier - The invention relates to an amplifier capable of producing a plurality of currents at its output terminals, these currents being controlled by a plurality of input voltages. A multiple-input and multiple-output amplifier of the invention includes 4 signal input terminals, 4 signal output terminals, 4 active sub-circuits and a feedback network. Each active sub-circuit has a sub-circuit input terminal connected to one of the signal input terminals, a sub-circuit output terminal connected to one of the signal output terminals and a sub-circuit common terminal. The feedback network has terminals connected to the sub-circuit common terminal of each active sub-circuit. The feedback network presents, in a known frequency band, an impedance matrix producing a negative feedback such that the transfer admittance matrix of the multiple-input and multiple-output amplifier approximates a given admittance matrix.11-06-2008
20100007412PULSED LOAD MODULATION AMPLIFIER AND METHOD - Improved power amplifiers and related methods using a pulsed load modulation technique that controls the load modulation characteristics in a digital pulsed fashion.01-14-2010
20110285460HIGH FREQUENCY AMPLIFIER, WIRELESS DEVICE, AND CONTROL METHOD - Provided is a high frequency amplifier that can suppress from increasing the circuit size while improving efficiency at the time of low output. A high frequency amplifier according to one aspect of the present invention includes a carrier amplifier 11-24-2011
20120032738POWER AMPLIFIER - An efficient power amplifier with a design which, even in cases when the phase characteristics of high frequency devices used in a main amp and peaking amp differ, reduces the combination loss of the two amps at a wide range of output levels. A class AB power amplifier (02-09-2012
20110298537VOLTAGE DISTRIBUTION FOR CONTROLLING CMOS RF SWITCH - Disclosed are voltage distribution device and method for controlling CMOS-based devices for switching radio frequency (RF) signals. In certain RF devices such as mobile phones, providing different amplification modes can yield performance advantages. For example, a capability to transmit at low and high power modes typically results in an extended battery life, since the high power mode can be activated only when needed. Switching between such amplification modes can be facilitated by one or more switches formed in an integrated circuit and configured to route RF signal to different amplification paths. In certain embodiments, such RF switches can be formed as CMOS devices, and can be based on triple-well structures. In certain embodiments, various bias voltages applied to such a CMOS RF switch can be facilitated by a voltage distribution component.12-08-2011
20110291754Segmented Power Amplifier with Varying Segment Activation - Various apparatuses and methods for varying segment activation in a segmented power amplifier are disclosed herein. For example, some embodiments provide a power amplifier including an input, an output, a plurality of amplifier segments and a controller. The amplifier segments are connected in parallel between the input and the output and are adapted to be activated and inactivated. The power level at the output may be controlled by changing a number of the amplifier segments that are activated concurrently. The controller is connected to the amplifier segments and is adapted to vary which of the amplifier segments are activated to arrive at a selected number of activated amplifier segments.12-01-2011
20090167434DEVICE, SYSTEM, AND METHOD OF SEMI-DOHERTY OUTPHASING AMPLIFICATION - Device, system, and method of semi-Doherty outphasing amplification. For example, an apparatus includes: a first circuit path comprising a first switching amplifier connected in parallel through a first quarter-wave transmission line to a second switching amplifier; and a second circuit path comprising a third switching amplifier connected in parallel through a second quarter-wave transmission line to a fourth switching amplifier, wherein the first circuit path is connected to a circuit node through a third quarter-wave transmission line, and wherein the second circuit path is connected to said circuit node through a fourth quarter-wave transmission line.07-02-2009
20100033242SYSTEM AND METHOD FOR IM3 REDUCTION AND CANCELLATION IN AMPLIFIERS - Sets of power amplifier branches (which comprise an RF/microwave amplifier stage) are power combined within each stage and each set of power amplifier branches are biased in different classes of operation by bias circuits possessing different impedance characteristics such that the fundamental frequency components present at the output are in-phase with one another and the IMD3 components are anti-phase over a broad range of power levels. The RF input signal is provided by the output of the previous stage of the RF/microwave amplifier. The output of each stage is formed by power combining sets of these power amplifier branches, each of which are separately biased, so the fundamental components are additive resulting in the maximum possible output power and the IM3 components cancel partially or completely. IM3 reduction or cancellation can be achieved over a large range of output powers with the use of a feed forward control loop monitoring the input power and appropriately adjusting the bias currents and impedance characteristics of the bias circuits feeding the individual power amplifier branches in each stage of the RF/microwave amplifier.02-11-2010
20100033243Amplifying Apparatus - The amplifying apparatus includes an amplifier having a circuit constant determined so as to satisfy a condition for E-class operation; power detecting unit which detects an output electricity from the amplifier; and controlling unit which controls the circuit constant in accordance with the output power detected by the power detecting unit.02-11-2010
20110215865POWER AMPLIFIER - Disclosed herein is a power amplifier. The power amplifier includes N power amplification means, a transformer, and a harmonic elimination unit. Each of the N power amplification means amplifies an input signal into a predetermined level. The transformer includes N/2 primary windings respectively connected to the output terminals of the power amplification means and a secondary winding configured such that coil elements are connected in series between an output terminal and a ground, and sums power transmitted from the primary windings. The harmonic elimination unit is disposed across both ends of the secondary winding of the transformer, and eliminates the output of the harmonic frequencies of a preset frequency.09-08-2011
20120139628METHOD AND ARRANGEMENT IN A MOBILE COMMUNICATIONS SYSTEM - The invention is based on the fact that the current output from a DDB controlled amplifier in backoff, i.e. for low amplitudes, is reduced more or less linearly with the amplitude of the signal to be amplified. Therefore, it is enough to use smaller amplifiers which are able to output the necessary RF current. Hence, according to the present invention, the total DDB amplifier is divided into smaller parts that are coupled to the output only when needed.06-07-2012
20110215866 ASYMMETRIC MULTILEVEL OUTPHASING ARCHITECTURE FOR RF AMPLIFIERS - A radio frequency (RF) circuit includes a power supply configured to generate a plurality of voltages, a plurality of power amplifiers, each having an RF output port and a power supply input port, a switch network having a plurality of input ports coupled to the power supply and a plurality of switch network output ports coupled to the power supply input ports of the plurality of power amplifiers, wherein the switch network is configured to output selected ones of the plurality of voltages from the plurality of switch network output ports, at least two of the switch network output port voltages capable of being different ones of the plurality of voltages, and an RF power combiner circuit having a plurality of input ports coupled to RF output ports of the plurality of power amplifiers and an output port at which is provided an output signal of the RF circuit.09-08-2011
20090015323Balanced amplifier with protection circuit - According to an exemplary embodiment, a balanced amplifier includes an in-phase amplifier coupled to a first input port of an output coupler and a quadrature amplifier coupled to a second input port of the output coupler. The balanced amplifier further includes an impedance termination coupled to an isolated port of the output coupler. The balanced amplifier further includes a protection circuit coupled to the isolated port of the output coupler and configured to limit an amount of power applied across the impedance termination. The balanced amplifier further includes an input coupler having a first output port coupled to an input of the in-phase amplifier and a second output port coupled to an input of the quadrature amplifier.01-15-2009
20110018629REFERENCE VOLTAGE SUPPLY CIRCUIT - A reference voltage supply circuit is provided. The reference voltage supply circuit includes a first amplifier for amplifying a first input voltage and a fed back first reference voltage, a second amplifier for amplifying a second input voltage and a fed back second reference voltage, a reference voltage generator for generating the first reference voltage and the second reference voltage according to output signals of the first and second amplifiers and feeding the first and second reference voltages back to the first and second amplifiers, and a glitch remover turned on/off according to an input pulse signal to conduct or cut off current flowing between a power supply terminal and the ground.01-27-2011
20110148518DYNAMIC RANGE IMPROVEMENTS OF LOAD MODULATED AMPLIFIERS - The present invention relates to methods and devices to control and operate the functionality of a power amplifier system (06-23-2011
20100007413ECG ELECTRODE CONTACT QUALITY MEASUREMENT SYSTEM - A system and method are provided for generating output signals indicative of contact quality of a plurality of electrodes coupled to a patient. A signal generator coupled to a reference electrode injects an alternating signal into the patient. A plurality of differential amplifiers, each coupled to a respective one of the plurality of electrodes to detect an input signal from the patient, are operable to output a respective output signal in response to a respective input signal. The output signal generated by the respective differential amplifier is indicative of contact quality for the respective electrode.01-14-2010
20090206926High Efficiency Amplifier - When an input signal level is small, the electrical length of a phase line 08-20-2009
20100289571APPARATUS AND METHOD FOR MAXIMIZING PERFORMANCE OF PEAKING AMPLIFIER IN DOHERTY AMPLIFIER - An apparatus and method for maximizing the performance of a peaking amplifier in a Doherty amplifier are provided. The apparatus includes a splitter, a carrier amplifier, an (N−1) number of peaking amplifiers, a Doherty combiner, and an output load. The splitter splits an input signal into an ‘N’ number of power signals. The carrier amplifier amplifies the signal provided from the splitter using a first Direct Current (DC) bias. The peaking amplifiers amplify the signals provided from the splitter using a second DC bias, which is lower than the first DC bias. When the carrier amplifier and the peaking amplifiers are all operating, the Doherty combiner forms a load impedance of the respective amplifiers such that the load impedance of the peaking amplifiers are less than the load impedance of the carrier amplifier. The output load outputs the signals amplified by the carrier amplifier and the peaking amplifiers.11-18-2010
20090102554Output Networks In Combination With LINC Technique - The present invention relates to balanced power amplifier network in combination with outphasing techniques such as Chireix. The object of the present invention is to provide a solution to the problem to combine balanced amplifiers like the current mode class D (CMCD) or class E/F with a LINC network. The main problem is that some power amplifiers have balanced output and the LINC network is single-ended so that a high power low loss transformer that works at several impedance levels is needed, which is hard to realize at cellular frequencies.04-23-2009
20090261900Apparatus for Coupling at Least One of a Plurality of Amplified Input Signals to an Output Terminal Using a Directional Coupler - An apparatus has an input terminal configured to receive an input signal, a network coupled to the input terminal and configured to provide a plurality of amplified input signals, and a directional coupler coupled to the network and configured to couple at least one of the plurality of amplified input signals to an output terminal.10-22-2009
20090261901DECADE BANDWIDTH PLANAR MMIC FOUR PORT TRANSFORMER - A wide bandwidth planar four port MMIC transformer is provided by input diplexers which divide up the incoming signal into a high band and a low band, with the resulting signals coupled to high band and low band four port transformers implemented in one embodiment using spiral inductors and coupled lines, the outputs of which are combined using two output diplexers to provide a decade bandwidth transformer.10-22-2009
20110204974APPARATUS FOR IMPROVING PERFORMANCE AT LOW POWER REGION IN A DOHERTY AMPLIFIER - A method and apparatus improve the performance of a carrier amplifier in a Doherty amplifier. The Doherty amplifier includes a power divider, a carrier amplifier, at least one peaking amplifier, offset lines, and a Doherty circuit. The power divider provides a power signal to each of the carrier amplifier and the at least one peaking amplifier. The carrier amplifier amplifies power of a signal inputted from the power divider. The at least one peaking amplifier amplifies power of a signal inputted from the power divider. The offset lines control a load impedance when the at least one peaking amplifier does not operate. When the at least one peaking amplifier does not operate, the Doherty circuit generates the load impedance of the carrier amplifier that is larger than twice a load impedance at the maximum output power of the carrier amplifier.08-25-2011
20110204973AMPLIFYING DEVICE AND SIGNAL PROCESSING METHOD BASED ON AMPLIFYING DEVICE - An amplifying device and a signal processing method based on an amplifying device are provided, capable of reducing performance requirements of modules and reducing design difficulty of the modules. The amplifying device includes at least one amplifying module, including two receiving paths, in which a first receiving path is configured to attenuate and amplify an input signal after the input signal is pre-amplified, and a second receiving path is configured to amplify the input signal when the input signal is not pre-amplified. The signal processing method based on the amplifying device is further provided. The amplifying device and the signal processing method may be applied in a communication network system.08-25-2011
20100201441AMPLIFYING DEVICE - The present invention concerns a composite amplifier and a method for controlling the amplitude of a composite amplifier in a node of a wireless communication system. The composite amplifier comprises a first amplifier and a second amplifier that are arranged to be connected via an output combiner network to a load. The method comprises decomposing an input signal into a first signal component and a second signal component. Further, the method comprises differentiating the amplitude on the first signal component from the amplitude on the second signal component. the differentiation is made such that the aggregated efficiency of the composite amplifier is increased. The present invention also concerns a radio transmission device comprising a composite amplifier.08-12-2010
20120293252Systems and Methods of RF Power Transmission, Modulation, and Amplification, Including Varying Weights of Control Signals - Embodiments of the present invention include a method and system for control of a multiple-input-single output (MISO) device. For example, the method includes determining a change in power output level from a first power output level to a second power output level of the MISO device. The method also includes varying one or more weights associated with respective one or more controls of the MISO device to cause the change in power output. The one or more controls can include one or more of (a) a phase control of one or more input signals to the MISO device, (b) a bias control of the MISO device, and (c) an amplitude control of the input signals to the MISO device11-22-2012
20120293251DOHERTY POWER AMPLIFIER AND IMPLEMENTATION METHOD THEREOF - A Doherty power amplifier and an implementation method thereof are disclosed. The Doherty power amplifier includes a carrier power amplifier circuit and a peak power amplifier circuit, wherein, the peak amplifier circuit is configured with a Radio Frequency (RF) switch for controlling turn-on of peak power amplifiers in the peak amplifier circuit; and a part or all of carrier power amplifiers in the carrier power amplifier circuit use GaN devices, and a part or all of the peak power amplifiers in the peak power amplifier circuit use LDMOS devices.11-22-2012
20080231358POWER AMPLIFIER CIRCUIT - In a third operation in an amplifier, in which first and second amplifier circuits amplify a input signal, a distribution circuit adjusts the power of the signal supplied to the first amplifier circuit to within a range in which the input power to the first amplifier circuit and the output power from the first amplifier are proportional to each other. In a linear operation, the power of the signal from the first amplifier circuit and input to the comparison circuit and the power of the signal from the second amplifier circuit and input to the comparison circuit are equal. The comparison circuit adjusts the gain or the saturated power of the second amplifier circuit on the basis of the difference between the signals from the first and second amplifier circuits and input to the comparison circuit, so that the input power to the second amplifier circuit and the output power from the second amplifier circuit are proportional to each other.09-25-2008
20120105149POWER AMPLIFIERS - Various aspects of the disclosure provide high power and high efficiency power amplifier systems that can be integrated on a chip using integrated circuit processes such as a standard CMOS and SiGe process. A power amplifier system is disclosed according to one aspect. The power amplifier system comprises a first power amplifier, a Wilkinson power splitter, second-stage amplifiers, and a Wilkinson power combiner. The first power amplifier pre-amplifies an RF input signal. The Wilkinson power splitter then splits the power of the amplified RF signal outputted by the first power amplifier among the second-stage amplifiers. Each of the second-stage amplifiers amplifies the respective RF signal from the Wilkinson power splitter. The Wilkinson power combiner then sums the powers of the amplified RF signals outputted by the second-stage amplifiers and outputs the resulting combined RF signal.05-03-2012
20130120061Doherty Amplifier Circuit - The present invention relates to an amplifier comprising a plurality of Doherty amplifier cells each Doherty amplifier cell comprising an input and an output respectively connected to an input and an output of the amplifier, a main amplifier stage, a peak amplifier stage and a signal combining circuit configured to combine signals from outputs of the main and peak amplifiers and provide a combined signal to the output of the Doherty amplifier cell. Each cell comprises a controllable splitter having an input connected to the input of the Doherty amplifier cell. The controllable splitter is configured to receive a splitter control signal and modify an amplitude and phase of a signal at the input of the Doherty amplifier cell in response to the splitter control signal.05-16-2013
20090184763APPARATUS AND METHOD FOR DIGITAL PRE-DISTORTION, SHARING FEEDBACK PATH IN A MULTIPLE ANTENNA WIRELESS COMMUNICATION SYSTEM - A multiple antenna wireless communication system using a DPD power amplifier and a method for controlling an amplitude of an input signal for a plurality of transmission paths of the DPD power amplifier are provided. The system includes a plurality of amplifiers, a plurality of couplers, a switch, a shared feedback path and a plurality of processors. The plurality of amplifiers amplifies an input signal directed to each of the transmission paths. The plurality of couplers couple amplified signals on respective transmission paths. The switch outputs at least one of the amplified signals coupled on the respective transmission paths. The shared feedback path provides the amplified signal output from the switch to a plurality of processors. The plurality of processors compare a feedback signal provided through the shared feedback path with the input signal and pre-distort the input signal such that the input signal and the amplified signal have a linear relation with each other.07-23-2009
20090128234TWO-PEAK-POWER-LEVEL CONTROL METHOD AND DEVICE FOR A PULSE-MODE AMPLIFIER - A device for controlling least two peak power levels for an amplifier operating in pulse mode, characterized in that it comprises at least the following elements: 05-21-2009
20090140804METHOD AND APPARATUS FOR IMPROVING THE PERFORMANCE OF MIMO WIRELESS SYSTEMS - Method and apparatus for efficiently providing DC power enhancement to power amplifiers each of which being arranged in a MIMO system, by suing an enhancement circuitry with a plurality of inputs and outputs. Each input has a corresponding DC enhancement output that is connected to a DC enhancement input of a power amplifier. The DC enhancement output becomes operative whenever the amplitude of the corresponding input signal exceeds a predetermined threshold. The envelope of a plurality of input signals is sampled by sampling circuitries and the sampled envelopes are fed into a summation circuitry, in which they are summed. Whenever one of the sampled envelopes exceeds the threshold, a DC enhancement power is simultaneously provided to all DC enhancement inputs of all power amplifiers.06-04-2009
20080238541SPATIALLY DISTRIBUTED AMPLIFIER CIRCUIT - An exemplary amplifier circuit includes a first group of spatially distributed final amplifier stages having a first configuration, and a second group of spatially distributed final amplifier stages having a second configuration different than the first configuration. Both groups share the same control node for their respective final amplifier stages, and both groups share the same amplifier output node. Each group is typically enabled at a time that the other is disabled. In certain embodiments incorporating a memory array, only one critical analog node must be routed throughout the memory array.10-02-2008
20090231032LINC amplifying device - An amplifying apparatus includes a splitting unit for splitting an input signal into a first split signal and a second split signal; phase-shifting unit for phase-shifting the first split signal and the second split signal, respectively; a first amplifying unit for amplifying a first phase-shifted signal and outputting the signal as a first output signal; a second amplifying unit for amplifying, in a substantially identical manner to the first amplifying unit, a second phase-shifted signal and outputting the signal as a second output signal; and a matching unit for matching the first output signal and the second output signal to a first transmission unit and a second transmission unit, respectively. The first transmission unit is for transmitting the first output signal from the matching unit to a load resistor, and the second transmission unit is for transmitting the second output signal from the matching unit to the load resistor.09-17-2009
20090195307MULTIPLE-PATH POWER AMPLIFIER - An amplifier circuit and method for amplifying a signal efficiently over a plurality of power ranges. The amplifier circuit including a strong amplifier which is efficient over a first power range and a weak amplifier which is efficient over a second power range. An impedance transformation circuit is used for generating a higher potential and providing increased efficiency when the second range of power is present. A circuit biases active the strong amplifier when the first power range of is present and biases active the weak amplifier when the second power range is present.08-06-2009
20090206928Enhanced doherty amplifier with asymmetrical semiconductors - The present disclosures an amplification unit which comprises a first amplifier and a second amplifier connected in parallel, the first amplifier and the second amplifier comprising semiconductor devices that are not the same amplifier design. The present application also discloses a signal input line connected to the first amplifier and the second amplifier. A signal output line is also disclosed which is connected to the first amplifier and the second amplifier.08-20-2009
20090212858Integrated Doherty type amplifier arrangement with high power efficiency - The present invention relates to an integrated Doherty type amplifier arrangement and an amplifying method for such an arrangement, wherein a lumped element hybrid power divider (08-27-2009
20110140774ONE-SIDED SWITCHING PULSE WIDTH MODULATION AMPLIFIERS - One-sided pulse width modulated (PWM) amplifiers are disclosed. An example amplifier includes an integrator to receive first and second analog signals, and to output a first amplified signal and a second amplified signal based on the first and second analog signals, a reference changer coupled to the integrator to determine whether a first amplitude is higher than a second amplitude based on the first and second analog signals, to selectively cause the integrator to apply a first resistance between a reference node and the first amplified signal and apply a second resistance between the reference node and the second amplified signal when the first amplitude is higher than the second amplitude, and to selectively cause the integrator to apply the second resistance between the reference node and the first amplified signal and apply the first resistance between the reference node and the second amplified signal when the second amplitude is higher than the first amplitude, and first and second comparators coupled to the integrator to receive the first and second amplified signals, to compare the first and second amplified signals to a reference signal, and to output first and second pulse width modulated signals having respective first and second pulse widths based on the comparisons between the first and second amplified signals and the reference signal.06-16-2011
20110140775COMBINED CELL DOHERTY POWER AMPLIFICATION APPARATUS AND METHOD - A Doherty power amplification apparatus and method using a combined cell are provided. The Doherty power amplification apparatus includes, a power splitter for splitting an input power, and outputting the split powers to a carrier amplification unit and (N−1) peaking amplification units, wherein the carrier amplification unit, including M carrier power amplifiers, for amplifying power output from the power splitter; the (N−1) peaking amplification units, each of which includes M peaking power amplifiers, for amplifying the respective split powers output from the power splitter, and a power combiner for combining a power amplified by the carrier amplification unit and the respective split powers amplified by the (N−1) peaking amplification units, and for outputting the combined power, wherein N represents an integer obtained by adding a number of the carrier amplification units and a number of the (N−1) peaking amplification units, and M represents an integer which is equal to or more than 1.06-16-2011
20100148862METHOD AND APPARATUS FOR ENHANCING PERFORMANCE OF DOHERTY POWER AMPLIFIER - An apparatus and method for enhancing performance of a Doherty power amplifier are provided. The method includes a signal separation unit for generating a first input signal serving as an input signal of a carrier power amplifier using an input signal and a second input signal serving as an input signal of a peaking power amplifier using the input signal, in which the first input signal is different from the second input signal.06-17-2010
20100148861METHOD OF FORMING A CHARGE PUMP CONTROLLER AND STRUCTURE THEREFOR - In one embodiment, an amplifier circuit is formed to minimize pop and click noise on the outputs of the amplifier circuit. The amplifier circuit is configured to place an output stage of the amplifier circuit in a high impedance state to minimize the pop and click noise. In another embodiment, the amplifier circuit is configured to couple the inputs of two amplifiers together to minimize the pop and click noise.06-17-2010
20100188147MULTI-WAY DOHERTY AMPLIFIER - An electronic circuit has a multi-way Doherty amplifier. The multi-way Doherty amplifier comprises a two-way Doherty amplifier with a main stage and a first peak stage that are integrated in a semiconductor device; and at least one further peak stage implemented with a discrete power transistor.07-29-2010
20100188146High Efficiency Power Amplifier Having Embedded Switching - A power amplifier includes at least one amplification path comprising at least a first amplification device and a second amplification device, where the first amplification device has a common control terminal to provide amplification when biased on and to prevent conduction of a signal through the amplification path when biased off.07-29-2010
20100259325PRESELECTOR AMPLIFIER - A preselector amplifier system and method including of various components is described. The various components may include a vector generator, an active power splitter, an active power combiner, or the like. The preselector amplifier may be integral to and/or coupled to a communications system. The communications system may be at least one of a transceiver, receiver and/or transmitter. The communications system may transmit radio frequency (RF) signals.10-14-2010
20110102079High efficiency linear amplifier - A high efficiency linear amplifier is disclosed. The amplifier comprises an input module having an input coupled to receive an input signal, a first output configured to provide a first signal component, and a second output configured to provide a second signal component. The amplifier also comprises a switching module having a switch input coupled to receive a switch signal, a first input coupled to the first output of the input module, a second input coupled to the second output of the input module, and at least a first output configured to provide a first composite signal. The amplifier further comprises an amplifier module having at least a first input coupled to the first output of the switching module and at least a first output, wherein the first and second signal components comprise constant envelope phase varying signals having different phase relationships and which correspond to the input signal, and wherein the first composite signal comprises temporally sequenced portions of the first and second signal components.05-05-2011
20100141337AMPLIFIER WITH PROGRAMMABLE OFF VOLTAGE - An amplifier with multiple stages and having improved reliability is described. The multiple amplifier stages are coupled in parallel and include at least one switchable amplifier stage. Each switchable amplifier stage may be operated in an on state or an off state and includes a gain transistor and a cascode transistor. The gain transistor amplifies an input signal and provides an amplified signal in the on state and is disabled in the off state. The cascode transistor buffers the amplified signal and provides an output signal in the on state and is disabled based on an off voltage in the off state. The off voltage may be greater than zero volts or may have one of multiple possible values. The off voltage may be generated based on an output signal level, e.g., may be set to different values for different ranges of output signal level.06-10-2010
20100219887RF POWER AMPLIFIER WITH LINEARITY CONTROL - A linear amplifier circuit includes a multi-stage power amplifier that can amplify an input signal to produce an output signal, and a gain feedback control circuit coupled with the output and the input of the multi-stage power amplifier. An adjacent-channel leakage feedback control circuit can detect the output signal at the output of the multi-stage power amplifier and reduce adjacent-channel leakage in the output signal over an output power range based on the detected output signal.09-02-2010
20090273398DOHERTY POWER AMPLIFIER - The present invention relates to a power amplifier; and, more particularly, to a Doherty power amplifier. The power amplifier includes at least one carrier amplifier; at least one peaking amplifier arranged in parallel with the carrier amplifier in such a manner that the carrier amplifier and the peaking amplifier collectively operate as a Doherty amplifier; a plurality of input matching circuits, at least one of which is respectively connected to an input ends of the carrier amplifier and the peaking amplifier; at least one impedance control circuit, each of which is connected to an output end of each carrier amplifier for controlling a load line impedance of the said each carrier amplifier; at least one output matching circuit directly or indirectly connected to output ends of the impedance control circuit and the peaking amplifier; and at least one first delay circuit for matching delays between the carrier amplifier and the peaking amplifier. The present invention provides an improved Doherty power amplifier capable of achieving a further miniaturization and integration while maintaining an advantage in terms of efficiency and linearity of a Doherty power amplifier by employing an improved output and input matching method, and capable of operating more similar to the ideal operation of a Doherty power amplifier by applying an improved input power division method thereto.11-05-2009
20090108930High power commutating multiple output amplifier system - An amplifier system includes a power divider for dividing an input RF signal into M RF signals of equal power and phase. The system has M low power selectable phase shifters each for phase shifting one of the M RF signals. M high power amplifiers are coupled to respective ones of the phase shifters. The system includes an M×N power distribution network having M input ports and N output ports, such as a Butler matrix. The M high power amplifiers are connected to a respective one of the M input ports of the distribution network. The phase of the M phase shifters may be adjusted to obtain a maximum output at the desired output with all the other outputs nulled.04-30-2009
20100295610CIRCUIT WITH A POWER AMPLIFIER AND AMPLIFICATION METHOD - In a power amplification circuit an output signal is generated by combining the power of a first and second signal that have been amplified separately. An input signal is received that indicates a desired amplitude and phase of the output signal. A controllable phase shift circuit adapts the phase of first and second signals dependent on the desired amplitude, so that, when the signals with the adapted phases are combined, the resulting output signal will have an envelope with the desired amplitude. A time dependent common mode phase shift is applied to both the first and second signal. A control circuit selects the time dependent common mode phase shift as a function of the desired amplitude of the output signal, to compensate for envelope amplitude dependence of a common phase shift introduced by the amplification.11-25-2010
20110121896LOGARITHMIC MEAN-SQUARE POWER DETECTOR WITH SERVO CONTROL LOOP - A variable gain amplifier includes a plurality of amplification elements arranged to generate amplified representations of an RF input signal at a plurality of nodes. A plurality of controllable response elements each have an input coupled to a different one of the nodes to receive a different one of the amplified representations of the RF input signal. A scale factor generator is coupled to each of the controllable response elements. The scale factor generator receives a gain control signal and generates scale factor signals for varying the response of each of the controllable response elements such that as the scale factor generator sweeps through a full range of the gain control signal, the response of each of the controllable response elements is, in succession, increased smoothly to a peak and thereafter decreased smoothly to a lower level to produce a scaled output. A summing element is coupled to the controllable response elements for combining the scaled outputs of the controllable response elements to generate an output of the variable gain amplifier having a given gain range.05-26-2011
20110037516MULTI-STAGE IMPEDANCE MATCHING - Exemplary techniques for performing impedance matching are described. In an exemplary embodiment, the apparatus may include an amplifier (e.g., a power amplifier) coupled to first and second matching circuits. The first matching circuit may include multiple stages coupled to a first node and may provide input impedance matching for the amplifier. The second matching circuit may include multiple stages coupled to a second node and may provide output impedance matching for the amplifier. At least one switch may be coupled between the first and second nodes and may bypass or select the amplifier. The first and second nodes may have a common impedance. The apparatus may further include a second amplifier coupled in parallel with the amplifier and further to the matching circuits. The second matching circuit may include a first input stage coupled to the amplifier, a second input stage coupled to the second amplifier, and a second stage coupled to the two input stages via switches.02-17-2011
20110043280LOW NOISE, LOW POWER INSTRUMENTATION AMPLIFIER - An instrumentation amplifier includes a pair of buffered operational amplifiers that accept a pair of input signals, and a differential operational amplifier that outputs an output signal indicative of a difference between the input signals. A low pass filter provides passive band limiting of the output signal. Each operational amplifier is implemented as a multi-path amplifier that includes a low frequency path and a high frequency path between an input and an output of the operational amplifier. Further, each multi-path amplifier includes a differential input transconductance stage within the low frequency path and a differential input transconductance stage within the high frequency path. Within each multi-path amplifier, the differential input transconductance stage of the high frequency path is noisier than, but consumes less power than, the differential input transconductance stage of the low frequency path. Each multi-path amplifier provides noise shaping that results in an increase in noise above a crossover frequency of the multi-path amplifier.02-24-2011
20110043281DYNAMICALLY ADJUSTABLE LOW NOISE, LOW POWER INSTRUMENTATION AMPLIFIER - A circuit in accordance with an embodiment of the present invention includes an instrumentation amplifier, a dynamically adjustable low pass filter, at least one monitor and a controller. The instrumentation amplifier includes a pair of buffered operational amplifiers that accept a pair of input signals, and a differential operational amplifier that outputs an output signal indicative of a difference between the pair of input signals. The dynamically adjustable low pass filter is configured to provide band limiting of the output signal at frequencies greater than a cutoff frequency. The monitor, or monitors, is/are configured to monitor a signal upstream of the instrumentation amplifier and/or a signal downstream of the instrumentation amplifier and output a monitor signal. The controller is configured to receive the monitor signal, or signals, and to dynamically adjust output voltage noise at frequencies greater than the crossover frequency of the multipath amplifiers and/or the cutoff frequency of the low pass filter based on the monitor signal, or signals.02-24-2011
20110241773Multi-Channel Radio Frequency Generator - A multi-channel radio frequency (RF) generator module includes N power amplifiers, M drivers, a power supply module, and a control module. The N power amplifiers generate N RF outputs, respectively. The M drivers drive the N power amplifiers based on M driver control signals, respectively. The power supply module receives alternating current (AC) input power and applies L rail voltages to the N power amplifiers based on L rail voltage setpoints, respectively. The control module sets the L rail voltage setpoints and the M driver control signals. N is an integer greater than one, L and M are integers greater than zero, and M and L are less than or equal to N.10-06-2011
20110018628DYNAMIC BIAS SUPPLY DEVICES - A dynamic bias supply device for multiple parallel power amplifiers, in which a plurality of parallel power amplifiers including a Doherty amplifier are connected in parallel, is provided. The dynamic bias supply device includes a plurality of switches respectively corresponding to each of the parallel power amplifiers. The dynamic bias supply device is used in a distributed manner as multiple distributed dynamic bias switching circuits for the multiple parallel power amplifiers. Accordingly, performance deterioration is not caused by an additional connection structure, and it is possible to achieve high efficiency and high linearity of the power amplifiers.01-27-2011
20110241774Versatile Audio Power Amplifier - An audio power amplifier includes a first and a second amplification unit, each including a switching voltage amplifier, an output filter, a current compensator, an inner current feedback loop feeding a measurement of current measured at the output inductor back to a summing input of the current compensator, a voltage compensator coupled to the summing input of the current compensator, and an outer voltage feedback loop. A controlled signal path provides the output of the voltage compensator of the first amplification unit to the current compensator of the second amplification unit. The first and second amplification units are operable with separate loads, in parallel driving a common load, or across a bridge-tied-load. A second pair of amplification units may be added and operated together with the first pair to drive a single speaker with a parallel pair of amplifiers on each side of a bridge-tied-load.10-06-2011
20100026388Balanced Amplifying Device Having a Bypass Branch - A balanced amplifier includes a bypass branch (02-04-2010
20110210786Doherty Amplifier with Input Network Optimized for MMIC - In a Doherty amplifier (09-01-2011
20090315622FEEDFORWARD AMPLIFIER AND CONTROL METHOD THEREOF - In a feedforward amplifier (12-24-2009
20110074503OPERATIONAL AMPLIFIER - Provided is an operational amplifier capable of correcting an offset voltage of an element to be connected to an input terminal. The operational amplifier includes a main amplifier and an offset correction amplifier, which include input terminals connected in common. The main amplifier includes: a first transconductance amplifier for measurement; a second transconductance amplifier for offset correction; and a first capacitor connected to an input terminal of the second transconductance amplifier. The offset correction amplifier includes: a third transconductance amplifier for measurement; a fourth transconductance amplifier for offset correction; and a second capacitor connected to one input terminal of the fourth transconductance amplifier. An offset voltage adjustment circuit is provided to another input terminal of the fourth transconductance amplifier included in the offset correction amplifier.03-31-2011
20110068865V-Band High-Power Transmitter With Integrated Power Combiner - A wireless communications system includes a first multiplexer distribution network fed by a radio frequency input; a plurality of multi-stage power amplifiers fed by the first multiplexer distribution network, wherein each one of the multi-stage power amplifiers includes: a pre-distortion linearizer fed from the first distribution network; a first combiner receiving input from the pre-distortion linearizer; a second combiner; a plurality of power amplifier cells fed by the first combiner and feeding the second combiner; and a second multiplexer distribution network, wherein the second multiplexer distribution network is fed by the second combiner and feeds a radio frequency output.03-24-2011
20120119829REPAIR AMPLIFICATION CIRCUIT AND METHOD FOR REPAIRING DATA LINE - A repair amplification circuit includes a controlling unit, a first operational amplifier, a second operational amplifier, a first switching unit, and a second switching unit. Under a detection mode, the controlling unit generates a detecting signal according to a testing signal transmitted by a unnecessary repair segment in a test picture. Under an operation mode, the controlling unit generates a switching signal according to a repair controlling signal related to the detecting signal. The first switching unit and the second switching unit are controlled by the switching signal, so as to transmit the driving signal to one of the first operational amplifier and the second operational amplifier, and to transmit a positive polarity repairing signal generated by the first operational amplifier or a negative polarity repairing signal generated by the second operational amplifier to a necessary repair segment.05-17-2012
20110025412AMPLIFIER - A amplifier that obtains an output by power combining, comprising: a distribution circuit that distributes an input signal into two signals; a first amplifier circuit that amplifies one of the two signals distributed by the distribution circuit and operates in class AB mode; a second amplifier circuit that amplifies the other of the two signals distributed by the distribution circuit and operates in class B or C mode; a lumped constant circuit that connects outputs of the first and second amplifier circuits; a first impedance transformation circuit connected to an output of the first amplifier circuit; a second impedance transformation circuit connected to an output of the second amplifier circuit, and a quarter wavelength impedance transformation circuit with one end thereof connected to a combining point of output sides of the first and second impedance transformation circuits and with the other end thereof connected to a load (FIG. 02-03-2011
20100295609Method and Apparatus for Providing Dynamic Multi-Stage Amplification in a Medical Device - Methods and apparatus for providing multi-stage signal amplification in a medical telemetry system are provided.11-25-2010
20100301933OUTPUT NETWORKS IN COMBINATION WITH LINC TECHNIQUE - The present invention relates to balanced power amplifier network in combination with outphasing techniques such as Chireix. The object of the present invention is to provide a solution to the problem to combine balanced amplifiers like the current mode class D (CMCD) or class E/F with a LINC network. The main problem is that some power amplifiers have balanced output and the LINC network is single-ended so that a high power low loss transformer that works at several impedance levels is needed, which is hard to realize at cellular frequencies.12-02-2010
20100264984System and Method for Over-Voltage Protection of a Power Amplifier - A system and method for over-voltage protection of a power amplifier is provided. A power amplifier is typically employed in a transmitter to amplify signals prior to transmission via a load; the load may include an antenna or a cable. As a result of an impedance mismatch between the power amplifier and its load, excess power from the power amplifier output fails to reach the load and must be dissipated by one or more transistors in the power amplifier. In severe impedance mismatch conditions, this dissipated power may damage or destroy the transistor(s). An automatic gain control (AGC) is provided for detecting a gain difference between the power amplifier and a replica power amplifier. A gain difference may signal an over-voltage situation. The AGC may be configured to adjust the gain of the power amplifier if a gain difference exists to prevent device damage.10-21-2010
20100259326ACTIVE FORWARD FEED AMPLIFIER - An exemplary embodiment of the feed forward amplifier replaces traditional distributed directional couplers, splitters, and delay lines. Moreover, an exemplary feed forward amplifier architecture combines active implementations of RF couplers, power splitters, and/or time delay elements in a novel fashion allowing for ultra-compact size and broadband performance. In an exemplary embodiment, a feed forward amplifier has a main amplifier path and an error amplifier path. The feed forward amplifier comprises a main amplifier in the main amplifier path, and at least one active vector generator in the error amplifier path. The at least one active vector generator is configured to adjust the phase and amplitude of an error amplifier path signal and an error amplifier is configured to receive the adjusted error amplifier path signal. Furthermore, the adjusted error amplifier path signal and an amplified signal are combined to form the output signal of the feed forward amplifier.10-14-2010
20080284509N-WAY DOHERTY DISTRIBUTED POWER AMPLIFIER - A power amplifier using N-way Doherty structure for extending the efficiency region over the high peak-to-average power ratio of the multiplexing modulated signals such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. In an embodiment, the present invention uses a dual-feed distributed structure to an N-way Doherty amplifier to improve the isolation between at least one main amplifier and at least one peaking amplifier and, and also to improve both gain and efficiency performance at high output back-off power. Hybrid couplers can be used at either or both of the input and output. In at least some implementations, circuit space is also conserved due to the integration of amplification, power splitting and combining.11-20-2008
20100289569Digital hybrid amplifier calibration and compensation method - Methods and hybrid matrix amplifiers are provided. In a method of calibrating a hybrid matrix amplifier of a wireless transceiver, a plurality of signal paths having a digital and an analog portion are toggled such that the analog portion of each of the plurality of signal paths is active only during a corresponding buffer capture interval of a calibration process. The signal paths carry signals to be transmitted by an antenna arrangement. Channel estimates for each of the plurality of signal paths are generated based only on sampling data collected during the corresponding buffer capture interval. The hybrid matrix amplifier is calibrated based on the generated channel estimates.11-18-2010
20110133833Systems and methods providing multi-path low noise amplifiers with seamless switching - Systems and methods which provide a multimode tuner architecture implementing direct frequency conversion are shown. Embodiments provide a highly integrated configuration wherein low noise amplifier, tuner, analog and digital channel filter, and analog demodulator functionality are provided in a single integrated circuit. A LNA of embodiments implements a multi-path configuration with seamless switching to provide desired gain control while meeting noise and linearity design parameters. Embodiments of the invention implement in-phase and quadrature (IQ) equalization and a multimode channelization filter architecture to facilitate the use of direct frequency conversion. Embodiments implement spur avoidance techniques for improving tuner system operation and output using a clock signal generation architecture in which a system clock, sampling clock frequencies, local oscillator (LO) reference clock frequencies, and/or the like are dynamically movable.06-09-2011
20110074504MULTI MODE POWER OUTPUT MODULE AND METHOD OF USE WITH AN RF SIGNAL AMPLIFICATION SYSTEM - A multi mode power output module for use with RF signal amplification system. The multi mode power output module includes at least two power sources; a multiple of output power circuits associated with each of the at least two power sources; a first switch to switch between the at least two power sources, where the first switch provides power from at least two power sources to the output power circuit to amplify an RF signal associated with a lowest power output level; and second switch to switch between an RF output and the multiple of output power circuits to select a output power circuit associated with one of the at least two power sources that is also connected to the RF output.03-31-2011
20110095818METHOD AND APPARATUS FOR ACCURATELY MEASURING CURRENTS USING ON CHIP SENSE RESISTORS - Systems and methods for managing process and temperature variations for on-chip sense resistors are disclosed. The system includes a circuit that can leverage a linear gm circuit in order to provide linear gains (positive gains and/or negative gains). The linearity of the circuit enables compensation for temperature and process variations across an entire range of current (positive to negative). A control signal is generated by using a linear gm amplifier and a replica resistor, which is substantially similar to the on chip resistor. The control signal is used to control the gain of a disparate linear gm amplifier within a compensation circuit, which provides an offset voltage to compensate for the variation in resistance of the on chip resistor.04-28-2011
20100141338Broadband power amplifier - A broadband power amplifier is embodied by realizing a substantially two-section output matching circuit or a substantially two-section input matching circuit using a quarter wave transformer itself as the input matching circuit or the output matching circuit. The broadband power amplifier is advantageous in view of integration and miniaturization due to the low characteristic impedance of the quarter wave transformer and enables both reduction of sizes of chips and circuits due to its simple circuit structure and reduction in cost due to the reduced number of passive devices.06-10-2010
20100225388POWER AMPLIFIER - A Doherty amplifier is provided with a clipping circuit for making signal power flow to ground if the signal power becomes equal to or higher than a predetermine value in order to prevent a carrier amplifier, which is a small amplifier, from being destroyed if the signal power is increased to a sevenfold to tenfold multiple of a ratio of the size of the carrier amplifier to that of a peak amplifier.09-09-2010
20110175677DISTRIBUTED DOHERTY POWER AMPLIFIER - Provided is a distributed Doherty power amplifier exhibiting high efficiency and linearity at a wide range of bandwidths, the distributed Doherty power amplifier including a first amplifier; a second amplifier, which is connected to the first amplifier in parallel; a first shifting unit, which is interconnected between the input of the first amplifier and the input of the second amplifier and inverses the phase of the input of the second amplifier; and a second shifting unit, which is interconnected between the output of the first amplifier and the output of the second amplifier and inverses the phase of the output of the second amplifier, wherein the first amplifier and the second amplifier are Doherty power amplifiers, and each of the Doherty power amplifiers includes a carrier amplifier and a peaking amplifier, which are connected in parallel.07-21-2011
20100060354AMPLIFICATION CIRCUIT - The present invention is aimed at realizing an amplifying circuit whose chip size is prevented from being significantly increased even if the number of compatible frequencies increases, and which has a wide dynamic range when it operates under a low voltage. The amplifying circuit includes a plurality of impedance converting circuits connected to each other by a switching circuit of a first type having a signal cutting-off function, a switching circuit of a second type connected to a path branched from an input side of the switching circuit of the first type, the switching circuit of the second type having a signal cutting-off function, amplifiers connected respectively to an output side of one of the impedance converting circuits in a final stage and to an output side of the switching circuit of the second type, and a control signal generating circuit for controlling connection/disconnection between said switching circuit of the first type and said switching circuit of the second type; wherein either one of the paths is selected to input a signal to one of the amplifiers.03-11-2010
20100026387INTEGRATED DOHERTY TYPE AMPLIFIER ARRANGEMENT WITH HIGH POWER EFFICIENCY - The present invention shows a Doherty type of amplifier arrangement comprising a plurality of parallel unit cells. Each unit cell is of relatively low power. Suitably it comprises a compensation circuit at the input of the main amplifier and peak amplifier stage.02-04-2010
20100019843Method For Controlling A Linear Amplifier And Power Amplifier Arrangement - The present invention relates to a method for controlling an amplifier unit having at least one drive signal input connection 01-28-2010
20100321107HIGH EFFICIENCY TRANSMITTER FOR WIRELESS COMMUNICATION - The present invention provides an amplifier for a wireless transmitter. In one embodiment, the amplifier includes a signal separator for decomposing an input signal into constant envelope signals and amplifier circuits for amplifying the constant envelope signals. The amplifier also includes a combiner for combining the amplified constant envelope signals to form an output signal that is an amplified representation of the input signal. Linear correction circuits are used to apply gain, phase, and/or delay correction to the constant envelope signals. The corrections are determined based upon a feedback portion of the output signal. Pre-distortion circuits are used to apply a non-linear pre-distortion to the constant envelope signals. The non-linear pre-distortion is determined based upon the feedback portion of the output signal.12-23-2010
20090115512DISTRIBUTED DOHERTY AMPLIFIERS - Doherty and distributed amplifier (DA) designs are combined to achieve, wideband amplifiers with high efficiency dynamic range. A modified Doherty amplifier includes a wideband phase shifter providing first and second outputs, a main amplifier coupled to the first output, an auxiliary amplifier coupled to the second output, and a wideband combining network combining the outputs in phase. A multi-stage DA has a main output and a termination port, and a phase delay module and transforming network allowing power at the termination port to be combined in phase with power at the main output. In one combination, one or more stages of the DA may comprise a Doherty amplifier. In another combination, a modified series-type Doherty amplifying system is achieved by cascading main and auxiliary DAs. In any combination, Doherty topology may include a bias control module.05-07-2009
20110156813POWER AMPLIFIER - There is provided a power amplifier that can maintain a constant gain by detecting a level of a signal being input and a level of a signal being output. A power amplifier according to an aspect of the invention may include: an amplification section having at least one amplification unit amplifying an input signal according to an adjustable gain to thereby output the amplified input signal; a detection section detecting signal levels of an input signal and an output signal of the amplification section; and a gain maintaining section controlling a bias power according to a detection result of the detection section so that a gain of the amplification section is maintained within a predetermined gain range.06-30-2011
20110156812MULTI-BAND, MULTI-MODE RF TRANSMIT AMPLIFIER SYSTEM WITH SEPARATE SIGNAL PATHS FOR LINEAR AND SATURATED OPERATION - A device includes: an input for receiving an RF input signal having a signal format selected among a plurality of signal formats, including at least one signal format to be linearly amplified, and at least another signal format be amplified in saturation; at least a first and a second output; a first amplification path from the input to the first output that includes a first amplifier that operates in a linear amplification mode with respect to the RF input signal; a second amplification path from the input port to the second output that includes the first amplifier, and a second amplifier that operates in saturated amplification with respect to the RF input signal; and a path selection device that selectively passes the RF input signal through the first amplification path or the second amplification path in response to the selected signal format of the RF input signal.06-30-2011
20120176195 Asymmetric Multilevel Outphasing Architecture For RF Amplifiers - A radio frequency (RF) circuit includes a power supply configured to generate a plurality of voltages, a plurality of power amplifiers, each having an RF output port and a power supply input port, a switch network having a plurality of input ports coupled to the power supply and a plurality of switch network output ports coupled to the power supply input ports of the plurality of power amplifiers, wherein the switch network is configured to output selected ones of the plurality of voltages from the plurality of switch network output ports, at least two of the switch network output port voltages capable of being different ones of the plurality of voltages, and an RF power combiner circuit having a plurality of input ports coupled to RF output ports of the plurality of power amplifiers and an output port at which is provided an output signal of the RF circuit.07-12-2012
20120176194APPARATUS AND METHOD FOR IMPROVING PERFORMANCE IN DOHERTY AMPLIFIER - An apparatus and an operating method of an asymmetric Doherty power amplifier. A Doherty power amplifier apparatus includes a power divider configured to provide a power signal to a carrier amplifier and a peaking amplifier. The apparatus also includes the carrier amplifier configured to amplify a power of the signal input from the power divider. The apparatus further includes the peaking amplifier configured to have a maximum output power magnitude different from the carrier amplifier and amplify the power of the signal input from the power divider. The apparatus still further includes at least two offset transmission lines disposed at ends of the carrier amplifier and the peaking amplifier and configured to regulate a load impedance. The apparatus also includes an output combiner configured to combine and output outputs of the carrier amplifier and the peaking amplifier of different sizes.07-12-2012
20120056669POWER AMPLIFIER DEVICE WITH REDUCED BULK - An amplification device with reduced bulk including at least one plate parallel to a plane XY and at least two amplifier modules mounted on the plate, each amplifier module including an amplifier element, an input connection waveguide, and an output connection waveguide oriented in one and the same direction X corresponding to a direction of longitudinal propagation, the amplifier element having an input and output axis oriented in a direction Y perpendicular to the direction of propagation X, wherein the input connection waveguides of the amplifier modules are distinct, have different lengths and are mounted in parallel to one another, the output connection waveguides of the amplifier modules are distinct, have different lengths and are mounted in parallel to one another, and the sum of the lengths of the input and output guides of one and the same amplifier module is identical for each amplifier module.03-08-2012
20080204134Power combiner - An embodiment of four-way binary power combiner consists of a first 1:1 transformer that combines a 50 ohm output impedance received from an output of a first power amplifier and a 50 ohm output impedance received from an output of second power amplifier to provide a 25 ohm first transformer output impedance at a first transformer output. A first 100 ohm difference resistor is connected between the first power amplifier output and the second amplifier output. The second 1:1 transformer combines a 50 ohm output impedance received from an output of a third power amplifier and a 50 ohm output impedance received from an output of a fourth power amplifier to provide a 25 ohm second transformer output impedance at a second transformer output. A second 100 ohm difference resistor is connected between the third power amplifier output and the fourth power amplifier output. A 50 ohm difference resistor is connected between the first transformer output and the second transformer output. A third transformer combines the 25 ohm first transformer output impedance and the 25 ohm second transformer output impedance to provide a 12.5 ohm output impedance at a third transformer output that is adapted for direct connection to a load.08-28-2008
20120007671APPARATUS FOR AUTOMATICALLY SEPARATING AND DETECTING NOISE RADIO WAVES - An output signal SHS is secondarily amplified by a high-frequency amplifier AMP01-12-2012
20120062318METHOD AND APPARATUS FOR TRANSFORMER POWER COMBINER AND DYNAMIC POWER CONTROL FOR OUTPHASING POWER AMPLIFIERS - A method, system, apparatus and article are described for optimizing transformer power combiners and for dynamically controlling power for outphasing power amplifiers. In some embodiments, for example, an apparatus may comprise one or more outphasing power amplifiers, one or more phase modulator modules coupled to and operative to dynamically control the one or more outphasing power amplifiers, and one or more power combiners coupled to and operative to combine outputs from the one or more outphasing power amplifiers, wherein the one or more power combiners comprise transformer power combiners arranged to combine outphasing signals using a primary inductor and differential signals using a secondary inductor. Other embodiments are described and claimed.03-15-2012
20120154033AMPLIFYING APPARATUS AND DISTORTION COMPENSATION METHOD - An amplifying apparatus includes: a plurality of amplifiers; a linear combiner receiving a plurality of leakage signals resulting from cross leakage between outputs of the plurality of amplifiers and performing a linear combination of level values of the plurality of leakage signals to generate a plurality of linear combination signals; and an output calculator calculating real level values of a plurality of output amplified signals of the amplifiers from level values of the linear combination signals.06-21-2012
20100308907Type of High-Performance DC Amplification Device for Bioelectrical Signal Collection - This invention relates to a high-performance DC amplifying device for bioelectrical signal collection, including the sequentially linked input protective/filter circuit, input buffer circuit, instrumentation amplification circuit, RC low-pass filter circuit, analog-digital conversion and peripheral circuit and CPU, as described as below: the input protective/filter circuit collects the bioelectrical signal and sends such signal to the input buffer circuit and then allows it pass through the instrumentation amplification circuit, RC low-pass filter circuit and analog-digital conversion and peripheral circuit in order. For such device, CPU controls the operation of analog-digital conversion and peripheral circuit. This invention converts the impedance of bioelectrical signal firstly and then applies the common-mode signal rejection to the amplified signal, with the high-frequency noise filtered; such signal is treated for the secondary amplification by the single-ended-to-differential operational amplifier—the noise and common-mode rejection ratio and other indicators of such signal after analog-digital conversion reach a very high level and the baseline is very stable; the dynamic range of signal input is large and it is not saturated easily. With fewer parts needed, the reliability of such device is enhanced.12-09-2010
20110084761Output Amplifier of Source Driver - An output amplifier includes an amplifier circuit, a driving stage circuit, an output stage circuit, a first unity gain buffer, and a second unity gain buffer. The amplifier circuit provides an inverted signal and a non-inverted signal, in which the amplifier circuit amplifies an input pixel signal to generate the inverted signal and the non-inverted signal. The output stage circuit passes a supply voltage or a ground voltage to the pixel circuit according to the inverted signal and the non-inverted signal. The driving stage circuit passes the supply voltage or the ground voltage to the pixel circuit. The first unity gain buffer enhances and passes the inverted signal from the amplifier circuit to the driving stage circuit. The second unity gain buffer passes and enhances the non-inverted signal from the amplifier circuit to the driving stage circuit.04-14-2011
20100194473POWER AMPLIFIER WITH RECONFIGURABLE DIRECT CURRENT COUPLING - Embodiments of circuits, systems, and methods relating to a power amplifier with a reconfigurable direct current coupling are disclosed. Other embodiments may be described and claimed.08-05-2010
20120154034DOHERTY AMPLIFIER SYSTEM AND TRANSMITTER USING THE SAME - According to an embodiment, a Doherty amplifier system has a first Doherty amplifier and a second Doherty amplifier. The first Doherty amplifier operates in a SISO communication mode and in a MIMO communication mode. The first Doherty amplifier comprises a first carrier amplifier and a first peak amplifier. The second Doherty amplifier operates in the MIMO communication mode but not operates in the SISO communication mode. The second Doherty amplifier comprises a second carrier amplifier and a second peak amplifier. A distance between the first carrier amplifier and the second carrier amplifier is less than any of a distance between any of the first carrier amplifier and the second peak amplifier and any of the first peak amplifier and the second peak amplifier. In the SISO communication mode, heat generated by the first Doherty amplifier is conducted to the second Doherty amplifier to warm up the second Doherty amplifier.06-21-2012
20110080215FINAL STAGE THREE-WAY POWER COMBINING AMPLIFYING CIRCUIT APPLIED TO POWER AMPLIFIER OF MOBILE COMMUNICATIONS BASE STATION SYSTEM - The invention relates to a final stage three-way power combining amplifying circuit applied to power amplifier of a mobile communications base station system. The circuit includes at least a first power divider, a power combiner, a Doherty amplifier and a Class AB amplifier, as well as some transmission lines and phase-shift lines. A first output port of the first power divider is connected to a first input port of the power combiner via a first phase-shift line and the Doherty amplifier by concatenating them with transmission lines. A second output port of the first power divider is connected to an input terminal of a Class AB amplifier via a transmission line, an output terminal of the Class AB amplifier is connected to a second input port of the power combiner via a microstrip line, and the output terminal of the power combiner outputs an amplified radio frequency signal. The invention can meet the requirements of both high efficiency and low cost. Meanwhile, the reliability and stability of the power amplifying circuit are also ensured.04-07-2011
20120119830MODULE FOR MODULATION AND AMPLIFICATION - The present application relates to a module comprising at least two amplifiers. The first amplifier is configured to amplify an inphase signal. The second amplifier is configured to amplify a quadrature signal. The module comprises a combiner configured to combine the at least two amplified signals. The module comprises a phase reversal unit configured to provide at least two amplified signals comprising a maximum phase difference of 2 p.05-17-2012
20100289570AMPLIFIER CIRCUIT, ELECTRONIC DEVICE, METHOD FOR CONFIGURING AN AMPLIFIER CIRCUIT - An electronic circuit comprises one or more upstream stages and two or more downstream stages positioned, in a processing direction of the signals, downstream of the upstream stage. A plurality of configurable connections is present between the upstream stage and the downstream stages. The connections are configurable to provide a predetermined communication path between a respective upstream stage and one or more selected downstream stage selected from the two or more downstream stages and to communicatively disconnect the upstream stage from not selected downstream stages. The electronic circuit may for example be an amplifier circuit.11-18-2010
20100244950AMPLIFIER PRE-DISTORTION SYSTEMS AND METHODS - A method of optimizing performance of a multiple path amplifier includes: splitting an input signal to derive a respective sub-signal for each branch of the multiple path amplifier; independently pre-distorting each sub-signal using a known performance characteristic of its associated branch of the multiple path amplifier; and supplying each pre-distorted sub-signal to its associated branch of the multiple amplifier.09-30-2010
20100244949Composite Amplifier, a Radio Terminal and a Method for Improving the Efficiency of the Composite Amplifier - The present invention relates to a composite amplifier (09-30-2010
20100244948MULTIPLE-INPUT AND MULTIPLE-OUTPUT AMPLIFIER USING MUTUAL INDUCTION IN THE FEEDBACK NETWORK - The invention relates to an amplifier capable of producing a plurality of output signals, these output signals being controlled by a plurality of input signals. A multiple-input and multiple-output amplifier of the invention comprises includes 4 signal input terminals, 4 signal output terminals, 4 active sub-circuits and a feedback network. Each active sub-circuit has a sub-circuit input terminals connected to one of the signal input terminals, a sub-circuit output terminal connected to one of the signal output terminals and a sub-circuit common terminal. The feedback network uses mutual induction between windings. The feedback network has terminals connected to the sub-circuit common terminal of the active sub-circuits. The feedback network presents an impedance matrix producing a negative feedback such that the transfer admittance matrix of the multiple-input and multiple-output amplifier approximates a given admittance matrix.09-30-2010
20120126890POWER AMPLIFIER - The invention relates to improving the performance of load modulation power amplifiers through the use of coupled transmission line-based power combiners. Exemplary embodiments disclosed include a power amplifier comprising an input connected to first and second amplifier stages and an output stage configured to combine phase shifted amplified outputs from the first and second amplifier stages and to provide an amplified signal at an output of the power amplifier, wherein the output stage comprises coupled first and second transmission lines connected between the output of the first amplifier stage and an output load connection.05-24-2012
20120126891POWER AMPLIFICATION APPARATUS - A power amplification apparatus includes a first amplifier turned on at a preset low input power; and a second amplifier connected in parallel with the first amplifier and turned off at a low input power due to a relatively low bias current. Output capacitors of the first amplifier and the second amplifier are compensated for by inductors or microstrip lines of dc power supply paths. An output matching circuit of the first amplifier includes a λ/4 transformer. An output matching circuit of the second amplifier has the phase of 0°. Input matching circuits of the first amplifier and the second amplifier include delay compensation circuits. The output matching circuit of the first amplifier, the output matching circuit of the second amplifier, and a final output matching circuit have the same impedance transformation rates.05-24-2012
20110181353TWO-CHANNEL OPERATIONAL AMPLIFIER CIRCUIT - A two-channel operational amplifier circuit includes a first operational amplifier and a second operational amplifier. In a first frame period, the two-channel operational amplifier circuit switches a first input stage, a first gain stage and a first output stage to work between a working voltage and a half working voltage, and switches a second input stage, a second gain stage and a second output stage to work between the half working voltage and a ground voltage. In a second frame period, the two-channel operational amplifier circuit switches the second input stage and the second gain stage to work between the working voltage and the half working voltage, and switches the first input stage and the first gain stage to work between the half working voltage and the ground voltage.07-28-2011
20120212292MODIFIED DYNAMIC LOAD SCALING (MDLS) TECHNIQUE FOR IMPLEMENTING HIGH EFFICIENCY LOW POWER MODE OPERATION - A power amplification circuit having three modes of operation and a single switch is disclosed. Only one switch is used to control three different load impedance levels, one load impedance level for each mode of operation. The remaining “switching” results from selectively biasing each power amplification path by turning ON or OFF amplifiers. A series L-C and a switch are used to control the load impedance. Additional modes of operation may also be created without requiring any additional switch. Further, multiple modes of operation may be implemented using no switches.08-23-2012
20120075018POWER AMPLIFIER AND TRANSMITTER - A power amplifier is provided, which includes a power dividing unit, a first power amplification tributary, a second power amplification tributary, and an impedance conversion unit. Input ends of the first power amplification tributary and the second power amplification tributary are coupled to two output ends of the power dividing unit respectively. An output end of the first power amplification tributary is coupled to an output end of the second power amplification tributary through the impedance conversion unit. Rated power of a peak power amplifier in the second power amplification tributary is greater than that of a main power amplifier in the first power amplification tributary. The beneficial effects of the present invention lie in that larger back-off exists at the peak of an efficiency curve of the power amplifier, and in the case that power is back-off, efficiency of the power amplifier is improved.03-29-2012
20120075017ATTENUATOR - An attenuator includes a first 3 dB bridge, a second 3 dB bridge and an amplifying tube group, where the amplifying tube group includes a first amplifying tube and a second amplifying tube, a drain of the first amplifying tube is connected to a first output port of the first 3 dB bridge, a source of the first amplifying tube is connected to a first input port of the second 3 dB bridge, a drain of the second amplifying tube is connected to a second output port of the first 3 dB bridge, and a source of the second amplifying tube is connected to a second input port of the second 3 dB bridge; where gates of the first amplifying tube and the second amplifying tube are respectively connected to the same voltage source or different voltage sources having the same voltage.03-29-2012
20120313700Predistorter For A Multi-Antenna Transmitter - Methods and apparatus are disclosed for predistorting input data signals to a MIMO transmitter to compensate for distortions introduced by the MIMO transmitter. Distortions introduced to data signals by a MIMO transmitter include crosstalk between multiple transmit paths and non-linearities introduced by power amplifiers. In an exemplary predistorter, post-amplifier crosstalk is compensated for by a first matrix operation before distortions introduced by power amplifiers are predistorted by power amplifier predistorters. After the power amplifier predistorters, pre-amplifier crosstalk is compensated for by a second matrix operation.12-13-2012
20120223775DOHERTY AMPLIFIER - The embodiment relates to a Doherty amplifier, wherein in order to perform impedance matching. The embodiment comprises an impedance converter and a connector. The impedance converter includes a plurality of lines having different lengths and disposes between an output end of a carrier amplifier and an output end of a peaking amplifier. The connector connects a line selected from the plurality of lines having different lengths of the impedance converter to the output end of the carrier amplifier and to the output end of the peaking amplifier.09-06-2012
20090021301Efficient Composite Amplifier - A detuned composite amplifier includes a nonlinear drive function (01-22-2009
20120299644SYSTEM AND A METHOD FOR AMPLIFYING A SIGNAL BY MULTIPLE NON-LINEAR POWER AMPLIFIERS - A system and a method are provided. The system may include (A) a measurement circuit arranged to measure at least a current power level of the input signal; (B) multiple non-linear power amplifiers; wherein different non-linear power amplifiers are associated with different power ranges; (C) a control circuit arranged to: (a) select at least one selected non-linear power amplifier to be used to amplify a second signal based on at least: (i) the current power level of an input signal; (ii) an association between the different power ranges and the different non-linear power amplifiers; (iii) an identity of at least one previously selected non-linear power amplifier; and (b) assist in an activation of the at least one selected non-linear power amplifier; and (D) a signal processing module, configured to process the input signal to provide the second signal such as to at least partially compensate for a non-linearity of each of the at least one selected non-linear power amplifier.11-29-2012
20120229207PULSE WIDTH MODULATION SIGNAL GENERATING CIRCUIT AND AMPLIFIER CIRCUIT WITH BEAT FREQUENCY CANCELLATION CIRCUIT - A beat frequency cancellation circuit, for an amplifier, includes a coupling device connected between two signal processing paths of the amplifier for compensating for beat frequency effects of output signals between the signal processing paths.09-13-2012
20100327970Transmission Line Distributed Oscillator - In one embodiment, an integrated circuit antenna array includes: a substrate, a plurality of antennas adjacent the substrate; and an RF network adjacent the substrate, the RF feed network coupling to a distributed plurality of amplifiers integrated with the substrate, wherein the RF feed network and the distributed plurality of amplifiers are configured to form a resonant network such that if a timing signal is injected into an input port of the RF network, the resonant network oscillates to provide a globally synchronized RF signal to each of the antennas.12-30-2010
20100327969POWER AMPLIFIER HAVING PARALLEL AMPLIFICATION STAGES AND ASSOCIATED IMPEDANCE MATCHING NETWORKS - An amplification device includes a series combination of a driver stage, an output terminal matching network, and a secondary amplification stage. The driver stage includes a driver amplifier and an output matching network. The secondary amplification stage includes a parallel combination of an impedance transformation network and a main amplification stage. The main amplification stage includes a plurality of main amplification branches in parallel with each other, and an input matching network in series with the parallel combination. Each main amplification branch includes a main amplifier, and input and output impedance matching networks. A control circuit supplies activation signals to the main amplification branches to selectively turn them on and off. The device has no switches in the path of the signal that is amplified. In at least one operating mode, the control circuit turns on at least two of the main amplification branches at the same time.12-30-2010
20080297245DELAY MODULATOR PRE-DISTORTION CIRCUIT FOR AN AMPLIFIER - A circuit for pre-distorting a signal input to an amplifier includes a signal divider operable for dividing an input signal into signal portions that travel in a primary path and a secondary path. A delay element in each of the primary and secondary paths introduces a group delay to the signal portions in the respective paths. A signal combiner is operable for combining the signals in the respective paths into a combined output signal. A variable gain circuit is arranged in each of the primary and secondary paths. The variable gain circuit is operable to vary the level of the input signal in each path and thereby modulate the overall phase delay of the combined output signal.12-04-2008
20120319772FLEXIBLE MULTI-CHANNEL AMPLIFIERS VIA WAVEFRONT MUXING TECHNIQUES - This invention aims to present a smart and dynamic power amplifier module that features both power combining and power sharing capabilities. The proposed flexible power amplifier (PA) module consists of a pre-processor, N PAs, and a post-processor. The pre-processor is an M-to-N wavefront (WF) multiplexer (muxer), while the post processor is a N-to-M WF de-multiplexer (demuxer), where N≧M≧2. Multiple independent signals can be concurrently amplified by a proposed multi-channel PA module with a fixed total power output, while individual signal channel outputs feature different power intensities with no signal couplings among the individual signals. In addition to basic configurations, some modules can be configured to feature both functions of parallel power amplifiers and also as M-to-M switches. Other programmable features include configurations of power combining and power redistribution functions with a prescribed amplitude and phase distributions, as well as high power PA with a linearizer.12-20-2012
20120326780COUPLER AND AMPLIFIER ARRANGEMENT - A coupler comprises a first line (12-27-2012
20120286860Systems and Methods for Minimizing Phase Deviation and/or Amplitude Modulation (AM)-to-Phase Modulation (PM) Conversion for Dynamic Range, Radio Frequency (RF) Non-Linear Amplifiers - Embodiments of the invention may provide systems and methods for minimizing phase deviation and/or amplitude modulation (AM)-to-phase modulation (PM) conversion for dynamic range, radio frequency (RF) non-linear amplifiers. In order to provide high dynamic range with reduced phase error, embodiments of the invention may utilize two separate paths for processing a signal. In particular, an input signal may be sampled and divided into each path. The first signal path may be used to shape a signal, and in particular, a voltage waveform at the load. The second signal path may be used for generating negative capacitances corresponding to the voltage waveform at the load. By combining the two signals at the load, a high-dynamic range, high-frequency, non-linear amplifier can be achieved that reduces phase error resulting from amplitude fluctuations with a relatively low unity-gain frequency (f11-15-2012
20130021095Power-Amplifier Arrangement - A power-amplifier arrangement (01-24-2013
20130021094CIRCUIT FOR OPTIMIZING A POWER MANAGEMENT SYSTEM DURING VARYING LOAD CONDITIONS - A circuit for optimizing a power management system. The circuit includes a first amplifier. The first amplifier is responsive to a first reference signal and operable to supply a first load current. The circuit also includes a second amplifier coupled to the first amplifier. The second amplifier is responsive to a second reference signal and operable to supply a second load current. The second load current is lower in magnitude than the first load current, thereby enabling the first amplifier to operate during a first load condition, and the second amplifier to operate during the first load condition and a second load condition. Further, the circuit includes a resistive element coupled to the first amplifier and the second amplifier, to isolate the first amplifier from the second amplifier.01-24-2013
20130135044HIGH-FREQUENCY POWER AMPLIFIER WITH DOHERTY EXTENSION - A high-frequency power amplifier comprises a broadband amplifier (05-30-2013
20130113554SIGNAL SPLITTING APPARATUS SUITABLE FOR USE IN A POWER AMPLIFIER - Disclosed is a signal splitting apparatus useable in a power amplifier having two or more power amplifiers. The apparatus includes a direct gain component; and a derived gain component connected to the direct gain component. The derived gain component derives the derived gain from the direct gain by imposing a constraint which is valid over the entire dynamic range of the input signal, e.g. the sum of the power of the direct split signal and the derived split signal are constrained to be substantially equal to the power of the input signal. The use of combining additional direct gain and derived gain components, as well as a delay element, are disclosed so as to enable n-component splitting that for adaptation to different applications by the use of suitable coefficients.05-09-2013
20130127529AUTOMATIC GAIN CONTROL DEVICE - A first frequency converter generates an I-system baseband signal based on a high-frequency received signal and a first local signal with a predetermined frequency band. A second frequency converter generates a Q-system baseband signal based on a high-frequency received signal and a second local signal 90° out of phase with the first local signal. First and second AD converters convert respective amplified I-system and Q-system baseband signals to digital data. First and second over-range detecters detect the over-range of the first and the second CAD converters. An automatic gain controller selects the gain based on the detection information of the over-range and the respective I-system and Q-system baseband signals. An offset setter gives a predetermined offset to the selected gain, and sets a gain after the offset with respect to the first or the second variable amplifier.05-23-2013
20130127528POWER AMPLIFIER AND AMPLIFICATION METHOD THEREOF - Provided are a power amplifier and a method thereof. The power amplifier power amplifier includes: a main amplifying unit receiving power; an auxiliary amplifying unit connected in parallel to the main amplifying unit; and a balloon transformer combined with the main amplifying unit and the auxiliary amplifying unit. Respectively different bias voltages are applied to the main amplifying unit and the auxiliary amplifying unit.05-23-2013
20130135043MULTIMODE RF AMPLIFIER SYSTEM - Multimode radio frequency (RF) amplifier systems and techniques are disclosed. In one embodiment, a multimode radio frequency (RF) amplifier system has a first RF amplifier and a second RF amplifier. The first RF amplifier may support a first RF communication standard. The second RF amplifier may support a second RF communication standard. The first RF amplifier includes an auxiliary circuit. The auxiliary circuit may provide a service or a utility to a second RF amplifier. For example, the auxiliary circuit may generate a supply voltage to power the second RF amplifier.05-30-2013
20080197923SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE AND HIGH-FREQUENCY POWER AMPLIFIER MODULE - Upon application of an on-state voltage to a control terminal, an antenna switch provided between an antenna terminal and a transmission terminal is turned on, and a transmission signal of a PCS/DCS system passes from the transmission terminal through the antenna terminal. At this time, a booster circuit, to which a part of the transmission signal is supplied, generates at an output terminal a boost voltage higher than a control voltage output from a controller due to the rectification of diodes, and applies the same to the gate of a transistor circuit of the antenna switch. Since in the booster circuit a resistor is coupled to the output terminal, the passage through resistors of an input transmission power in an RF signal path is only the passage through one resistor, thus reducing the attenuation of the transmission signal and providing an excellent insertion loss characteristic.08-21-2008
20080197922AMPLIFIER DEVICE FOR AN ANTENNA OPERABLE IN AT LEAST ONE MODE - An amplifier device for a mode antenna has a number of amplifiers and a number of outputs. An input signal is fed to each amplifier, which is amplified by the respective amplifier into an amplified input signal. The amplified input signals are fed to an output matrix arranged after the amplifiers. Respective output signals are emitted by the output matrix at the outputs. The output matrix causes each amplified input signal to supply an output signal contribution for each output signal. Each output signal contribution of each output signal has an output-side contribution offset in relation to the corresponding amplified input signal, which depends on the amplified input signal that supplied the output signal contribution, and the output signal to which the output signal contribution contributes. The amplifier device is especially able to be used in a transmit arrangement for radio-frequency signals.08-21-2008
20130147549AMPLIFIER - An amplifier includes a signal processing circuit configured to generate an orthogonal signal orthogonal to an input signal; a first D/A converter configured to convert the orthogonal signal into a first analog signal; a second D/A converter configured to convert the input signal into a second analog signal; and an analog computing circuit configured to generate a constant envelope signal based on the first analog signal from the first D/A converter and the second analog signal from the second D/A converter.06-13-2013
20130043944CASCADED CONVERGED POWER AMPLIFIER - A first radio frequency (RF) power amplifier (PA) stage, a second RF PA stage, and an alpha RF switch are disclosed. The first RF PA stage provides a first RF output signal. During a first alpha mode, the alpha RF switch forwards the first RF output signal to the second RF PA stage, such that the first RF PA stage functions as a driver stage and the second RF PA stage functions as a final stage. However, during one of a group of alpha modes, the alpha RF switch forwards the first RF output signal to provide a corresponding one of a group of alpha transmit signals, such that the first RF PA stage functions as a final stage. Further, the first alpha mode is not one of the group of alpha modes.02-21-2013
20130099860HIGH FREQUENCY POWER AMPLIFIER - A Doherty amplifier includes an impedance transformer located between a load and a signal combining point of a carrier amplifier and a peak amplifier. The impedance transformer subjects, at frequencies including a fundamental frequency and at least a second harmonic frequency thereof, an impedance Zo of the load to impedance transformation into a value lower than Zo, for example, (½)×Zo, over a wide band or a plurality of frequency bands.04-25-2013
201003151623-WAY DOHERTY AMPLIFIER WITH MINIMUM OUTPUT NETWORK - A 3-way Doherty amplifier has an amplifier input and an amplifier output. The amplifier has a main stage, a first peak stage and a second peak stage. The amplifier has an input network connecting the amplifier input to the inputs of the stages, and an output network connecting the stages to the amplifier output. The output network implements a phase shift of 90° between the output of the main stage and the amplifier output; a phase shift of 180° between the output of the first peak stage and the amplifier output; and a phase shift of 90° between the third output and the amplifier output.12-16-2010
20100315161Power Inductor - A power inductor comprising a tube and one or more coils. The tube in one embodiment is generally cylindrical and comprises a liquid-cooled center portion, the tube further comprising an inner diameter, an outer diameter, and an outer surface. The coils of one embodiment are coupled to the tube outer surface, with each of the one or more coils having a coil thickness, and at least a portion of a coil turn.12-16-2010
20120280748MULTI-PORT AMPLIFICATION DEVICE THAT SELF-COMPENSATES IN THE PRESENCE OF TRAFFIC - A system for multi-distributed amplification of a communication signal including at least one plurality N of input pathways connected to an input Butler matrix which delivers as output N distributed signals, a plurality N of tube amplifiers which receive as input said distributed signals and produce as output N amplified and phase-shifted signals each of a complex gain Gi and an output Butler matrix which receives as input said amplified signals and produces as output N output signals, wherein the phase error and amplitude error are self-compensated in the presence of traffic.11-08-2012
20120280747FEEDBACK BASED BUCK TIMING OF A DIRECT CURRENT (DC)-DC CONVERTER - At least a first shunt switching element and switching control circuitry of a first switching power supply are disclosed. At least the first shunt switching element is coupled between a ground and an output inductance node of the first switching power supply. The first switching power supply provides a buck output signal from the output inductance node. The switching control circuitry selects one of an ON state and an OFF state of the first shunt switching element. When the buck output signal is above a first threshold, the switching control circuitry is inhibited from selecting the ON state. The first switching power supply provides a first switching power supply output signal based on the buck output signal. By using feedback based on the buck output signal, the switching control circuitry may refine the timing of switching between series switching elements and shunt switching elements to increase efficiency.11-08-2012
20120280746DC-DC CONVERTER SEMICONDUCTOR DIE STRUCTURE - A direct current (DC)-DC converter having a DC-DC converter semiconductor die and an alpha flying capacitive element is disclosed. The DC-DC converter semiconductor die includes a first series alpha switching element, a second series alpha switching element, a first alpha flying capacitor connection node, which is about over the second series alpha switching element, and a second alpha flying capacitor connection node, which is about over the first series alpha switching element. The alpha flying capacitive element is electrically coupled between the first alpha flying capacitor connection node and the second alpha flying capacitor connection node. By locating the first alpha flying capacitor connection node and the second alpha flying capacitor connection node about over the second series alpha switching element and the first series alpha switching element, respectively, lengths of transient current paths may be minimized, thereby reducing noise and potential interference.11-08-2012
20130154731N WAY DOHERTY AMPLIFIER - A device including a Doherty amplifier, the Doherty amplifier having an amplifier input and output. At least one main amplifier is coupled to the input via a main input impedance and to the output via a main output impedance and additional amplifiers, each amplifier being coupled to the input via respective additional input impedances. Each additional amplifier has a respective additional amplifier output coupled to a respective pair of additional impedances connected in series and having a respective connection node between them. The device also has a first additional amplifier having their respective additional impedances coupled between its respective output and the amplifier output, the pair of additional impedances having first and second impedances, the first impedance being connected to the respective additional amplifier output and to the connection node, the second impedance being coupled between their respective connection node and the connection node of the previous additional amplifier.06-20-2013
20130154730USING A NEW SYNCHRONIZATION SCHEME FOR A MULTI-CHANNEL CLASS-D AMPLIFIER - Various embodiments are described herein for a multi-channel class-D amplifier and an associated processing method. In general, the multi-channel class-D amplifier comprises a signal source that provides a plurality of input signals and generates synchronization information; and a plurality of class-D amplifier channel modules, each class-D amplifier channel module being configured to process a corresponding input signal from the plurality of input signals according to the synchronization information to produce an output signal. The switching frequencies employed by the plurality of class-D amplifier channel modules are substantially similar to one another and the processing of the plurality of input signals is offset in time across the plurality of class-D amplifier channel modules.06-20-2013
20130181773MULTI-WAY DOHERTY AMPLIFIER - The present disclosure provides a multi-way Doherty amplifier that includes an amplifier input, an amplifier output, a main amplifier having an input connected to the amplifier input, and at least a first and a second peak amplifier. In the Doherty amplifier, an input of the first peak amplifier is connected to the amplifier input or an output of the main amplifier, and an input of the second peak amplifier is connected to the amplifier input, the output of the main amplifier or an output of the first peak amplifier. The Doherty amplifier further comprises a first impedance converter connected between the output of the main amplifier and the amplifier output, a second impedance converter connected between the output of the first peak amplifier and an output of the second peak amplifier, and a third impedance converter connected between the output of the second peak amplifier and the amplifier output.07-18-2013
20120286861Doherty Amplifier and Method for Operation Thereof - An amplifier having a Doherty-type architecture and a method for operation thereof are provided. The amplifier comprises a main amplifier path comprising a main amplifier, an auxiliary amplifier path comprising an auxiliary amplifier, and an signal preparation unit configured to develop a main amplifier input signal for the main amplifier path and an auxiliary amplifier input signal for the auxiliary amplifier path based on an amplifier input that is to be amplified and a transition threshold associated with the amplifier input. By driving the main and auxiliary amplifiers as a function of the transition threshold, the gain of the Doherty-type amplifier may be increased.11-15-2012
20120013400Current Control Circuit, Class AB Operational Amplifier System and Current Control Method - A current control circuit for controlling a bias current of a class AB operational amplifier includes: a low current source, for generating a low bias current; a high current source, for generating a high bias current, which is greater than the low bias current; and a comparing and selecting unit, coupled to an output terminal of the class AB operational amplifier, for selecting one of the low bias current and the high bias current to output as the bias current according to an output voltage of the class AB OP.01-19-2012
20130093511APPARATUS AND METHOD FOR IMPROVING EFFICIENCY IN POWER AMPLIFIER - An apparatus and method for enhancing the whole efficiency of power amplification in a supply modulated amplifier are provided. The power amplification apparatus includes a controller, a Doherty power amplifier, and a supply modulated amplifier. The controller selects a power amplifier among the Doherty power amplifier and the supply modulated amplifier. The Doherty power amplifier amplifies a power of a transmission signal when the Doherty power amplifier is selected by the controller. The supply modulated amplifier amplifies the power of the transmission signal using a supply voltage determined considering the amplitude of the transmission signal, when the supply modulated amplifier is selected by the controller.04-18-2013
20120235734ENHANCED DOHERTY AMPLIFIER - The disclosure relates to an enhanced Doherty amplifier that provides significant performance improvements over conventional Doherty amplifiers. The enhanced Doherty amplifier includes a power splitter, combining node, a carrier path, and a peaking path. The power splitter is configured to receive an input signal and split the input signal into a carrier signal provided at a carrier splitter output and a peaking signal provided at a peaking splitter output. The carrier path includes carrier power amplifier circuitry, a carrier input network coupled between the carrier splitter output and the carrier power amplifier circuitry, and a carrier output network coupled between the carrier power amplifier circuitry and the Doherty combining node. The peaking path includes peaking power amplifier circuitry, a peaking input network coupled between the peaking splitter output and the peaking power amplifier circuitry, and a carrier output network coupled between the power amplifier circuitry and the Doherty combining node.09-20-2012
20120112832RADIO FREQUENCY SWITCH AND RADIO FREQUENCY MODULE - The present invention provides a radio frequency switch and a radio frequency module having excellent distortion characteristics without causing a further insertion loss and a greater chip size. The radio frequency switch includes: input-output terminals which are for inputting and outputting a radio frequency signal; a basic switching unit provided between two of the input-output terminals; and a control terminal which receives a control voltage for controlling conduction and interruption of the basic switching unit. The basic switching unit includes field effect transistors (FETs) connected in multiple stages, each of the FETs being a meandered FET having a meandered gate electrode, and among the FETs, one of the FETs has a finger length shorter than finger lengths of rest of the FETs, the one of the FETs electrically located closest to one of the input-output terminals.05-10-2012
20090066413Method and Apparatus for Diminishing Mismatch Effects Between Switched Signals - A circuit for diminishing mismatch effects between at least two switched signals includes at least three processing circuits configured to receive at least two switched signals such that each of the switched signals is associated with one of the processing circuits leaving at least one unassociated processing circuit. A controller circuit is configured to switch one of the switched signals to be associated with one of the unassociated processing circuit(s) upon at least one specified interval such as, for example, at a transition of the switched signal. The circuit may be incorporated into an audio amplifier configured to provide information carried on the switched signals to one or more speakers that provide an audio output. A one-processor circuit approach includes switching frames of a switched signal between positive and negative inputs of a processor circuit to average out errors introduced by the processor circuit.03-12-2009
20100214017TUNING MULTIPORT AMPLIFIERS - A method of tuning a multiport amplifier and a multiport amplifier are provided. The multiport amplifier comprises an even number of microwave power amplifiers arranged in parallel, a series of input ports and a series of output ports, the input ports being connected to the amplifiers by a series of input hybrids and the output ports being connected to the amplifiers by a series of output hybrids, whereby an input signal at any given input port is amplified by all amplifiers, and then recombined into an output signal at a given output port. The method includes the steps of matching each amplifier in a pair of adjacent amplifiers to the other to an extent which is greater than matching between non paired amplifiers while still being able to ensure acceptable signal isolation between all output ports. This method of tuning results in an MPA well suited to the requirements of certain frequency re-use schemes and which has a significantly reduced set-up and test time.08-26-2010
20100271121MULTIPORT AMPLIFIERS IN COMMUNICATIONS SATELLITES - In order to maintain isolation of signals within a multiport amplifier of a communications satellite and to reduce cross-talk components, by monitoring communications signals passing through the multiport amplifier, output signals of the multiport amplifier are sensed and downconverted to baseband, and applied to an emulator mechanism of the multiport amplifier. The emulator mechanism comprises a reverse matrix of the multiport amplifier, which recovers the input signals of the multiport amplifier together with cross-talk components, and a digital signal processor which carries out a frequency analysis of the cross-talk components by means of an EFT, and employs a digital model of the multiport amplifier to determine the state of the multiport amplifier which gives rise to such cross-talk components. The digital signal processor may be located at a ground station to which communication is made via a telemetry link.10-28-2010
Entries
DocumentTitleDate
20090206927Amplifier - There is provided an amplifier for combining outputs of a plurality of amplifying circuits to generate an amplifier output. The amplifier includes a first amplifying circuit for operating a first amplifying device in class-AB, wherein the first amplifying circuit is one among the plurality of the amplifying circuits; a second amplifying circuit for operating a second amplifying device in class-B or class-C, wherein the second amplifying circuit is one among the plurality of the amplifying circuits; and a summing node at which an output of the first amplifying circuit is combined with an output of the second amplifying circuit via a first impedance transformer containing a transmission line of an electrical length other than λ/4. The second amplifying device is connected to the summing node via an output matching circuit and a second impedance transformer containing a transmission line.08-20-2009
20110199156POWER AMPLIFIER AND AMPLIFICATION METHOD THEREOF - A power amplifier according to the present invention includes: a carrier amplifier (08-18-2011
20120200353POWER AMPLIFIER AND METHOD OF OPERATION THEREOF - A power amplifier is provided which is capable of performing efficient amplification in a wider transmission signal power range than conventional power amplifiers. The power amplifier for amplifying and outputting an input signal includes first to N-th amplifiers (N is an integer of two or more) which are cascaded. A Doherty amplifier is used in circuit configuration of each of the first to N-th amplifiers. At least one of the first to (N−1)-th amplifiers has a different power ratio from that of the N-th amplifier.08-09-2012
20130027128Systems and Methods of RF Power Transmission, Modulation, and Amplification - Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.01-31-2013
20100156528MULTIPORT AMPLIFIERS IN COMMUNICATIONS SATELLITES - Feedback loops are used within a Multiport Amplifier (MPA) of a communications satellite to maintain phase and amplitude tracking and hence isolation and combining performance. at Ku and Ka-bands, for which there is increasing interest in MPA applications, and where wavelengths are short and maintenance of phase/amplitude tracking becomes highly challenging. Feedback loops are located at strategic points within the MPA Output Network (ONET) to detect tracking errors and provide compensation. Errors are detected through power measurements at “null points”, with zero power corresponding to accurate tracking. The feedback loops adjust the MPA phase/gains such that the levels at these points are maintained at zero. The scheme operates with a pilot signal for measurement of nulls, injected at one of the MPA inputs.06-24-2010
20100117727ASYMMETRIC MULTILEVEL OUTPHASING ARCHITECTURE FOR RF AMPLIFIERS - A radio frequency (RF) circuit includes a power supply configured to generate a plurality of voltages, a plurality of power amplifiers, each having an RF output port and a power supply input port, a switch network having a plurality of input ports coupled to the power supply and a plurality of switch network output ports coupled to the power supply input ports of the plurality of power amplifiers, wherein the switch network is configured to output selected ones of the plurality of voltages from the plurality of switch network output ports, at least two of the switch network output port voltages capable of being different ones of the plurality of voltages, and an RF power combiner circuit having a plurality of input ports coupled to RF output ports of the plurality of power amplifiers and an output port at which is provided an output signal of the RF circuit.05-13-2010
20100117728Signal Amplifiers Having Communications Paths that Automatically Terminate to a Matched Termination in Response to a Power Interruption and Related Methods - RF signal amplifiers are provided that include an RF input port, a first RF output port, a second RF output port and a power input for receiving electrical power. These amplifiers further include a directional coupler having an input that is coupled to the RF input port, a first output and a second output. The second output of the directional coupler is connected to the second RF output port via a non-interruptible communication path. A first switching device having an input, a first output and a second output is also provided. The second output of the first switching device is coupled to a first matched termination. A first diplexer is provided that is coupled between the first output of the directional coupler and the input of the first switching device. A first power amplifier is coupled to the first output of the first switching device, and a second diplexer is coupled between an output of the first power amplifier and the first RF output port. The first switching device is configured to pass signals received at the input to the first switching device to the first output of the first switching device when electrical power is received at the power input and is further configured to terminate signals received at the input to the first switching device through the second output of the first switching device when an electrical power feed to the power input is interrupted.05-13-2010
20100117726AMPLIFIER APPARATUS - An amplifier capable of lowering an electrical current flowing in a peak amplifier before a carrier amplifier becomes saturated to thereby improve the efficiency of an entirety of the amplifier is provided. The amplifier includes a carrier amplifier circuit having an amplifying element operable in class-AB or class-B, and a plurality of peak amplifier circuits which have amplifying elements operating in class-B or class-C and which are arranged to start an operation in stages in response to an input level. An output of the carrier amplifier circuit and outputs of the peak amplifier circuits are combined together for signal output. One of the peak amplifier circuits which is rendered operative at the lowest input level is smaller in saturation output than the carrier amplifier circuit.05-13-2010
20120161865AMPLIFYING DEVICE AND AMPLIFYING METHOD - An amplifying device includes a signal separating unit that separates a first signal and a second signal from an input signal; a first signal-generating unit that generates, based on the first signal, a first cancelling signal that suppresses ringing caused during processing of the first signal; a first combining unit that combines the first signal and the first cancelling signal; a first amplifying unit that amplifies a signal output from the first combining unit; a second signal-generating unit that generates, based on the second signal, a second cancelling signal that suppresses ringing caused during processing of the second signal; a second combining unit that combines the second signal and the second cancelling signal; a second amplifying unit that amplifies a signal output from the second combining unit; and a third combining unit that combines a signal output from the first amplifying unit and one output from the second amplifying unit.06-28-2012
20100052779DOHERTY AMPLIFIER AND SIGNAL AMPLIFICATION SYSTEM HAVING THE SAME, METHOD FOR AMPLIFYING SIGNAL - A Doherty amplifier is provided. The Doherty amplifier includes a first path circuit including a carrier amplifier and a first impedance adjusting circuit connected with the carrier amplifier; and a second path circuit including a peaking amplifier, a second impedance adjusting circuit connected with the peaking amplifier, and a peaking amplifier bias circuit connected with the peaking amplifier. At least one among an impedance of the first impedance adjusting circuit, an impedance of the second impedance adjusting circuit, and a bias of the peaking amplifier bias circuit is adjusted in response to a control signal.03-04-2010
20100164619AMP OUTPUT PROCTECTIVE CIRCUIT FOR LCD PANEL SOURCE DRIVER - An AMP output protective circuit for an LCD panel source driver is disclosed. To solve a problem that internal diodes of PMOS/NMOS of an AMP output circuit are turned on, embodiments are characterized in making input and output voltages of the AMP in a charge sharing interval equal to HVDD and short-circuiting outputs of PAMP and NAMP with VRST_GH and VRST_GL lines, respectively. Accordingly, since there is no increase of voltage (Vth) attributed to a body effect, a speed is not reduced. An additional body bias control circuit is unnecessary. Power consumption can be reduced. Also, an AMP circuit can be more safely protected by adding an output reset function and an AMP protecting circuit.07-01-2010
20100148863Arrangement for reducing interference - An arrangement for reducing interference between circuit blocks having differences in the amount of input power and phase differences includes isolation wires located between the circuit blocks and connected to a ground.06-17-2010
20100073085Generation and Amplification of Substantially Constant Envelope Signals, Including Switching an Output Among a Plurality of Nodes - Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.03-25-2010
20110193627Method and Amplifier for Cancelling Magnetic Coupling - A method for cancelling magnetic coupling in an amplifier is disclosed. The amplifier includes a first path and a second path for outputting a first signal and a second signal, respectively, and the first signal and the second signal have a specific phase difference. The method includes forming a first LC tank and a second LC tank in the first path, and forming a third LC tank and a forth LC tank in the second path.08-11-2011
20110193626FREQUENCY RESPONSE COMPENSATION AMPLIFIER ARRANGEMENTS - An embodiment of the present invention provides a system comprising a summing device and first amplifier portion. The summing device is coupled to an output node. The first amplifier portion is coupled between an input node and the summing device. The first amplifier portion includes a first amplifier, a first filter, and first and second switches. The first amplifier is coupled between the input node and the summing device on a first path. The first filter is coupled between the input node and the first amplifier on a second path, the second path being in parallel to the first path. The first switch is coupled between the input node and the first amplifier along the first path. The second switch is coupled between the input node and the first filter along the second path.08-11-2011
20110193625Amplifier for Cable and Terrestrial Applications with Independent Stage Frequency Tilt - A system comprises a first amplifier stage including a first amplifier, a second amplifier stage including second and third amplifiers, and a fourth amplifier. The first amplifier stage includes an input and an output. The second amplifier stage is coupled between the output of the first amplifier stage and a first output node. The fourth amplifier is coupled between the input of the first amplifier stage and a second output node.08-11-2011
20110193624TUNABLE IMPEDANCE INVERTER FOR DOHERTY AMPLIFIER CIRCUIT - A tunable impedance inverter is presented for a Doherty amplifier circuit having first and second amplifiers connected in parallel between an input circuit for receiving an input signal and an output circuit for supplying an output signal to a load. An impedance inverter is coupled between the first amplifier and the output circuit. The inverter has an input and an output and a tunable mechanical strip line of variable electrical length interposed between the input and the output. An adjuster adjusts the electrical length of the strip line. The adjuster adjustably varies the electrical length of said pathway to thereby adjust the center frequency of said output signal.08-11-2011
20100073084SYSTEMS AND METHODS FOR A LEVEL-SHIFTING HIGH-EFFICIENCY LINC AMPLIFIER USING DYNAMIC POWER SUPPLY - Systems and methods may be provided for a LINC system having a level-shifting LINC amplifier. The systems and methods may include a dynamic power supply that is adjustable to provide at least a first voltage supply level and a second voltage supply level higher than the first voltage supply level; a first power amplifier that amplifies a first component signal to generate a first amplified signal; a second power amplifier that amplifiers a second component signal to generate a second amplified signal, where the first component signal and the second component signal are components of an original signal, where the first component signal and the second component signal each have a constant envelope, and where the original signal has a non-constant envelope, and where the first and second power amplifiers are biased at the first voltage supply level or the second voltage supply level based upon an analysis of an amplitude of the original signal.03-25-2010
20100033241HIGH FREQUENCY AMPLIFIER - Provided is a high frequency amplifier including two amplifying elements of different element sizes connected in parallel and switching the amplifying elements in accordance with a level of output power. In particular, the high frequency amplifier includes an output matching circuit for matching to characteristic impedance (50 ohms) both when the output power is high and low, and increasing impedance when the turned-off amplifying element is viewed from a connection node on an output side of the two amplifying elements. Consequently, characteristics such as high output power and high efficiency can be achieved and it is possible to prevent an amplified high frequency signal from passing around to a matching circuit on a turned-off amplifying element side.02-11-2010
20130082772DIGITALLY-SCALABLE TRANSFORMER COMBINING POWER AMPLIFIER - A digitally configurable transformer that performs switched transformer combining is disclosed. The flexible transformer includes switches that are dynamically configurable to efficiently combine RF power from power amplifier cores to achieve different power levels. The disclosed transformer is efficient at a broad range of power levels, leading to high power output efficiency. The transformer may be part of any power amplifier design that uses the transformer for power combining.04-04-2013
20100045373AMPLIFIER CIRCUIT - An extraction circuit is connected to an input path of an output amplifier. When the power is turned on, the extraction circuit extracts current on the basis of a difference between the normal rise of the supply voltage and a delayed supply voltage. Therefore, a steep rise in the input of the output amplifier when the power is turned on can be removed.02-25-2010
20100109769POWER AMPLIFIER - A power amplifier is provided with a signal generating circuit, a plurality of control signal amplifiers and an RF amplifier. The signal generating circuit outputs the amplitude modulation components of an input signal by dividing the components into a plurality of control signals, and outputs a modulation wave signal or the phase modulation components of the modulation wave signal. The control signal amplifier is provided with a pulse modulator, which performs pulse modulation of a control signal; a switching amplifier, which performs current amplification of a rectangular wave signal outputted from the pulse modulator; and a low-pass filter, which removes spurious components from the signal outputted from the switching amplifier. The RF amplifier amplifies the inputted signal, performs amplitude modulation with the signal outputted from the low-pass filter and outputs the amplitude-modulated signal.05-06-2010
20090278599PROGRESSIVE POWER GENERATING AMPLIFIERS - A power amplifier circuit includes an unequal power splitter that splits an input signal using an unequal power split and provides a first power level signal and a second power level signal. A first amplifier path includes a first transistor amplifier that amplifies the first power level signal, and a second amplifier path includes a second transistor amplifier that amplifies the second power level signal. The second transistor amplifier is configured to turn on at a different power level of the input signal than the first transistor amplifier. An unequal combiner combines the amplified first power level signal and the amplified second power level signal.11-12-2009
20130088292SOLID-STATE IMAGING APPARATUS - A solid-state imaging apparatus includes: an amplifier circuit configured to amplify a signal from pixel; and a reference signal generating circuit configured to generate a ramp signal, wherein feedback capacitor elements having the same structure are electrically connected to a capacitive feedback type amplifier of the amplifier circuit and to a capacitive feedback type amplifier of the reference signal generating circuit respectively, and a connecting configuration between an amplifier of the amplifier circuit and the feedback capacitor element and a connecting configuration between an amplifier of the reference signal generating circuit and the feedback capacitor element are the same.04-11-2013
20090322421POWER EFFICIENT TRANSMITTER WITH HIGH DYNAMIC RANGE - One embodiment of the present invention relates to a method for transistor matching. The power transmitter comprises a first, second, and third amplification path. The paths are selectively activated and deactivated to output a received signal with high efficiency and linearity. The first amplification path is configured to receive a first signal and output a first amplified signal to a first port of a output power combiner when activated and provide an impedance that results in a high reflection factor when deactivated. The second amplification path is configured to receive a second signal with 90° phase shift with respect to the first signal and output a second amplified signal to a second port of the combiner when activated and provide an impedance that results in a high reflection factor when deactivated. The third amplification path is configured to receive a third signal and output a third amplified signal to a third port of the output power combiner when activated and provide an impedance that results in an impedance that matches the output impedance when deactivated.12-31-2009
20090102553DOHERTY AMPLIFIER - The present invention relates to the construction of output stage of the Doherty amplifier and comprises a main amplifying unit, an auxiliary amplifying unit and a compact λ/4 line connecting two amplifying units. The compact λ/4 line connecting two amplifying units includes a first parallel capacitor grounded by being connected to the main amplifying unit in parallel; a second parallel capacitor grounded by being connected to the auxiliary amplifying unit in parallel; and an inductor or a microstrip transmission line connecting the main amplifying unit and the auxiliary amplifying unit. The Doherty amplifier in accordance with the present invention further comprises a matching network unit connecting to a final output by connecting the main amplifying unit and the auxiliary amplifying unit and; and a λ/4 line used as the voltage inputs of the main amplifying unit and the auxiliary amplifying unit.04-23-2009
20120218037CALIBRATION OF SIGNAL PROCESSING APPARATUS - A signal processing apparatus is provided that comprises a signal path including first and second signal processing stages for processing a signal. A switch, in a first state couples and in a second state de-couples an output of the first signal processing stage to an input of the second signal processing stage. An auxiliary stage coupled to the output of the first signal processing stage generates a control signal dependent to a DC level at the output of the first signal processing stage, on a DC level in the auxiliary stage, and indicates a DC offset at an output of the second signal processing stage. A calibration circuit, responsive to the control signal, adjusts a DC level in the signal path preceding the output of the first signal processing stage when the switch is in the second state.08-30-2012
20110006841SWITCHABLE BALANCED AMPLIFIER - A switchable balanced amplifier having multiple, configurable independent input/output paths. Switching networks coupled to the input and/or output quadrature couplers of the balanced amplifier are used to configurably direct any of one or more input signals to any of one or more output ports. In one example, each output port is coupled to circuitry tailored to a specific type of input signal, operating protocol and/or operating frequency band.01-13-2011
20090295473Power Amplifier Architectures - Implementations and examples of power amplifier devices, systems and techniques for amplifying RF signals, including power amplifier systems based on Composite Right and Left Handed (CRLH) metamaterial (MTM) structures.12-03-2009
20120223774LOOK-UP TABLE BASED CONFIGURATION OF MULTI-MODE MULTI-BAND RADIO FREQUENCY POWER AMPLIFIER CIRCUITRY - Circuitry, which includes multi-mode multi-band radio frequency (RF) power amplification circuitry, power amplifier (PA) control circuitry, and a PA-digital communications interface (DCI) is disclosed according to one embodiment of the circuitry. The PA control circuitry is coupled between the amplification circuitry and the PA-DCI, which is coupled to a digital communications bus, and configures the amplification circuitry. The amplification circuitry includes at least a first RF input and multiple RF outputs, such that at least some of the RF outputs are associated with multiple communications modes and at least some of the RF outputs are associated with multiple frequency bands. Configuration of the amplification circuitry associates one RF input with one RF output, and is correlated with configuration information defined by at least a first defined parameter set. The PA control circuitry stores at least a first look-up table (LUT), which provides the configuration information.09-06-2012
20120223773LINEAR MODE AND NON-LINEAR MODE QUADRATURE PA CIRCUITRY - Embodiments of the present disclosure relate to multi-mode multi-band radio frequency (RF) power amplifier (PA) circuitry, which includes a multi-mode multi-band quadrature RF PA coupled to multi-mode multi-band switching circuitry via a single output. The switching circuitry provides at least one non-linear mode output and multiple linear mode outputs. The non-linear mode output may be associated with at least one non-linear mode RF communications band and each linear mode output may be associated with a corresponding linear mode RF communications band. The outputs from the switching circuitry may be coupled to an antenna port via front-end aggregation circuitry. The quadrature nature of the quadrature PA path may provide tolerance for changes in antenna loading conditions.09-06-2012
20110012675POWER AMPLIFICATION DEVICE FOR SATELLITE COMMUNICATION DEVICE - A power amplification device for a satellite communication device with a redundant configuration, in which a plurality of power amplifiers including a standby power amplifier are connected in a ring shape, and which easily switches connection to the standby power amplifier in a case of a failure in active power amplifiers without closing a detour route. The power amplification device for the satellite communication device includes a plurality of basic units each including: a plurality of power amplifiers including at least one standby power amplifier, which are arranged in parallel; a plurality of switches provided to input ends and output ends of the plurality of power amplifiers for switching connection paths; and bypass connection lines for connecting the plurality of switches in a ring shape, and the plurality of basic units are connected in cascade.01-20-2011
20080315946Combiner-Less Multiple Input Single Output (MISO) Amplification with Blended Control - Multiple-Input-Single-Output (MISO) amplification and associated VPA control algorithms are provided herein. According to embodiments of the present invention, MISO amplifiers driven by VPA control algorithms outperform conventional outphasing amplifiers, including cascades of separate branch amplifiers using conventional power combiner technologies. MISO amplifiers can be operated at enhanced efficiencies over the entire output power dynamic range by blending the control of the power source, source impedances, bias levels, outphasing, and branch amplitudes. These blending constituents are combined to provide an optimized transfer characteristic function.12-25-2008
20130162350POWER AMPLIFIER - There is provided a power amplifier capable of increasing linear output power and efficiency without sacrificing an overall gain by employing a vector modulation function in a driving stage, with no separate vector modulator. The power amplifier includes a driving stage performing vector-modulation on an input RF signal to provide an I channel signal and a Q channel signal having different phases and amplifying the I channel signal and the Q channel signal to set gains; and a power stage amplifying power levels of the signals amplified by the driving stage.06-27-2013
201201128333-WAY DOHERTY POWER AMPLIFIER USING DRIVING AMPLIFIER - Disclosed is a 3-way Doherty power amplifier using a driving amplifier in which driving amplifiers are connected to the front stages of a carrier amplifier and a peaking amplifier, respectively, so as to obtain a high gain and a high efficiency. To this end, the Doherty power amplifier includes: a hybrid power distributor for distributing an input signal into first and second path units; and a driving amplifier for receiving a signal outputted from the hybrid power distributor and controlling the driving of a carrier amplifier, a first peaking amplifier, and a second peaking amplifier, wherein: the carrier amplifier, the first peaking amplifier, and the second peaking amplifier are connected to a rear stage of the driving amplifier, respectively; the first path unit generates a high efficiency at a low input power; and the second path unit maintains a high efficiency and gain in a high output range.05-10-2012
20100079205Multi-Channel Amplifier - Individual channels, to which a sound signal inputting portion In having a pin jack with NC setting and an amplifier circuit Amp are provided respectively, are provided in parallel from a higher order to a lower order every four L/R channels, and a cascade connection configuration in which a signal terminal S of the higher order channel is connected to an NC contact of the lower order channel successively is employed. Accordingly, the signal on the higher order side can be transmitted to the lower order side, and as a result there is no need to input the common (Bus) signal apart from the signals on the individual channels and also the changeover switch can be omitted.04-01-2010
20110279178Multi-band high-efficiency doherty amplifer - The present invention relates to a Multi-Band Doherty amplifier. Embodiments of the present invention provide an amplifying structure including a main amplifier configured to amplify a first signal, a peak amplifier configured to amplify a second signal, a tunable impedance inverter configured to perform impedance inversion to modulate a load impedance of the main amplifier, and a combining node configured to receive the amplified second signal from the peak amplifier and an output of the tunable impedance inverter. The tunable impedance inverter includes a tuner configured to tune the impedance inversion over at least one broad frequency band. The tuner is (i) at least one capacitor, (i) at least one varactor, or (ii) at least one open stub shunted by a diode.11-17-2011
20090231033Amplifier Circuit - Power consumption of current sources in an amplifier circuit is reduced even during amplifier operation while keeping linearity of an output signal. The amplifier circuit is suitable for use in a signal generator that provides an output signal previously set by a user and having a known level. Positive and negative current sources receive an input voltage Vi depending on an output voltage Vo. An output resistor derives the output voltage Vo from currents provided by the positive and negative current sources. A variable bias generation circuit produces positive and negative bias voltages applied to the positive and negative current sources wherein the positive and negative bias voltages are set while the linearity of the output voltage is maintains using the known output level information.09-17-2009
20110140776VARIABLE FREQUENCY AMPLIFIER - A variable frequency amplifier includes a main amplifier system 06-16-2011
20080272840Multiple-Input and Multiple-Output Amplifier - The invention relates to an amplifier capable of producing a plurality of currents at its output terminals, these currents being controlled by a plurality of input voltages. A multiple-input and multiple-output amplifier of the invention includes 4 signal input terminals, 4 signal output terminals, 4 active sub-circuits and a feedback network. Each active sub-circuit has a sub-circuit input terminal connected to one of the signal input terminals, a sub-circuit output terminal connected to one of the signal output terminals and a sub-circuit common terminal. The feedback network has terminals connected to the sub-circuit common terminal of each active sub-circuit. The feedback network presents, in a known frequency band, an impedance matrix producing a negative feedback such that the transfer admittance matrix of the multiple-input and multiple-output amplifier approximates a given admittance matrix.11-06-2008
20100007412PULSED LOAD MODULATION AMPLIFIER AND METHOD - Improved power amplifiers and related methods using a pulsed load modulation technique that controls the load modulation characteristics in a digital pulsed fashion.01-14-2010
20110285460HIGH FREQUENCY AMPLIFIER, WIRELESS DEVICE, AND CONTROL METHOD - Provided is a high frequency amplifier that can suppress from increasing the circuit size while improving efficiency at the time of low output. A high frequency amplifier according to one aspect of the present invention includes a carrier amplifier 11-24-2011
20120032738POWER AMPLIFIER - An efficient power amplifier with a design which, even in cases when the phase characteristics of high frequency devices used in a main amp and peaking amp differ, reduces the combination loss of the two amps at a wide range of output levels. A class AB power amplifier (02-09-2012
20110298537VOLTAGE DISTRIBUTION FOR CONTROLLING CMOS RF SWITCH - Disclosed are voltage distribution device and method for controlling CMOS-based devices for switching radio frequency (RF) signals. In certain RF devices such as mobile phones, providing different amplification modes can yield performance advantages. For example, a capability to transmit at low and high power modes typically results in an extended battery life, since the high power mode can be activated only when needed. Switching between such amplification modes can be facilitated by one or more switches formed in an integrated circuit and configured to route RF signal to different amplification paths. In certain embodiments, such RF switches can be formed as CMOS devices, and can be based on triple-well structures. In certain embodiments, various bias voltages applied to such a CMOS RF switch can be facilitated by a voltage distribution component.12-08-2011
20110291754Segmented Power Amplifier with Varying Segment Activation - Various apparatuses and methods for varying segment activation in a segmented power amplifier are disclosed herein. For example, some embodiments provide a power amplifier including an input, an output, a plurality of amplifier segments and a controller. The amplifier segments are connected in parallel between the input and the output and are adapted to be activated and inactivated. The power level at the output may be controlled by changing a number of the amplifier segments that are activated concurrently. The controller is connected to the amplifier segments and is adapted to vary which of the amplifier segments are activated to arrive at a selected number of activated amplifier segments.12-01-2011
20090167434DEVICE, SYSTEM, AND METHOD OF SEMI-DOHERTY OUTPHASING AMPLIFICATION - Device, system, and method of semi-Doherty outphasing amplification. For example, an apparatus includes: a first circuit path comprising a first switching amplifier connected in parallel through a first quarter-wave transmission line to a second switching amplifier; and a second circuit path comprising a third switching amplifier connected in parallel through a second quarter-wave transmission line to a fourth switching amplifier, wherein the first circuit path is connected to a circuit node through a third quarter-wave transmission line, and wherein the second circuit path is connected to said circuit node through a fourth quarter-wave transmission line.07-02-2009
20100033242SYSTEM AND METHOD FOR IM3 REDUCTION AND CANCELLATION IN AMPLIFIERS - Sets of power amplifier branches (which comprise an RF/microwave amplifier stage) are power combined within each stage and each set of power amplifier branches are biased in different classes of operation by bias circuits possessing different impedance characteristics such that the fundamental frequency components present at the output are in-phase with one another and the IMD3 components are anti-phase over a broad range of power levels. The RF input signal is provided by the output of the previous stage of the RF/microwave amplifier. The output of each stage is formed by power combining sets of these power amplifier branches, each of which are separately biased, so the fundamental components are additive resulting in the maximum possible output power and the IM3 components cancel partially or completely. IM3 reduction or cancellation can be achieved over a large range of output powers with the use of a feed forward control loop monitoring the input power and appropriately adjusting the bias currents and impedance characteristics of the bias circuits feeding the individual power amplifier branches in each stage of the RF/microwave amplifier.02-11-2010
20100033243Amplifying Apparatus - The amplifying apparatus includes an amplifier having a circuit constant determined so as to satisfy a condition for E-class operation; power detecting unit which detects an output electricity from the amplifier; and controlling unit which controls the circuit constant in accordance with the output power detected by the power detecting unit.02-11-2010
20110215865POWER AMPLIFIER - Disclosed herein is a power amplifier. The power amplifier includes N power amplification means, a transformer, and a harmonic elimination unit. Each of the N power amplification means amplifies an input signal into a predetermined level. The transformer includes N/2 primary windings respectively connected to the output terminals of the power amplification means and a secondary winding configured such that coil elements are connected in series between an output terminal and a ground, and sums power transmitted from the primary windings. The harmonic elimination unit is disposed across both ends of the secondary winding of the transformer, and eliminates the output of the harmonic frequencies of a preset frequency.09-08-2011
20120139628METHOD AND ARRANGEMENT IN A MOBILE COMMUNICATIONS SYSTEM - The invention is based on the fact that the current output from a DDB controlled amplifier in backoff, i.e. for low amplitudes, is reduced more or less linearly with the amplitude of the signal to be amplified. Therefore, it is enough to use smaller amplifiers which are able to output the necessary RF current. Hence, according to the present invention, the total DDB amplifier is divided into smaller parts that are coupled to the output only when needed.06-07-2012
20110215866 ASYMMETRIC MULTILEVEL OUTPHASING ARCHITECTURE FOR RF AMPLIFIERS - A radio frequency (RF) circuit includes a power supply configured to generate a plurality of voltages, a plurality of power amplifiers, each having an RF output port and a power supply input port, a switch network having a plurality of input ports coupled to the power supply and a plurality of switch network output ports coupled to the power supply input ports of the plurality of power amplifiers, wherein the switch network is configured to output selected ones of the plurality of voltages from the plurality of switch network output ports, at least two of the switch network output port voltages capable of being different ones of the plurality of voltages, and an RF power combiner circuit having a plurality of input ports coupled to RF output ports of the plurality of power amplifiers and an output port at which is provided an output signal of the RF circuit.09-08-2011
20090015323Balanced amplifier with protection circuit - According to an exemplary embodiment, a balanced amplifier includes an in-phase amplifier coupled to a first input port of an output coupler and a quadrature amplifier coupled to a second input port of the output coupler. The balanced amplifier further includes an impedance termination coupled to an isolated port of the output coupler. The balanced amplifier further includes a protection circuit coupled to the isolated port of the output coupler and configured to limit an amount of power applied across the impedance termination. The balanced amplifier further includes an input coupler having a first output port coupled to an input of the in-phase amplifier and a second output port coupled to an input of the quadrature amplifier.01-15-2009
20110018629REFERENCE VOLTAGE SUPPLY CIRCUIT - A reference voltage supply circuit is provided. The reference voltage supply circuit includes a first amplifier for amplifying a first input voltage and a fed back first reference voltage, a second amplifier for amplifying a second input voltage and a fed back second reference voltage, a reference voltage generator for generating the first reference voltage and the second reference voltage according to output signals of the first and second amplifiers and feeding the first and second reference voltages back to the first and second amplifiers, and a glitch remover turned on/off according to an input pulse signal to conduct or cut off current flowing between a power supply terminal and the ground.01-27-2011
20110148518DYNAMIC RANGE IMPROVEMENTS OF LOAD MODULATED AMPLIFIERS - The present invention relates to methods and devices to control and operate the functionality of a power amplifier system (06-23-2011
20100007413ECG ELECTRODE CONTACT QUALITY MEASUREMENT SYSTEM - A system and method are provided for generating output signals indicative of contact quality of a plurality of electrodes coupled to a patient. A signal generator coupled to a reference electrode injects an alternating signal into the patient. A plurality of differential amplifiers, each coupled to a respective one of the plurality of electrodes to detect an input signal from the patient, are operable to output a respective output signal in response to a respective input signal. The output signal generated by the respective differential amplifier is indicative of contact quality for the respective electrode.01-14-2010
20090206926High Efficiency Amplifier - When an input signal level is small, the electrical length of a phase line 08-20-2009
20100289571APPARATUS AND METHOD FOR MAXIMIZING PERFORMANCE OF PEAKING AMPLIFIER IN DOHERTY AMPLIFIER - An apparatus and method for maximizing the performance of a peaking amplifier in a Doherty amplifier are provided. The apparatus includes a splitter, a carrier amplifier, an (N−1) number of peaking amplifiers, a Doherty combiner, and an output load. The splitter splits an input signal into an ‘N’ number of power signals. The carrier amplifier amplifies the signal provided from the splitter using a first Direct Current (DC) bias. The peaking amplifiers amplify the signals provided from the splitter using a second DC bias, which is lower than the first DC bias. When the carrier amplifier and the peaking amplifiers are all operating, the Doherty combiner forms a load impedance of the respective amplifiers such that the load impedance of the peaking amplifiers are less than the load impedance of the carrier amplifier. The output load outputs the signals amplified by the carrier amplifier and the peaking amplifiers.11-18-2010
20090102554Output Networks In Combination With LINC Technique - The present invention relates to balanced power amplifier network in combination with outphasing techniques such as Chireix. The object of the present invention is to provide a solution to the problem to combine balanced amplifiers like the current mode class D (CMCD) or class E/F with a LINC network. The main problem is that some power amplifiers have balanced output and the LINC network is single-ended so that a high power low loss transformer that works at several impedance levels is needed, which is hard to realize at cellular frequencies.04-23-2009
20090261900Apparatus for Coupling at Least One of a Plurality of Amplified Input Signals to an Output Terminal Using a Directional Coupler - An apparatus has an input terminal configured to receive an input signal, a network coupled to the input terminal and configured to provide a plurality of amplified input signals, and a directional coupler coupled to the network and configured to couple at least one of the plurality of amplified input signals to an output terminal.10-22-2009
20090261901DECADE BANDWIDTH PLANAR MMIC FOUR PORT TRANSFORMER - A wide bandwidth planar four port MMIC transformer is provided by input diplexers which divide up the incoming signal into a high band and a low band, with the resulting signals coupled to high band and low band four port transformers implemented in one embodiment using spiral inductors and coupled lines, the outputs of which are combined using two output diplexers to provide a decade bandwidth transformer.10-22-2009
20110204974APPARATUS FOR IMPROVING PERFORMANCE AT LOW POWER REGION IN A DOHERTY AMPLIFIER - A method and apparatus improve the performance of a carrier amplifier in a Doherty amplifier. The Doherty amplifier includes a power divider, a carrier amplifier, at least one peaking amplifier, offset lines, and a Doherty circuit. The power divider provides a power signal to each of the carrier amplifier and the at least one peaking amplifier. The carrier amplifier amplifies power of a signal inputted from the power divider. The at least one peaking amplifier amplifies power of a signal inputted from the power divider. The offset lines control a load impedance when the at least one peaking amplifier does not operate. When the at least one peaking amplifier does not operate, the Doherty circuit generates the load impedance of the carrier amplifier that is larger than twice a load impedance at the maximum output power of the carrier amplifier.08-25-2011
20110204973AMPLIFYING DEVICE AND SIGNAL PROCESSING METHOD BASED ON AMPLIFYING DEVICE - An amplifying device and a signal processing method based on an amplifying device are provided, capable of reducing performance requirements of modules and reducing design difficulty of the modules. The amplifying device includes at least one amplifying module, including two receiving paths, in which a first receiving path is configured to attenuate and amplify an input signal after the input signal is pre-amplified, and a second receiving path is configured to amplify the input signal when the input signal is not pre-amplified. The signal processing method based on the amplifying device is further provided. The amplifying device and the signal processing method may be applied in a communication network system.08-25-2011
20100201441AMPLIFYING DEVICE - The present invention concerns a composite amplifier and a method for controlling the amplitude of a composite amplifier in a node of a wireless communication system. The composite amplifier comprises a first amplifier and a second amplifier that are arranged to be connected via an output combiner network to a load. The method comprises decomposing an input signal into a first signal component and a second signal component. Further, the method comprises differentiating the amplitude on the first signal component from the amplitude on the second signal component. the differentiation is made such that the aggregated efficiency of the composite amplifier is increased. The present invention also concerns a radio transmission device comprising a composite amplifier.08-12-2010
20120293252Systems and Methods of RF Power Transmission, Modulation, and Amplification, Including Varying Weights of Control Signals - Embodiments of the present invention include a method and system for control of a multiple-input-single output (MISO) device. For example, the method includes determining a change in power output level from a first power output level to a second power output level of the MISO device. The method also includes varying one or more weights associated with respective one or more controls of the MISO device to cause the change in power output. The one or more controls can include one or more of (a) a phase control of one or more input signals to the MISO device, (b) a bias control of the MISO device, and (c) an amplitude control of the input signals to the MISO device11-22-2012
20120293251DOHERTY POWER AMPLIFIER AND IMPLEMENTATION METHOD THEREOF - A Doherty power amplifier and an implementation method thereof are disclosed. The Doherty power amplifier includes a carrier power amplifier circuit and a peak power amplifier circuit, wherein, the peak amplifier circuit is configured with a Radio Frequency (RF) switch for controlling turn-on of peak power amplifiers in the peak amplifier circuit; and a part or all of carrier power amplifiers in the carrier power amplifier circuit use GaN devices, and a part or all of the peak power amplifiers in the peak power amplifier circuit use LDMOS devices.11-22-2012
20080231358POWER AMPLIFIER CIRCUIT - In a third operation in an amplifier, in which first and second amplifier circuits amplify a input signal, a distribution circuit adjusts the power of the signal supplied to the first amplifier circuit to within a range in which the input power to the first amplifier circuit and the output power from the first amplifier are proportional to each other. In a linear operation, the power of the signal from the first amplifier circuit and input to the comparison circuit and the power of the signal from the second amplifier circuit and input to the comparison circuit are equal. The comparison circuit adjusts the gain or the saturated power of the second amplifier circuit on the basis of the difference between the signals from the first and second amplifier circuits and input to the comparison circuit, so that the input power to the second amplifier circuit and the output power from the second amplifier circuit are proportional to each other.09-25-2008
20120105149POWER AMPLIFIERS - Various aspects of the disclosure provide high power and high efficiency power amplifier systems that can be integrated on a chip using integrated circuit processes such as a standard CMOS and SiGe process. A power amplifier system is disclosed according to one aspect. The power amplifier system comprises a first power amplifier, a Wilkinson power splitter, second-stage amplifiers, and a Wilkinson power combiner. The first power amplifier pre-amplifies an RF input signal. The Wilkinson power splitter then splits the power of the amplified RF signal outputted by the first power amplifier among the second-stage amplifiers. Each of the second-stage amplifiers amplifies the respective RF signal from the Wilkinson power splitter. The Wilkinson power combiner then sums the powers of the amplified RF signals outputted by the second-stage amplifiers and outputs the resulting combined RF signal.05-03-2012
20130120061Doherty Amplifier Circuit - The present invention relates to an amplifier comprising a plurality of Doherty amplifier cells each Doherty amplifier cell comprising an input and an output respectively connected to an input and an output of the amplifier, a main amplifier stage, a peak amplifier stage and a signal combining circuit configured to combine signals from outputs of the main and peak amplifiers and provide a combined signal to the output of the Doherty amplifier cell. Each cell comprises a controllable splitter having an input connected to the input of the Doherty amplifier cell. The controllable splitter is configured to receive a splitter control signal and modify an amplitude and phase of a signal at the input of the Doherty amplifier cell in response to the splitter control signal.05-16-2013
20090184763APPARATUS AND METHOD FOR DIGITAL PRE-DISTORTION, SHARING FEEDBACK PATH IN A MULTIPLE ANTENNA WIRELESS COMMUNICATION SYSTEM - A multiple antenna wireless communication system using a DPD power amplifier and a method for controlling an amplitude of an input signal for a plurality of transmission paths of the DPD power amplifier are provided. The system includes a plurality of amplifiers, a plurality of couplers, a switch, a shared feedback path and a plurality of processors. The plurality of amplifiers amplifies an input signal directed to each of the transmission paths. The plurality of couplers couple amplified signals on respective transmission paths. The switch outputs at least one of the amplified signals coupled on the respective transmission paths. The shared feedback path provides the amplified signal output from the switch to a plurality of processors. The plurality of processors compare a feedback signal provided through the shared feedback path with the input signal and pre-distort the input signal such that the input signal and the amplified signal have a linear relation with each other.07-23-2009
20090128234TWO-PEAK-POWER-LEVEL CONTROL METHOD AND DEVICE FOR A PULSE-MODE AMPLIFIER - A device for controlling least two peak power levels for an amplifier operating in pulse mode, characterized in that it comprises at least the following elements: 05-21-2009
20090140804METHOD AND APPARATUS FOR IMPROVING THE PERFORMANCE OF MIMO WIRELESS SYSTEMS - Method and apparatus for efficiently providing DC power enhancement to power amplifiers each of which being arranged in a MIMO system, by suing an enhancement circuitry with a plurality of inputs and outputs. Each input has a corresponding DC enhancement output that is connected to a DC enhancement input of a power amplifier. The DC enhancement output becomes operative whenever the amplitude of the corresponding input signal exceeds a predetermined threshold. The envelope of a plurality of input signals is sampled by sampling circuitries and the sampled envelopes are fed into a summation circuitry, in which they are summed. Whenever one of the sampled envelopes exceeds the threshold, a DC enhancement power is simultaneously provided to all DC enhancement inputs of all power amplifiers.06-04-2009
20080238541SPATIALLY DISTRIBUTED AMPLIFIER CIRCUIT - An exemplary amplifier circuit includes a first group of spatially distributed final amplifier stages having a first configuration, and a second group of spatially distributed final amplifier stages having a second configuration different than the first configuration. Both groups share the same control node for their respective final amplifier stages, and both groups share the same amplifier output node. Each group is typically enabled at a time that the other is disabled. In certain embodiments incorporating a memory array, only one critical analog node must be routed throughout the memory array.10-02-2008
20090231032LINC amplifying device - An amplifying apparatus includes a splitting unit for splitting an input signal into a first split signal and a second split signal; phase-shifting unit for phase-shifting the first split signal and the second split signal, respectively; a first amplifying unit for amplifying a first phase-shifted signal and outputting the signal as a first output signal; a second amplifying unit for amplifying, in a substantially identical manner to the first amplifying unit, a second phase-shifted signal and outputting the signal as a second output signal; and a matching unit for matching the first output signal and the second output signal to a first transmission unit and a second transmission unit, respectively. The first transmission unit is for transmitting the first output signal from the matching unit to a load resistor, and the second transmission unit is for transmitting the second output signal from the matching unit to the load resistor.09-17-2009
20090195307MULTIPLE-PATH POWER AMPLIFIER - An amplifier circuit and method for amplifying a signal efficiently over a plurality of power ranges. The amplifier circuit including a strong amplifier which is efficient over a first power range and a weak amplifier which is efficient over a second power range. An impedance transformation circuit is used for generating a higher potential and providing increased efficiency when the second range of power is present. A circuit biases active the strong amplifier when the first power range of is present and biases active the weak amplifier when the second power range is present.08-06-2009
20090206928Enhanced doherty amplifier with asymmetrical semiconductors - The present disclosures an amplification unit which comprises a first amplifier and a second amplifier connected in parallel, the first amplifier and the second amplifier comprising semiconductor devices that are not the same amplifier design. The present application also discloses a signal input line connected to the first amplifier and the second amplifier. A signal output line is also disclosed which is connected to the first amplifier and the second amplifier.08-20-2009
20090212858Integrated Doherty type amplifier arrangement with high power efficiency - The present invention relates to an integrated Doherty type amplifier arrangement and an amplifying method for such an arrangement, wherein a lumped element hybrid power divider (08-27-2009
20110140774ONE-SIDED SWITCHING PULSE WIDTH MODULATION AMPLIFIERS - One-sided pulse width modulated (PWM) amplifiers are disclosed. An example amplifier includes an integrator to receive first and second analog signals, and to output a first amplified signal and a second amplified signal based on the first and second analog signals, a reference changer coupled to the integrator to determine whether a first amplitude is higher than a second amplitude based on the first and second analog signals, to selectively cause the integrator to apply a first resistance between a reference node and the first amplified signal and apply a second resistance between the reference node and the second amplified signal when the first amplitude is higher than the second amplitude, and to selectively cause the integrator to apply the second resistance between the reference node and the first amplified signal and apply the first resistance between the reference node and the second amplified signal when the second amplitude is higher than the first amplitude, and first and second comparators coupled to the integrator to receive the first and second amplified signals, to compare the first and second amplified signals to a reference signal, and to output first and second pulse width modulated signals having respective first and second pulse widths based on the comparisons between the first and second amplified signals and the reference signal.06-16-2011
20110140775COMBINED CELL DOHERTY POWER AMPLIFICATION APPARATUS AND METHOD - A Doherty power amplification apparatus and method using a combined cell are provided. The Doherty power amplification apparatus includes, a power splitter for splitting an input power, and outputting the split powers to a carrier amplification unit and (N−1) peaking amplification units, wherein the carrier amplification unit, including M carrier power amplifiers, for amplifying power output from the power splitter; the (N−1) peaking amplification units, each of which includes M peaking power amplifiers, for amplifying the respective split powers output from the power splitter, and a power combiner for combining a power amplified by the carrier amplification unit and the respective split powers amplified by the (N−1) peaking amplification units, and for outputting the combined power, wherein N represents an integer obtained by adding a number of the carrier amplification units and a number of the (N−1) peaking amplification units, and M represents an integer which is equal to or more than 1.06-16-2011
20100148862METHOD AND APPARATUS FOR ENHANCING PERFORMANCE OF DOHERTY POWER AMPLIFIER - An apparatus and method for enhancing performance of a Doherty power amplifier are provided. The method includes a signal separation unit for generating a first input signal serving as an input signal of a carrier power amplifier using an input signal and a second input signal serving as an input signal of a peaking power amplifier using the input signal, in which the first input signal is different from the second input signal.06-17-2010
20100148861METHOD OF FORMING A CHARGE PUMP CONTROLLER AND STRUCTURE THEREFOR - In one embodiment, an amplifier circuit is formed to minimize pop and click noise on the outputs of the amplifier circuit. The amplifier circuit is configured to place an output stage of the amplifier circuit in a high impedance state to minimize the pop and click noise. In another embodiment, the amplifier circuit is configured to couple the inputs of two amplifiers together to minimize the pop and click noise.06-17-2010
20100188147MULTI-WAY DOHERTY AMPLIFIER - An electronic circuit has a multi-way Doherty amplifier. The multi-way Doherty amplifier comprises a two-way Doherty amplifier with a main stage and a first peak stage that are integrated in a semiconductor device; and at least one further peak stage implemented with a discrete power transistor.07-29-2010
20100188146High Efficiency Power Amplifier Having Embedded Switching - A power amplifier includes at least one amplification path comprising at least a first amplification device and a second amplification device, where the first amplification device has a common control terminal to provide amplification when biased on and to prevent conduction of a signal through the amplification path when biased off.07-29-2010
20100259325PRESELECTOR AMPLIFIER - A preselector amplifier system and method including of various components is described. The various components may include a vector generator, an active power splitter, an active power combiner, or the like. The preselector amplifier may be integral to and/or coupled to a communications system. The communications system may be at least one of a transceiver, receiver and/or transmitter. The communications system may transmit radio frequency (RF) signals.10-14-2010
20110102079High efficiency linear amplifier - A high efficiency linear amplifier is disclosed. The amplifier comprises an input module having an input coupled to receive an input signal, a first output configured to provide a first signal component, and a second output configured to provide a second signal component. The amplifier also comprises a switching module having a switch input coupled to receive a switch signal, a first input coupled to the first output of the input module, a second input coupled to the second output of the input module, and at least a first output configured to provide a first composite signal. The amplifier further comprises an amplifier module having at least a first input coupled to the first output of the switching module and at least a first output, wherein the first and second signal components comprise constant envelope phase varying signals having different phase relationships and which correspond to the input signal, and wherein the first composite signal comprises temporally sequenced portions of the first and second signal components.05-05-2011
20100141337AMPLIFIER WITH PROGRAMMABLE OFF VOLTAGE - An amplifier with multiple stages and having improved reliability is described. The multiple amplifier stages are coupled in parallel and include at least one switchable amplifier stage. Each switchable amplifier stage may be operated in an on state or an off state and includes a gain transistor and a cascode transistor. The gain transistor amplifies an input signal and provides an amplified signal in the on state and is disabled in the off state. The cascode transistor buffers the amplified signal and provides an output signal in the on state and is disabled based on an off voltage in the off state. The off voltage may be greater than zero volts or may have one of multiple possible values. The off voltage may be generated based on an output signal level, e.g., may be set to different values for different ranges of output signal level.06-10-2010
20100219887RF POWER AMPLIFIER WITH LINEARITY CONTROL - A linear amplifier circuit includes a multi-stage power amplifier that can amplify an input signal to produce an output signal, and a gain feedback control circuit coupled with the output and the input of the multi-stage power amplifier. An adjacent-channel leakage feedback control circuit can detect the output signal at the output of the multi-stage power amplifier and reduce adjacent-channel leakage in the output signal over an output power range based on the detected output signal.09-02-2010
20090273398DOHERTY POWER AMPLIFIER - The present invention relates to a power amplifier; and, more particularly, to a Doherty power amplifier. The power amplifier includes at least one carrier amplifier; at least one peaking amplifier arranged in parallel with the carrier amplifier in such a manner that the carrier amplifier and the peaking amplifier collectively operate as a Doherty amplifier; a plurality of input matching circuits, at least one of which is respectively connected to an input ends of the carrier amplifier and the peaking amplifier; at least one impedance control circuit, each of which is connected to an output end of each carrier amplifier for controlling a load line impedance of the said each carrier amplifier; at least one output matching circuit directly or indirectly connected to output ends of the impedance control circuit and the peaking amplifier; and at least one first delay circuit for matching delays between the carrier amplifier and the peaking amplifier. The present invention provides an improved Doherty power amplifier capable of achieving a further miniaturization and integration while maintaining an advantage in terms of efficiency and linearity of a Doherty power amplifier by employing an improved output and input matching method, and capable of operating more similar to the ideal operation of a Doherty power amplifier by applying an improved input power division method thereto.11-05-2009
20090108930High power commutating multiple output amplifier system - An amplifier system includes a power divider for dividing an input RF signal into M RF signals of equal power and phase. The system has M low power selectable phase shifters each for phase shifting one of the M RF signals. M high power amplifiers are coupled to respective ones of the phase shifters. The system includes an M×N power distribution network having M input ports and N output ports, such as a Butler matrix. The M high power amplifiers are connected to a respective one of the M input ports of the distribution network. The phase of the M phase shifters may be adjusted to obtain a maximum output at the desired output with all the other outputs nulled.04-30-2009
20100295610CIRCUIT WITH A POWER AMPLIFIER AND AMPLIFICATION METHOD - In a power amplification circuit an output signal is generated by combining the power of a first and second signal that have been amplified separately. An input signal is received that indicates a desired amplitude and phase of the output signal. A controllable phase shift circuit adapts the phase of first and second signals dependent on the desired amplitude, so that, when the signals with the adapted phases are combined, the resulting output signal will have an envelope with the desired amplitude. A time dependent common mode phase shift is applied to both the first and second signal. A control circuit selects the time dependent common mode phase shift as a function of the desired amplitude of the output signal, to compensate for envelope amplitude dependence of a common phase shift introduced by the amplification.11-25-2010
20110121896LOGARITHMIC MEAN-SQUARE POWER DETECTOR WITH SERVO CONTROL LOOP - A variable gain amplifier includes a plurality of amplification elements arranged to generate amplified representations of an RF input signal at a plurality of nodes. A plurality of controllable response elements each have an input coupled to a different one of the nodes to receive a different one of the amplified representations of the RF input signal. A scale factor generator is coupled to each of the controllable response elements. The scale factor generator receives a gain control signal and generates scale factor signals for varying the response of each of the controllable response elements such that as the scale factor generator sweeps through a full range of the gain control signal, the response of each of the controllable response elements is, in succession, increased smoothly to a peak and thereafter decreased smoothly to a lower level to produce a scaled output. A summing element is coupled to the controllable response elements for combining the scaled outputs of the controllable response elements to generate an output of the variable gain amplifier having a given gain range.05-26-2011
20110037516MULTI-STAGE IMPEDANCE MATCHING - Exemplary techniques for performing impedance matching are described. In an exemplary embodiment, the apparatus may include an amplifier (e.g., a power amplifier) coupled to first and second matching circuits. The first matching circuit may include multiple stages coupled to a first node and may provide input impedance matching for the amplifier. The second matching circuit may include multiple stages coupled to a second node and may provide output impedance matching for the amplifier. At least one switch may be coupled between the first and second nodes and may bypass or select the amplifier. The first and second nodes may have a common impedance. The apparatus may further include a second amplifier coupled in parallel with the amplifier and further to the matching circuits. The second matching circuit may include a first input stage coupled to the amplifier, a second input stage coupled to the second amplifier, and a second stage coupled to the two input stages via switches.02-17-2011
20110043280LOW NOISE, LOW POWER INSTRUMENTATION AMPLIFIER - An instrumentation amplifier includes a pair of buffered operational amplifiers that accept a pair of input signals, and a differential operational amplifier that outputs an output signal indicative of a difference between the input signals. A low pass filter provides passive band limiting of the output signal. Each operational amplifier is implemented as a multi-path amplifier that includes a low frequency path and a high frequency path between an input and an output of the operational amplifier. Further, each multi-path amplifier includes a differential input transconductance stage within the low frequency path and a differential input transconductance stage within the high frequency path. Within each multi-path amplifier, the differential input transconductance stage of the high frequency path is noisier than, but consumes less power than, the differential input transconductance stage of the low frequency path. Each multi-path amplifier provides noise shaping that results in an increase in noise above a crossover frequency of the multi-path amplifier.02-24-2011
20110043281DYNAMICALLY ADJUSTABLE LOW NOISE, LOW POWER INSTRUMENTATION AMPLIFIER - A circuit in accordance with an embodiment of the present invention includes an instrumentation amplifier, a dynamically adjustable low pass filter, at least one monitor and a controller. The instrumentation amplifier includes a pair of buffered operational amplifiers that accept a pair of input signals, and a differential operational amplifier that outputs an output signal indicative of a difference between the pair of input signals. The dynamically adjustable low pass filter is configured to provide band limiting of the output signal at frequencies greater than a cutoff frequency. The monitor, or monitors, is/are configured to monitor a signal upstream of the instrumentation amplifier and/or a signal downstream of the instrumentation amplifier and output a monitor signal. The controller is configured to receive the monitor signal, or signals, and to dynamically adjust output voltage noise at frequencies greater than the crossover frequency of the multipath amplifiers and/or the cutoff frequency of the low pass filter based on the monitor signal, or signals.02-24-2011
20110241773Multi-Channel Radio Frequency Generator - A multi-channel radio frequency (RF) generator module includes N power amplifiers, M drivers, a power supply module, and a control module. The N power amplifiers generate N RF outputs, respectively. The M drivers drive the N power amplifiers based on M driver control signals, respectively. The power supply module receives alternating current (AC) input power and applies L rail voltages to the N power amplifiers based on L rail voltage setpoints, respectively. The control module sets the L rail voltage setpoints and the M driver control signals. N is an integer greater than one, L and M are integers greater than zero, and M and L are less than or equal to N.10-06-2011
20110018628DYNAMIC BIAS SUPPLY DEVICES - A dynamic bias supply device for multiple parallel power amplifiers, in which a plurality of parallel power amplifiers including a Doherty amplifier are connected in parallel, is provided. The dynamic bias supply device includes a plurality of switches respectively corresponding to each of the parallel power amplifiers. The dynamic bias supply device is used in a distributed manner as multiple distributed dynamic bias switching circuits for the multiple parallel power amplifiers. Accordingly, performance deterioration is not caused by an additional connection structure, and it is possible to achieve high efficiency and high linearity of the power amplifiers.01-27-2011
20110241774Versatile Audio Power Amplifier - An audio power amplifier includes a first and a second amplification unit, each including a switching voltage amplifier, an output filter, a current compensator, an inner current feedback loop feeding a measurement of current measured at the output inductor back to a summing input of the current compensator, a voltage compensator coupled to the summing input of the current compensator, and an outer voltage feedback loop. A controlled signal path provides the output of the voltage compensator of the first amplification unit to the current compensator of the second amplification unit. The first and second amplification units are operable with separate loads, in parallel driving a common load, or across a bridge-tied-load. A second pair of amplification units may be added and operated together with the first pair to drive a single speaker with a parallel pair of amplifiers on each side of a bridge-tied-load.10-06-2011
20100026388Balanced Amplifying Device Having a Bypass Branch - A balanced amplifier includes a bypass branch (02-04-2010
20110210786Doherty Amplifier with Input Network Optimized for MMIC - In a Doherty amplifier (09-01-2011
20090315622FEEDFORWARD AMPLIFIER AND CONTROL METHOD THEREOF - In a feedforward amplifier (12-24-2009
20110074503OPERATIONAL AMPLIFIER - Provided is an operational amplifier capable of correcting an offset voltage of an element to be connected to an input terminal. The operational amplifier includes a main amplifier and an offset correction amplifier, which include input terminals connected in common. The main amplifier includes: a first transconductance amplifier for measurement; a second transconductance amplifier for offset correction; and a first capacitor connected to an input terminal of the second transconductance amplifier. The offset correction amplifier includes: a third transconductance amplifier for measurement; a fourth transconductance amplifier for offset correction; and a second capacitor connected to one input terminal of the fourth transconductance amplifier. An offset voltage adjustment circuit is provided to another input terminal of the fourth transconductance amplifier included in the offset correction amplifier.03-31-2011
20110068865V-Band High-Power Transmitter With Integrated Power Combiner - A wireless communications system includes a first multiplexer distribution network fed by a radio frequency input; a plurality of multi-stage power amplifiers fed by the first multiplexer distribution network, wherein each one of the multi-stage power amplifiers includes: a pre-distortion linearizer fed from the first distribution network; a first combiner receiving input from the pre-distortion linearizer; a second combiner; a plurality of power amplifier cells fed by the first combiner and feeding the second combiner; and a second multiplexer distribution network, wherein the second multiplexer distribution network is fed by the second combiner and feeds a radio frequency output.03-24-2011
20120119829REPAIR AMPLIFICATION CIRCUIT AND METHOD FOR REPAIRING DATA LINE - A repair amplification circuit includes a controlling unit, a first operational amplifier, a second operational amplifier, a first switching unit, and a second switching unit. Under a detection mode, the controlling unit generates a detecting signal according to a testing signal transmitted by a unnecessary repair segment in a test picture. Under an operation mode, the controlling unit generates a switching signal according to a repair controlling signal related to the detecting signal. The first switching unit and the second switching unit are controlled by the switching signal, so as to transmit the driving signal to one of the first operational amplifier and the second operational amplifier, and to transmit a positive polarity repairing signal generated by the first operational amplifier or a negative polarity repairing signal generated by the second operational amplifier to a necessary repair segment.05-17-2012
20110025412AMPLIFIER - A amplifier that obtains an output by power combining, comprising: a distribution circuit that distributes an input signal into two signals; a first amplifier circuit that amplifies one of the two signals distributed by the distribution circuit and operates in class AB mode; a second amplifier circuit that amplifies the other of the two signals distributed by the distribution circuit and operates in class B or C mode; a lumped constant circuit that connects outputs of the first and second amplifier circuits; a first impedance transformation circuit connected to an output of the first amplifier circuit; a second impedance transformation circuit connected to an output of the second amplifier circuit, and a quarter wavelength impedance transformation circuit with one end thereof connected to a combining point of output sides of the first and second impedance transformation circuits and with the other end thereof connected to a load (FIG. 02-03-2011
20100295609Method and Apparatus for Providing Dynamic Multi-Stage Amplification in a Medical Device - Methods and apparatus for providing multi-stage signal amplification in a medical telemetry system are provided.11-25-2010
20100301933OUTPUT NETWORKS IN COMBINATION WITH LINC TECHNIQUE - The present invention relates to balanced power amplifier network in combination with outphasing techniques such as Chireix. The object of the present invention is to provide a solution to the problem to combine balanced amplifiers like the current mode class D (CMCD) or class E/F with a LINC network. The main problem is that some power amplifiers have balanced output and the LINC network is single-ended so that a high power low loss transformer that works at several impedance levels is needed, which is hard to realize at cellular frequencies.12-02-2010
20100264984System and Method for Over-Voltage Protection of a Power Amplifier - A system and method for over-voltage protection of a power amplifier is provided. A power amplifier is typically employed in a transmitter to amplify signals prior to transmission via a load; the load may include an antenna or a cable. As a result of an impedance mismatch between the power amplifier and its load, excess power from the power amplifier output fails to reach the load and must be dissipated by one or more transistors in the power amplifier. In severe impedance mismatch conditions, this dissipated power may damage or destroy the transistor(s). An automatic gain control (AGC) is provided for detecting a gain difference between the power amplifier and a replica power amplifier. A gain difference may signal an over-voltage situation. The AGC may be configured to adjust the gain of the power amplifier if a gain difference exists to prevent device damage.10-21-2010
20100259326ACTIVE FORWARD FEED AMPLIFIER - An exemplary embodiment of the feed forward amplifier replaces traditional distributed directional couplers, splitters, and delay lines. Moreover, an exemplary feed forward amplifier architecture combines active implementations of RF couplers, power splitters, and/or time delay elements in a novel fashion allowing for ultra-compact size and broadband performance. In an exemplary embodiment, a feed forward amplifier has a main amplifier path and an error amplifier path. The feed forward amplifier comprises a main amplifier in the main amplifier path, and at least one active vector generator in the error amplifier path. The at least one active vector generator is configured to adjust the phase and amplitude of an error amplifier path signal and an error amplifier is configured to receive the adjusted error amplifier path signal. Furthermore, the adjusted error amplifier path signal and an amplified signal are combined to form the output signal of the feed forward amplifier.10-14-2010
20080284509N-WAY DOHERTY DISTRIBUTED POWER AMPLIFIER - A power amplifier using N-way Doherty structure for extending the efficiency region over the high peak-to-average power ratio of the multiplexing modulated signals such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. In an embodiment, the present invention uses a dual-feed distributed structure to an N-way Doherty amplifier to improve the isolation between at least one main amplifier and at least one peaking amplifier and, and also to improve both gain and efficiency performance at high output back-off power. Hybrid couplers can be used at either or both of the input and output. In at least some implementations, circuit space is also conserved due to the integration of amplification, power splitting and combining.11-20-2008
20100289569Digital hybrid amplifier calibration and compensation method - Methods and hybrid matrix amplifiers are provided. In a method of calibrating a hybrid matrix amplifier of a wireless transceiver, a plurality of signal paths having a digital and an analog portion are toggled such that the analog portion of each of the plurality of signal paths is active only during a corresponding buffer capture interval of a calibration process. The signal paths carry signals to be transmitted by an antenna arrangement. Channel estimates for each of the plurality of signal paths are generated based only on sampling data collected during the corresponding buffer capture interval. The hybrid matrix amplifier is calibrated based on the generated channel estimates.11-18-2010
20110133833Systems and methods providing multi-path low noise amplifiers with seamless switching - Systems and methods which provide a multimode tuner architecture implementing direct frequency conversion are shown. Embodiments provide a highly integrated configuration wherein low noise amplifier, tuner, analog and digital channel filter, and analog demodulator functionality are provided in a single integrated circuit. A LNA of embodiments implements a multi-path configuration with seamless switching to provide desired gain control while meeting noise and linearity design parameters. Embodiments of the invention implement in-phase and quadrature (IQ) equalization and a multimode channelization filter architecture to facilitate the use of direct frequency conversion. Embodiments implement spur avoidance techniques for improving tuner system operation and output using a clock signal generation architecture in which a system clock, sampling clock frequencies, local oscillator (LO) reference clock frequencies, and/or the like are dynamically movable.06-09-2011
20110074504MULTI MODE POWER OUTPUT MODULE AND METHOD OF USE WITH AN RF SIGNAL AMPLIFICATION SYSTEM - A multi mode power output module for use with RF signal amplification system. The multi mode power output module includes at least two power sources; a multiple of output power circuits associated with each of the at least two power sources; a first switch to switch between the at least two power sources, where the first switch provides power from at least two power sources to the output power circuit to amplify an RF signal associated with a lowest power output level; and second switch to switch between an RF output and the multiple of output power circuits to select a output power circuit associated with one of the at least two power sources that is also connected to the RF output.03-31-2011
20110095818METHOD AND APPARATUS FOR ACCURATELY MEASURING CURRENTS USING ON CHIP SENSE RESISTORS - Systems and methods for managing process and temperature variations for on-chip sense resistors are disclosed. The system includes a circuit that can leverage a linear gm circuit in order to provide linear gains (positive gains and/or negative gains). The linearity of the circuit enables compensation for temperature and process variations across an entire range of current (positive to negative). A control signal is generated by using a linear gm amplifier and a replica resistor, which is substantially similar to the on chip resistor. The control signal is used to control the gain of a disparate linear gm amplifier within a compensation circuit, which provides an offset voltage to compensate for the variation in resistance of the on chip resistor.04-28-2011
20100141338Broadband power amplifier - A broadband power amplifier is embodied by realizing a substantially two-section output matching circuit or a substantially two-section input matching circuit using a quarter wave transformer itself as the input matching circuit or the output matching circuit. The broadband power amplifier is advantageous in view of integration and miniaturization due to the low characteristic impedance of the quarter wave transformer and enables both reduction of sizes of chips and circuits due to its simple circuit structure and reduction in cost due to the reduced number of passive devices.06-10-2010
20100225388POWER AMPLIFIER - A Doherty amplifier is provided with a clipping circuit for making signal power flow to ground if the signal power becomes equal to or higher than a predetermine value in order to prevent a carrier amplifier, which is a small amplifier, from being destroyed if the signal power is increased to a sevenfold to tenfold multiple of a ratio of the size of the carrier amplifier to that of a peak amplifier.09-09-2010
20110175677DISTRIBUTED DOHERTY POWER AMPLIFIER - Provided is a distributed Doherty power amplifier exhibiting high efficiency and linearity at a wide range of bandwidths, the distributed Doherty power amplifier including a first amplifier; a second amplifier, which is connected to the first amplifier in parallel; a first shifting unit, which is interconnected between the input of the first amplifier and the input of the second amplifier and inverses the phase of the input of the second amplifier; and a second shifting unit, which is interconnected between the output of the first amplifier and the output of the second amplifier and inverses the phase of the output of the second amplifier, wherein the first amplifier and the second amplifier are Doherty power amplifiers, and each of the Doherty power amplifiers includes a carrier amplifier and a peaking amplifier, which are connected in parallel.07-21-2011
20100060354AMPLIFICATION CIRCUIT - The present invention is aimed at realizing an amplifying circuit whose chip size is prevented from being significantly increased even if the number of compatible frequencies increases, and which has a wide dynamic range when it operates under a low voltage. The amplifying circuit includes a plurality of impedance converting circuits connected to each other by a switching circuit of a first type having a signal cutting-off function, a switching circuit of a second type connected to a path branched from an input side of the switching circuit of the first type, the switching circuit of the second type having a signal cutting-off function, amplifiers connected respectively to an output side of one of the impedance converting circuits in a final stage and to an output side of the switching circuit of the second type, and a control signal generating circuit for controlling connection/disconnection between said switching circuit of the first type and said switching circuit of the second type; wherein either one of the paths is selected to input a signal to one of the amplifiers.03-11-2010
20100026387INTEGRATED DOHERTY TYPE AMPLIFIER ARRANGEMENT WITH HIGH POWER EFFICIENCY - The present invention shows a Doherty type of amplifier arrangement comprising a plurality of parallel unit cells. Each unit cell is of relatively low power. Suitably it comprises a compensation circuit at the input of the main amplifier and peak amplifier stage.02-04-2010
20100019843Method For Controlling A Linear Amplifier And Power Amplifier Arrangement - The present invention relates to a method for controlling an amplifier unit having at least one drive signal input connection 01-28-2010
20100321107HIGH EFFICIENCY TRANSMITTER FOR WIRELESS COMMUNICATION - The present invention provides an amplifier for a wireless transmitter. In one embodiment, the amplifier includes a signal separator for decomposing an input signal into constant envelope signals and amplifier circuits for amplifying the constant envelope signals. The amplifier also includes a combiner for combining the amplified constant envelope signals to form an output signal that is an amplified representation of the input signal. Linear correction circuits are used to apply gain, phase, and/or delay correction to the constant envelope signals. The corrections are determined based upon a feedback portion of the output signal. Pre-distortion circuits are used to apply a non-linear pre-distortion to the constant envelope signals. The non-linear pre-distortion is determined based upon the feedback portion of the output signal.12-23-2010
20090115512DISTRIBUTED DOHERTY AMPLIFIERS - Doherty and distributed amplifier (DA) designs are combined to achieve, wideband amplifiers with high efficiency dynamic range. A modified Doherty amplifier includes a wideband phase shifter providing first and second outputs, a main amplifier coupled to the first output, an auxiliary amplifier coupled to the second output, and a wideband combining network combining the outputs in phase. A multi-stage DA has a main output and a termination port, and a phase delay module and transforming network allowing power at the termination port to be combined in phase with power at the main output. In one combination, one or more stages of the DA may comprise a Doherty amplifier. In another combination, a modified series-type Doherty amplifying system is achieved by cascading main and auxiliary DAs. In any combination, Doherty topology may include a bias control module.05-07-2009
20110156813POWER AMPLIFIER - There is provided a power amplifier that can maintain a constant gain by detecting a level of a signal being input and a level of a signal being output. A power amplifier according to an aspect of the invention may include: an amplification section having at least one amplification unit amplifying an input signal according to an adjustable gain to thereby output the amplified input signal; a detection section detecting signal levels of an input signal and an output signal of the amplification section; and a gain maintaining section controlling a bias power according to a detection result of the detection section so that a gain of the amplification section is maintained within a predetermined gain range.06-30-2011
20110156812MULTI-BAND, MULTI-MODE RF TRANSMIT AMPLIFIER SYSTEM WITH SEPARATE SIGNAL PATHS FOR LINEAR AND SATURATED OPERATION - A device includes: an input for receiving an RF input signal having a signal format selected among a plurality of signal formats, including at least one signal format to be linearly amplified, and at least another signal format be amplified in saturation; at least a first and a second output; a first amplification path from the input to the first output that includes a first amplifier that operates in a linear amplification mode with respect to the RF input signal; a second amplification path from the input port to the second output that includes the first amplifier, and a second amplifier that operates in saturated amplification with respect to the RF input signal; and a path selection device that selectively passes the RF input signal through the first amplification path or the second amplification path in response to the selected signal format of the RF input signal.06-30-2011
20120176195 Asymmetric Multilevel Outphasing Architecture For RF Amplifiers - A radio frequency (RF) circuit includes a power supply configured to generate a plurality of voltages, a plurality of power amplifiers, each having an RF output port and a power supply input port, a switch network having a plurality of input ports coupled to the power supply and a plurality of switch network output ports coupled to the power supply input ports of the plurality of power amplifiers, wherein the switch network is configured to output selected ones of the plurality of voltages from the plurality of switch network output ports, at least two of the switch network output port voltages capable of being different ones of the plurality of voltages, and an RF power combiner circuit having a plurality of input ports coupled to RF output ports of the plurality of power amplifiers and an output port at which is provided an output signal of the RF circuit.07-12-2012
20120176194APPARATUS AND METHOD FOR IMPROVING PERFORMANCE IN DOHERTY AMPLIFIER - An apparatus and an operating method of an asymmetric Doherty power amplifier. A Doherty power amplifier apparatus includes a power divider configured to provide a power signal to a carrier amplifier and a peaking amplifier. The apparatus also includes the carrier amplifier configured to amplify a power of the signal input from the power divider. The apparatus further includes the peaking amplifier configured to have a maximum output power magnitude different from the carrier amplifier and amplify the power of the signal input from the power divider. The apparatus still further includes at least two offset transmission lines disposed at ends of the carrier amplifier and the peaking amplifier and configured to regulate a load impedance. The apparatus also includes an output combiner configured to combine and output outputs of the carrier amplifier and the peaking amplifier of different sizes.07-12-2012
20120056669POWER AMPLIFIER DEVICE WITH REDUCED BULK - An amplification device with reduced bulk including at least one plate parallel to a plane XY and at least two amplifier modules mounted on the plate, each amplifier module including an amplifier element, an input connection waveguide, and an output connection waveguide oriented in one and the same direction X corresponding to a direction of longitudinal propagation, the amplifier element having an input and output axis oriented in a direction Y perpendicular to the direction of propagation X, wherein the input connection waveguides of the amplifier modules are distinct, have different lengths and are mounted in parallel to one another, the output connection waveguides of the amplifier modules are distinct, have different lengths and are mounted in parallel to one another, and the sum of the lengths of the input and output guides of one and the same amplifier module is identical for each amplifier module.03-08-2012
20080204134Power combiner - An embodiment of four-way binary power combiner consists of a first 1:1 transformer that combines a 50 ohm output impedance received from an output of a first power amplifier and a 50 ohm output impedance received from an output of second power amplifier to provide a 25 ohm first transformer output impedance at a first transformer output. A first 100 ohm difference resistor is connected between the first power amplifier output and the second amplifier output. The second 1:1 transformer combines a 50 ohm output impedance received from an output of a third power amplifier and a 50 ohm output impedance received from an output of a fourth power amplifier to provide a 25 ohm second transformer output impedance at a second transformer output. A second 100 ohm difference resistor is connected between the third power amplifier output and the fourth power amplifier output. A 50 ohm difference resistor is connected between the first transformer output and the second transformer output. A third transformer combines the 25 ohm first transformer output impedance and the 25 ohm second transformer output impedance to provide a 12.5 ohm output impedance at a third transformer output that is adapted for direct connection to a load.08-28-2008
20120007671APPARATUS FOR AUTOMATICALLY SEPARATING AND DETECTING NOISE RADIO WAVES - An output signal SHS is secondarily amplified by a high-frequency amplifier AMP01-12-2012
20120062318METHOD AND APPARATUS FOR TRANSFORMER POWER COMBINER AND DYNAMIC POWER CONTROL FOR OUTPHASING POWER AMPLIFIERS - A method, system, apparatus and article are described for optimizing transformer power combiners and for dynamically controlling power for outphasing power amplifiers. In some embodiments, for example, an apparatus may comprise one or more outphasing power amplifiers, one or more phase modulator modules coupled to and operative to dynamically control the one or more outphasing power amplifiers, and one or more power combiners coupled to and operative to combine outputs from the one or more outphasing power amplifiers, wherein the one or more power combiners comprise transformer power combiners arranged to combine outphasing signals using a primary inductor and differential signals using a secondary inductor. Other embodiments are described and claimed.03-15-2012
20120154033AMPLIFYING APPARATUS AND DISTORTION COMPENSATION METHOD - An amplifying apparatus includes: a plurality of amplifiers; a linear combiner receiving a plurality of leakage signals resulting from cross leakage between outputs of the plurality of amplifiers and performing a linear combination of level values of the plurality of leakage signals to generate a plurality of linear combination signals; and an output calculator calculating real level values of a plurality of output amplified signals of the amplifiers from level values of the linear combination signals.06-21-2012
20100308907Type of High-Performance DC Amplification Device for Bioelectrical Signal Collection - This invention relates to a high-performance DC amplifying device for bioelectrical signal collection, including the sequentially linked input protective/filter circuit, input buffer circuit, instrumentation amplification circuit, RC low-pass filter circuit, analog-digital conversion and peripheral circuit and CPU, as described as below: the input protective/filter circuit collects the bioelectrical signal and sends such signal to the input buffer circuit and then allows it pass through the instrumentation amplification circuit, RC low-pass filter circuit and analog-digital conversion and peripheral circuit in order. For such device, CPU controls the operation of analog-digital conversion and peripheral circuit. This invention converts the impedance of bioelectrical signal firstly and then applies the common-mode signal rejection to the amplified signal, with the high-frequency noise filtered; such signal is treated for the secondary amplification by the single-ended-to-differential operational amplifier—the noise and common-mode rejection ratio and other indicators of such signal after analog-digital conversion reach a very high level and the baseline is very stable; the dynamic range of signal input is large and it is not saturated easily. With fewer parts needed, the reliability of such device is enhanced.12-09-2010
20110084761Output Amplifier of Source Driver - An output amplifier includes an amplifier circuit, a driving stage circuit, an output stage circuit, a first unity gain buffer, and a second unity gain buffer. The amplifier circuit provides an inverted signal and a non-inverted signal, in which the amplifier circuit amplifies an input pixel signal to generate the inverted signal and the non-inverted signal. The output stage circuit passes a supply voltage or a ground voltage to the pixel circuit according to the inverted signal and the non-inverted signal. The driving stage circuit passes the supply voltage or the ground voltage to the pixel circuit. The first unity gain buffer enhances and passes the inverted signal from the amplifier circuit to the driving stage circuit. The second unity gain buffer passes and enhances the non-inverted signal from the amplifier circuit to the driving stage circuit.04-14-2011
20100194473POWER AMPLIFIER WITH RECONFIGURABLE DIRECT CURRENT COUPLING - Embodiments of circuits, systems, and methods relating to a power amplifier with a reconfigurable direct current coupling are disclosed. Other embodiments may be described and claimed.08-05-2010
20120154034DOHERTY AMPLIFIER SYSTEM AND TRANSMITTER USING THE SAME - According to an embodiment, a Doherty amplifier system has a first Doherty amplifier and a second Doherty amplifier. The first Doherty amplifier operates in a SISO communication mode and in a MIMO communication mode. The first Doherty amplifier comprises a first carrier amplifier and a first peak amplifier. The second Doherty amplifier operates in the MIMO communication mode but not operates in the SISO communication mode. The second Doherty amplifier comprises a second carrier amplifier and a second peak amplifier. A distance between the first carrier amplifier and the second carrier amplifier is less than any of a distance between any of the first carrier amplifier and the second peak amplifier and any of the first peak amplifier and the second peak amplifier. In the SISO communication mode, heat generated by the first Doherty amplifier is conducted to the second Doherty amplifier to warm up the second Doherty amplifier.06-21-2012
20110080215FINAL STAGE THREE-WAY POWER COMBINING AMPLIFYING CIRCUIT APPLIED TO POWER AMPLIFIER OF MOBILE COMMUNICATIONS BASE STATION SYSTEM - The invention relates to a final stage three-way power combining amplifying circuit applied to power amplifier of a mobile communications base station system. The circuit includes at least a first power divider, a power combiner, a Doherty amplifier and a Class AB amplifier, as well as some transmission lines and phase-shift lines. A first output port of the first power divider is connected to a first input port of the power combiner via a first phase-shift line and the Doherty amplifier by concatenating them with transmission lines. A second output port of the first power divider is connected to an input terminal of a Class AB amplifier via a transmission line, an output terminal of the Class AB amplifier is connected to a second input port of the power combiner via a microstrip line, and the output terminal of the power combiner outputs an amplified radio frequency signal. The invention can meet the requirements of both high efficiency and low cost. Meanwhile, the reliability and stability of the power amplifying circuit are also ensured.04-07-2011
20120119830MODULE FOR MODULATION AND AMPLIFICATION - The present application relates to a module comprising at least two amplifiers. The first amplifier is configured to amplify an inphase signal. The second amplifier is configured to amplify a quadrature signal. The module comprises a combiner configured to combine the at least two amplified signals. The module comprises a phase reversal unit configured to provide at least two amplified signals comprising a maximum phase difference of 2 p.05-17-2012
20100289570AMPLIFIER CIRCUIT, ELECTRONIC DEVICE, METHOD FOR CONFIGURING AN AMPLIFIER CIRCUIT - An electronic circuit comprises one or more upstream stages and two or more downstream stages positioned, in a processing direction of the signals, downstream of the upstream stage. A plurality of configurable connections is present between the upstream stage and the downstream stages. The connections are configurable to provide a predetermined communication path between a respective upstream stage and one or more selected downstream stage selected from the two or more downstream stages and to communicatively disconnect the upstream stage from not selected downstream stages. The electronic circuit may for example be an amplifier circuit.11-18-2010
20100244950AMPLIFIER PRE-DISTORTION SYSTEMS AND METHODS - A method of optimizing performance of a multiple path amplifier includes: splitting an input signal to derive a respective sub-signal for each branch of the multiple path amplifier; independently pre-distorting each sub-signal using a known performance characteristic of its associated branch of the multiple path amplifier; and supplying each pre-distorted sub-signal to its associated branch of the multiple amplifier.09-30-2010
20100244949Composite Amplifier, a Radio Terminal and a Method for Improving the Efficiency of the Composite Amplifier - The present invention relates to a composite amplifier (09-30-2010
20100244948MULTIPLE-INPUT AND MULTIPLE-OUTPUT AMPLIFIER USING MUTUAL INDUCTION IN THE FEEDBACK NETWORK - The invention relates to an amplifier capable of producing a plurality of output signals, these output signals being controlled by a plurality of input signals. A multiple-input and multiple-output amplifier of the invention comprises includes 4 signal input terminals, 4 signal output terminals, 4 active sub-circuits and a feedback network. Each active sub-circuit has a sub-circuit input terminals connected to one of the signal input terminals, a sub-circuit output terminal connected to one of the signal output terminals and a sub-circuit common terminal. The feedback network uses mutual induction between windings. The feedback network has terminals connected to the sub-circuit common terminal of the active sub-circuits. The feedback network presents an impedance matrix producing a negative feedback such that the transfer admittance matrix of the multiple-input and multiple-output amplifier approximates a given admittance matrix.09-30-2010
20120126890POWER AMPLIFIER - The invention relates to improving the performance of load modulation power amplifiers through the use of coupled transmission line-based power combiners. Exemplary embodiments disclosed include a power amplifier comprising an input connected to first and second amplifier stages and an output stage configured to combine phase shifted amplified outputs from the first and second amplifier stages and to provide an amplified signal at an output of the power amplifier, wherein the output stage comprises coupled first and second transmission lines connected between the output of the first amplifier stage and an output load connection.05-24-2012
20120126891POWER AMPLIFICATION APPARATUS - A power amplification apparatus includes a first amplifier turned on at a preset low input power; and a second amplifier connected in parallel with the first amplifier and turned off at a low input power due to a relatively low bias current. Output capacitors of the first amplifier and the second amplifier are compensated for by inductors or microstrip lines of dc power supply paths. An output matching circuit of the first amplifier includes a λ/4 transformer. An output matching circuit of the second amplifier has the phase of 0°. Input matching circuits of the first amplifier and the second amplifier include delay compensation circuits. The output matching circuit of the first amplifier, the output matching circuit of the second amplifier, and a final output matching circuit have the same impedance transformation rates.05-24-2012
20110181353TWO-CHANNEL OPERATIONAL AMPLIFIER CIRCUIT - A two-channel operational amplifier circuit includes a first operational amplifier and a second operational amplifier. In a first frame period, the two-channel operational amplifier circuit switches a first input stage, a first gain stage and a first output stage to work between a working voltage and a half working voltage, and switches a second input stage, a second gain stage and a second output stage to work between the half working voltage and a ground voltage. In a second frame period, the two-channel operational amplifier circuit switches the second input stage and the second gain stage to work between the working voltage and the half working voltage, and switches the first input stage and the first gain stage to work between the half working voltage and the ground voltage.07-28-2011
20120212292MODIFIED DYNAMIC LOAD SCALING (MDLS) TECHNIQUE FOR IMPLEMENTING HIGH EFFICIENCY LOW POWER MODE OPERATION - A power amplification circuit having three modes of operation and a single switch is disclosed. Only one switch is used to control three different load impedance levels, one load impedance level for each mode of operation. The remaining “switching” results from selectively biasing each power amplification path by turning ON or OFF amplifiers. A series L-C and a switch are used to control the load impedance. Additional modes of operation may also be created without requiring any additional switch. Further, multiple modes of operation may be implemented using no switches.08-23-2012
20120075018POWER AMPLIFIER AND TRANSMITTER - A power amplifier is provided, which includes a power dividing unit, a first power amplification tributary, a second power amplification tributary, and an impedance conversion unit. Input ends of the first power amplification tributary and the second power amplification tributary are coupled to two output ends of the power dividing unit respectively. An output end of the first power amplification tributary is coupled to an output end of the second power amplification tributary through the impedance conversion unit. Rated power of a peak power amplifier in the second power amplification tributary is greater than that of a main power amplifier in the first power amplification tributary. The beneficial effects of the present invention lie in that larger back-off exists at the peak of an efficiency curve of the power amplifier, and in the case that power is back-off, efficiency of the power amplifier is improved.03-29-2012
20120075017ATTENUATOR - An attenuator includes a first 3 dB bridge, a second 3 dB bridge and an amplifying tube group, where the amplifying tube group includes a first amplifying tube and a second amplifying tube, a drain of the first amplifying tube is connected to a first output port of the first 3 dB bridge, a source of the first amplifying tube is connected to a first input port of the second 3 dB bridge, a drain of the second amplifying tube is connected to a second output port of the first 3 dB bridge, and a source of the second amplifying tube is connected to a second input port of the second 3 dB bridge; where gates of the first amplifying tube and the second amplifying tube are respectively connected to the same voltage source or different voltage sources having the same voltage.03-29-2012
20120313700Predistorter For A Multi-Antenna Transmitter - Methods and apparatus are disclosed for predistorting input data signals to a MIMO transmitter to compensate for distortions introduced by the MIMO transmitter. Distortions introduced to data signals by a MIMO transmitter include crosstalk between multiple transmit paths and non-linearities introduced by power amplifiers. In an exemplary predistorter, post-amplifier crosstalk is compensated for by a first matrix operation before distortions introduced by power amplifiers are predistorted by power amplifier predistorters. After the power amplifier predistorters, pre-amplifier crosstalk is compensated for by a second matrix operation.12-13-2012
20120223775DOHERTY AMPLIFIER - The embodiment relates to a Doherty amplifier, wherein in order to perform impedance matching. The embodiment comprises an impedance converter and a connector. The impedance converter includes a plurality of lines having different lengths and disposes between an output end of a carrier amplifier and an output end of a peaking amplifier. The connector connects a line selected from the plurality of lines having different lengths of the impedance converter to the output end of the carrier amplifier and to the output end of the peaking amplifier.09-06-2012
20090021301Efficient Composite Amplifier - A detuned composite amplifier includes a nonlinear drive function (01-22-2009
20120299644SYSTEM AND A METHOD FOR AMPLIFYING A SIGNAL BY MULTIPLE NON-LINEAR POWER AMPLIFIERS - A system and a method are provided. The system may include (A) a measurement circuit arranged to measure at least a current power level of the input signal; (B) multiple non-linear power amplifiers; wherein different non-linear power amplifiers are associated with different power ranges; (C) a control circuit arranged to: (a) select at least one selected non-linear power amplifier to be used to amplify a second signal based on at least: (i) the current power level of an input signal; (ii) an association between the different power ranges and the different non-linear power amplifiers; (iii) an identity of at least one previously selected non-linear power amplifier; and (b) assist in an activation of the at least one selected non-linear power amplifier; and (D) a signal processing module, configured to process the input signal to provide the second signal such as to at least partially compensate for a non-linearity of each of the at least one selected non-linear power amplifier.11-29-2012
20120229207PULSE WIDTH MODULATION SIGNAL GENERATING CIRCUIT AND AMPLIFIER CIRCUIT WITH BEAT FREQUENCY CANCELLATION CIRCUIT - A beat frequency cancellation circuit, for an amplifier, includes a coupling device connected between two signal processing paths of the amplifier for compensating for beat frequency effects of output signals between the signal processing paths.09-13-2012
20100327970Transmission Line Distributed Oscillator - In one embodiment, an integrated circuit antenna array includes: a substrate, a plurality of antennas adjacent the substrate; and an RF network adjacent the substrate, the RF feed network coupling to a distributed plurality of amplifiers integrated with the substrate, wherein the RF feed network and the distributed plurality of amplifiers are configured to form a resonant network such that if a timing signal is injected into an input port of the RF network, the resonant network oscillates to provide a globally synchronized RF signal to each of the antennas.12-30-2010
20100327969POWER AMPLIFIER HAVING PARALLEL AMPLIFICATION STAGES AND ASSOCIATED IMPEDANCE MATCHING NETWORKS - An amplification device includes a series combination of a driver stage, an output terminal matching network, and a secondary amplification stage. The driver stage includes a driver amplifier and an output matching network. The secondary amplification stage includes a parallel combination of an impedance transformation network and a main amplification stage. The main amplification stage includes a plurality of main amplification branches in parallel with each other, and an input matching network in series with the parallel combination. Each main amplification branch includes a main amplifier, and input and output impedance matching networks. A control circuit supplies activation signals to the main amplification branches to selectively turn them on and off. The device has no switches in the path of the signal that is amplified. In at least one operating mode, the control circuit turns on at least two of the main amplification branches at the same time.12-30-2010
20080297245DELAY MODULATOR PRE-DISTORTION CIRCUIT FOR AN AMPLIFIER - A circuit for pre-distorting a signal input to an amplifier includes a signal divider operable for dividing an input signal into signal portions that travel in a primary path and a secondary path. A delay element in each of the primary and secondary paths introduces a group delay to the signal portions in the respective paths. A signal combiner is operable for combining the signals in the respective paths into a combined output signal. A variable gain circuit is arranged in each of the primary and secondary paths. The variable gain circuit is operable to vary the level of the input signal in each path and thereby modulate the overall phase delay of the combined output signal.12-04-2008
20120319772FLEXIBLE MULTI-CHANNEL AMPLIFIERS VIA WAVEFRONT MUXING TECHNIQUES - This invention aims to present a smart and dynamic power amplifier module that features both power combining and power sharing capabilities. The proposed flexible power amplifier (PA) module consists of a pre-processor, N PAs, and a post-processor. The pre-processor is an M-to-N wavefront (WF) multiplexer (muxer), while the post processor is a N-to-M WF de-multiplexer (demuxer), where N≧M≧2. Multiple independent signals can be concurrently amplified by a proposed multi-channel PA module with a fixed total power output, while individual signal channel outputs feature different power intensities with no signal couplings among the individual signals. In addition to basic configurations, some modules can be configured to feature both functions of parallel power amplifiers and also as M-to-M switches. Other programmable features include configurations of power combining and power redistribution functions with a prescribed amplitude and phase distributions, as well as high power PA with a linearizer.12-20-2012
20120326780COUPLER AND AMPLIFIER ARRANGEMENT - A coupler comprises a first line (12-27-2012
20120286860Systems and Methods for Minimizing Phase Deviation and/or Amplitude Modulation (AM)-to-Phase Modulation (PM) Conversion for Dynamic Range, Radio Frequency (RF) Non-Linear Amplifiers - Embodiments of the invention may provide systems and methods for minimizing phase deviation and/or amplitude modulation (AM)-to-phase modulation (PM) conversion for dynamic range, radio frequency (RF) non-linear amplifiers. In order to provide high dynamic range with reduced phase error, embodiments of the invention may utilize two separate paths for processing a signal. In particular, an input signal may be sampled and divided into each path. The first signal path may be used to shape a signal, and in particular, a voltage waveform at the load. The second signal path may be used for generating negative capacitances corresponding to the voltage waveform at the load. By combining the two signals at the load, a high-dynamic range, high-frequency, non-linear amplifier can be achieved that reduces phase error resulting from amplitude fluctuations with a relatively low unity-gain frequency (f11-15-2012
20130021095Power-Amplifier Arrangement - A power-amplifier arrangement (01-24-2013
20130021094CIRCUIT FOR OPTIMIZING A POWER MANAGEMENT SYSTEM DURING VARYING LOAD CONDITIONS - A circuit for optimizing a power management system. The circuit includes a first amplifier. The first amplifier is responsive to a first reference signal and operable to supply a first load current. The circuit also includes a second amplifier coupled to the first amplifier. The second amplifier is responsive to a second reference signal and operable to supply a second load current. The second load current is lower in magnitude than the first load current, thereby enabling the first amplifier to operate during a first load condition, and the second amplifier to operate during the first load condition and a second load condition. Further, the circuit includes a resistive element coupled to the first amplifier and the second amplifier, to isolate the first amplifier from the second amplifier.01-24-2013
20130135044HIGH-FREQUENCY POWER AMPLIFIER WITH DOHERTY EXTENSION - A high-frequency power amplifier comprises a broadband amplifier (05-30-2013
20130113554SIGNAL SPLITTING APPARATUS SUITABLE FOR USE IN A POWER AMPLIFIER - Disclosed is a signal splitting apparatus useable in a power amplifier having two or more power amplifiers. The apparatus includes a direct gain component; and a derived gain component connected to the direct gain component. The derived gain component derives the derived gain from the direct gain by imposing a constraint which is valid over the entire dynamic range of the input signal, e.g. the sum of the power of the direct split signal and the derived split signal are constrained to be substantially equal to the power of the input signal. The use of combining additional direct gain and derived gain components, as well as a delay element, are disclosed so as to enable n-component splitting that for adaptation to different applications by the use of suitable coefficients.05-09-2013
20130127529AUTOMATIC GAIN CONTROL DEVICE - A first frequency converter generates an I-system baseband signal based on a high-frequency received signal and a first local signal with a predetermined frequency band. A second frequency converter generates a Q-system baseband signal based on a high-frequency received signal and a second local signal 90° out of phase with the first local signal. First and second AD converters convert respective amplified I-system and Q-system baseband signals to digital data. First and second over-range detecters detect the over-range of the first and the second CAD converters. An automatic gain controller selects the gain based on the detection information of the over-range and the respective I-system and Q-system baseband signals. An offset setter gives a predetermined offset to the selected gain, and sets a gain after the offset with respect to the first or the second variable amplifier.05-23-2013
20130127528POWER AMPLIFIER AND AMPLIFICATION METHOD THEREOF - Provided are a power amplifier and a method thereof. The power amplifier power amplifier includes: a main amplifying unit receiving power; an auxiliary amplifying unit connected in parallel to the main amplifying unit; and a balloon transformer combined with the main amplifying unit and the auxiliary amplifying unit. Respectively different bias voltages are applied to the main amplifying unit and the auxiliary amplifying unit.05-23-2013
20130135043MULTIMODE RF AMPLIFIER SYSTEM - Multimode radio frequency (RF) amplifier systems and techniques are disclosed. In one embodiment, a multimode radio frequency (RF) amplifier system has a first RF amplifier and a second RF amplifier. The first RF amplifier may support a first RF communication standard. The second RF amplifier may support a second RF communication standard. The first RF amplifier includes an auxiliary circuit. The auxiliary circuit may provide a service or a utility to a second RF amplifier. For example, the auxiliary circuit may generate a supply voltage to power the second RF amplifier.05-30-2013
20080197923SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE AND HIGH-FREQUENCY POWER AMPLIFIER MODULE - Upon application of an on-state voltage to a control terminal, an antenna switch provided between an antenna terminal and a transmission terminal is turned on, and a transmission signal of a PCS/DCS system passes from the transmission terminal through the antenna terminal. At this time, a booster circuit, to which a part of the transmission signal is supplied, generates at an output terminal a boost voltage higher than a control voltage output from a controller due to the rectification of diodes, and applies the same to the gate of a transistor circuit of the antenna switch. Since in the booster circuit a resistor is coupled to the output terminal, the passage through resistors of an input transmission power in an RF signal path is only the passage through one resistor, thus reducing the attenuation of the transmission signal and providing an excellent insertion loss characteristic.08-21-2008
20080197922AMPLIFIER DEVICE FOR AN ANTENNA OPERABLE IN AT LEAST ONE MODE - An amplifier device for a mode antenna has a number of amplifiers and a number of outputs. An input signal is fed to each amplifier, which is amplified by the respective amplifier into an amplified input signal. The amplified input signals are fed to an output matrix arranged after the amplifiers. Respective output signals are emitted by the output matrix at the outputs. The output matrix causes each amplified input signal to supply an output signal contribution for each output signal. Each output signal contribution of each output signal has an output-side contribution offset in relation to the corresponding amplified input signal, which depends on the amplified input signal that supplied the output signal contribution, and the output signal to which the output signal contribution contributes. The amplifier device is especially able to be used in a transmit arrangement for radio-frequency signals.08-21-2008
20130147549AMPLIFIER - An amplifier includes a signal processing circuit configured to generate an orthogonal signal orthogonal to an input signal; a first D/A converter configured to convert the orthogonal signal into a first analog signal; a second D/A converter configured to convert the input signal into a second analog signal; and an analog computing circuit configured to generate a constant envelope signal based on the first analog signal from the first D/A converter and the second analog signal from the second D/A converter.06-13-2013
20130043944CASCADED CONVERGED POWER AMPLIFIER - A first radio frequency (RF) power amplifier (PA) stage, a second RF PA stage, and an alpha RF switch are disclosed. The first RF PA stage provides a first RF output signal. During a first alpha mode, the alpha RF switch forwards the first RF output signal to the second RF PA stage, such that the first RF PA stage functions as a driver stage and the second RF PA stage functions as a final stage. However, during one of a group of alpha modes, the alpha RF switch forwards the first RF output signal to provide a corresponding one of a group of alpha transmit signals, such that the first RF PA stage functions as a final stage. Further, the first alpha mode is not one of the group of alpha modes.02-21-2013
20130099860HIGH FREQUENCY POWER AMPLIFIER - A Doherty amplifier includes an impedance transformer located between a load and a signal combining point of a carrier amplifier and a peak amplifier. The impedance transformer subjects, at frequencies including a fundamental frequency and at least a second harmonic frequency thereof, an impedance Zo of the load to impedance transformation into a value lower than Zo, for example, (½)×Zo, over a wide band or a plurality of frequency bands.04-25-2013
201003151623-WAY DOHERTY AMPLIFIER WITH MINIMUM OUTPUT NETWORK - A 3-way Doherty amplifier has an amplifier input and an amplifier output. The amplifier has a main stage, a first peak stage and a second peak stage. The amplifier has an input network connecting the amplifier input to the inputs of the stages, and an output network connecting the stages to the amplifier output. The output network implements a phase shift of 90° between the output of the main stage and the amplifier output; a phase shift of 180° between the output of the first peak stage and the amplifier output; and a phase shift of 90° between the third output and the amplifier output.12-16-2010
20100315161Power Inductor - A power inductor comprising a tube and one or more coils. The tube in one embodiment is generally cylindrical and comprises a liquid-cooled center portion, the tube further comprising an inner diameter, an outer diameter, and an outer surface. The coils of one embodiment are coupled to the tube outer surface, with each of the one or more coils having a coil thickness, and at least a portion of a coil turn.12-16-2010
20120280748MULTI-PORT AMPLIFICATION DEVICE THAT SELF-COMPENSATES IN THE PRESENCE OF TRAFFIC - A system for multi-distributed amplification of a communication signal including at least one plurality N of input pathways connected to an input Butler matrix which delivers as output N distributed signals, a plurality N of tube amplifiers which receive as input said distributed signals and produce as output N amplified and phase-shifted signals each of a complex gain Gi and an output Butler matrix which receives as input said amplified signals and produces as output N output signals, wherein the phase error and amplitude error are self-compensated in the presence of traffic.11-08-2012
20120280747FEEDBACK BASED BUCK TIMING OF A DIRECT CURRENT (DC)-DC CONVERTER - At least a first shunt switching element and switching control circuitry of a first switching power supply are disclosed. At least the first shunt switching element is coupled between a ground and an output inductance node of the first switching power supply. The first switching power supply provides a buck output signal from the output inductance node. The switching control circuitry selects one of an ON state and an OFF state of the first shunt switching element. When the buck output signal is above a first threshold, the switching control circuitry is inhibited from selecting the ON state. The first switching power supply provides a first switching power supply output signal based on the buck output signal. By using feedback based on the buck output signal, the switching control circuitry may refine the timing of switching between series switching elements and shunt switching elements to increase efficiency.11-08-2012
20120280746DC-DC CONVERTER SEMICONDUCTOR DIE STRUCTURE - A direct current (DC)-DC converter having a DC-DC converter semiconductor die and an alpha flying capacitive element is disclosed. The DC-DC converter semiconductor die includes a first series alpha switching element, a second series alpha switching element, a first alpha flying capacitor connection node, which is about over the second series alpha switching element, and a second alpha flying capacitor connection node, which is about over the first series alpha switching element. The alpha flying capacitive element is electrically coupled between the first alpha flying capacitor connection node and the second alpha flying capacitor connection node. By locating the first alpha flying capacitor connection node and the second alpha flying capacitor connection node about over the second series alpha switching element and the first series alpha switching element, respectively, lengths of transient current paths may be minimized, thereby reducing noise and potential interference.11-08-2012
20130154731N WAY DOHERTY AMPLIFIER - A device including a Doherty amplifier, the Doherty amplifier having an amplifier input and output. At least one main amplifier is coupled to the input via a main input impedance and to the output via a main output impedance and additional amplifiers, each amplifier being coupled to the input via respective additional input impedances. Each additional amplifier has a respective additional amplifier output coupled to a respective pair of additional impedances connected in series and having a respective connection node between them. The device also has a first additional amplifier having their respective additional impedances coupled between its respective output and the amplifier output, the pair of additional impedances having first and second impedances, the first impedance being connected to the respective additional amplifier output and to the connection node, the second impedance being coupled between their respective connection node and the connection node of the previous additional amplifier.06-20-2013
20130154730USING A NEW SYNCHRONIZATION SCHEME FOR A MULTI-CHANNEL CLASS-D AMPLIFIER - Various embodiments are described herein for a multi-channel class-D amplifier and an associated processing method. In general, the multi-channel class-D amplifier comprises a signal source that provides a plurality of input signals and generates synchronization information; and a plurality of class-D amplifier channel modules, each class-D amplifier channel module being configured to process a corresponding input signal from the plurality of input signals according to the synchronization information to produce an output signal. The switching frequencies employed by the plurality of class-D amplifier channel modules are substantially similar to one another and the processing of the plurality of input signals is offset in time across the plurality of class-D amplifier channel modules.06-20-2013
20130181773MULTI-WAY DOHERTY AMPLIFIER - The present disclosure provides a multi-way Doherty amplifier that includes an amplifier input, an amplifier output, a main amplifier having an input connected to the amplifier input, and at least a first and a second peak amplifier. In the Doherty amplifier, an input of the first peak amplifier is connected to the amplifier input or an output of the main amplifier, and an input of the second peak amplifier is connected to the amplifier input, the output of the main amplifier or an output of the first peak amplifier. The Doherty amplifier further comprises a first impedance converter connected between the output of the main amplifier and the amplifier output, a second impedance converter connected between the output of the first peak amplifier and an output of the second peak amplifier, and a third impedance converter connected between the output of the second peak amplifier and the amplifier output.07-18-2013
20120286861Doherty Amplifier and Method for Operation Thereof - An amplifier having a Doherty-type architecture and a method for operation thereof are provided. The amplifier comprises a main amplifier path comprising a main amplifier, an auxiliary amplifier path comprising an auxiliary amplifier, and an signal preparation unit configured to develop a main amplifier input signal for the main amplifier path and an auxiliary amplifier input signal for the auxiliary amplifier path based on an amplifier input that is to be amplified and a transition threshold associated with the amplifier input. By driving the main and auxiliary amplifiers as a function of the transition threshold, the gain of the Doherty-type amplifier may be increased.11-15-2012
20120013400Current Control Circuit, Class AB Operational Amplifier System and Current Control Method - A current control circuit for controlling a bias current of a class AB operational amplifier includes: a low current source, for generating a low bias current; a high current source, for generating a high bias current, which is greater than the low bias current; and a comparing and selecting unit, coupled to an output terminal of the class AB operational amplifier, for selecting one of the low bias current and the high bias current to output as the bias current according to an output voltage of the class AB OP.01-19-2012
20130093511APPARATUS AND METHOD FOR IMPROVING EFFICIENCY IN POWER AMPLIFIER - An apparatus and method for enhancing the whole efficiency of power amplification in a supply modulated amplifier are provided. The power amplification apparatus includes a controller, a Doherty power amplifier, and a supply modulated amplifier. The controller selects a power amplifier among the Doherty power amplifier and the supply modulated amplifier. The Doherty power amplifier amplifies a power of a transmission signal when the Doherty power amplifier is selected by the controller. The supply modulated amplifier amplifies the power of the transmission signal using a supply voltage determined considering the amplitude of the transmission signal, when the supply modulated amplifier is selected by the controller.04-18-2013
20120235734ENHANCED DOHERTY AMPLIFIER - The disclosure relates to an enhanced Doherty amplifier that provides significant performance improvements over conventional Doherty amplifiers. The enhanced Doherty amplifier includes a power splitter, combining node, a carrier path, and a peaking path. The power splitter is configured to receive an input signal and split the input signal into a carrier signal provided at a carrier splitter output and a peaking signal provided at a peaking splitter output. The carrier path includes carrier power amplifier circuitry, a carrier input network coupled between the carrier splitter output and the carrier power amplifier circuitry, and a carrier output network coupled between the carrier power amplifier circuitry and the Doherty combining node. The peaking path includes peaking power amplifier circuitry, a peaking input network coupled between the peaking splitter output and the peaking power amplifier circuitry, and a carrier output network coupled between the power amplifier circuitry and the Doherty combining node.09-20-2012
20120112832RADIO FREQUENCY SWITCH AND RADIO FREQUENCY MODULE - The present invention provides a radio frequency switch and a radio frequency module having excellent distortion characteristics without causing a further insertion loss and a greater chip size. The radio frequency switch includes: input-output terminals which are for inputting and outputting a radio frequency signal; a basic switching unit provided between two of the input-output terminals; and a control terminal which receives a control voltage for controlling conduction and interruption of the basic switching unit. The basic switching unit includes field effect transistors (FETs) connected in multiple stages, each of the FETs being a meandered FET having a meandered gate electrode, and among the FETs, one of the FETs has a finger length shorter than finger lengths of rest of the FETs, the one of the FETs electrically located closest to one of the input-output terminals.05-10-2012
20090066413Method and Apparatus for Diminishing Mismatch Effects Between Switched Signals - A circuit for diminishing mismatch effects between at least two switched signals includes at least three processing circuits configured to receive at least two switched signals such that each of the switched signals is associated with one of the processing circuits leaving at least one unassociated processing circuit. A controller circuit is configured to switch one of the switched signals to be associated with one of the unassociated processing circuit(s) upon at least one specified interval such as, for example, at a transition of the switched signal. The circuit may be incorporated into an audio amplifier configured to provide information carried on the switched signals to one or more speakers that provide an audio output. A one-processor circuit approach includes switching frames of a switched signal between positive and negative inputs of a processor circuit to average out errors introduced by the processor circuit.03-12-2009
20100214017TUNING MULTIPORT AMPLIFIERS - A method of tuning a multiport amplifier and a multiport amplifier are provided. The multiport amplifier comprises an even number of microwave power amplifiers arranged in parallel, a series of input ports and a series of output ports, the input ports being connected to the amplifiers by a series of input hybrids and the output ports being connected to the amplifiers by a series of output hybrids, whereby an input signal at any given input port is amplified by all amplifiers, and then recombined into an output signal at a given output port. The method includes the steps of matching each amplifier in a pair of adjacent amplifiers to the other to an extent which is greater than matching between non paired amplifiers while still being able to ensure acceptable signal isolation between all output ports. This method of tuning results in an MPA well suited to the requirements of certain frequency re-use schemes and which has a significantly reduced set-up and test time.08-26-2010
20100271121MULTIPORT AMPLIFIERS IN COMMUNICATIONS SATELLITES - In order to maintain isolation of signals within a multiport amplifier of a communications satellite and to reduce cross-talk components, by monitoring communications signals passing through the multiport amplifier, output signals of the multiport amplifier are sensed and downconverted to baseband, and applied to an emulator mechanism of the multiport amplifier. The emulator mechanism comprises a reverse matrix of the multiport amplifier, which recovers the input signals of the multiport amplifier together with cross-talk components, and a digital signal processor which carries out a frequency analysis of the cross-talk components by means of an EFT, and employs a digital model of the multiport amplifier to determine the state of the multiport amplifier which gives rise to such cross-talk components. The digital signal processor may be located at a ground station to which communication is made via a telemetry link.10-28-2010

Patent applications in class WITH PLURAL AMPLIFIER CHANNELS (E.G., PARALLEL AMPLIFIER CHANNELS)

Patent applications in all subclasses WITH PLURAL AMPLIFIER CHANNELS (E.G., PARALLEL AMPLIFIER CHANNELS)