Class / Patent application number | Description | Number of patent applications / Date published |
330192000 | OUTPUT NETWORKS | 42 |
20100060357 | RF POWER AMPLIFIER SYSTEM WITH IMPEDANCE MODULATION - A power amplifier controller circuit controls an adjustable impedance matching network at the output of a power amplifier to vary its load line to improve the efficiency of the RF PA. The PA controller circuit comprises an amplitude control loop that determines an amplitude correction signal. The amplitude loop is configured to control or correct for distortion from the adjustable matching network based upon the amplitude correction signal. | 03-11-2010 |
20100231296 | Radio Frequency Power Delivery System - A system and method are provided for delivering power to a dynamic load. The system includes a power supply providing DC power having a substantially constant power open loop response, a power amplifier for converting the DC power to RF power, a sensor for measuring voltage, current and phase angle between voltage and current vectors associated with the RF power, an electrically controllable impedance matching system to modify the impedance of the power amplifier to at least a substantially matched impedance of a dynamic load, and a controller for controlling the electrically controllable impedance matching system. The system further includes a sensor calibration measuring module for determining power delivered by the power amplifier, an electronic matching system calibration module for determining power delivered to a dynamic load, and a power dissipation module for calculating power dissipated in the electrically controllable impedance matching system. | 09-16-2010 |
20100237939 | ADAPTIVE OPERATIONAL TRANSCONDUCTANCE AMPLIFIER LOAD COMPENSATION - A buffer varies the size of its output stage in response to a varying capacitive load. The capacitive load may vary in a predictable or a random manner. The buffer includes an operational amplifier having an output stage of multiple transistors, selectively connected in parallel. During operation, data regarding the size of the capacitive load is obtained and used to determine the size of the output stage. In general, as the capacitive load increases, the number of transistors connected in parallel at the output stage also increases. | 09-23-2010 |
20100244956 | Current control mechanism for low voltage applications - A current control mechanism for use in low power consumption circuits with limited headroom includes a differential transistor pair from whose collectors a current output is taken. The current output is a function of a reference voltage provided at bases of a reference transistor pair having emitters that are coupled to the bases of the differential pair. The reference voltage is controlled by a pair of control transistors that control current through a load. A pair of tracking transistors can be provided to track supply voltage. A single-ended topology can also be implemented. | 09-30-2010 |
20110018632 | POWER AMPLIFIER WITH SWITCHED OUTPUT MATCHING FOR MULTI-MODE OPERATION - Exemplary embodiments are directed to a transmitter with a power amplifier and a switched output matching circuit implementing a plurality of output paths for a plurality of operating modes is described. The power amplifier receives an input RF signal and provides an amplified RF signal. An output matching network performs impedance transformation from low impedance at the power amplifier output to higher impedance at the matching network output. The plurality of output paths are coupled to the output matching network. Each output path provides a different target output impedance for the power amplifier and routes the amplified RF signal from the power amplifier to an antenna when that output path is selected. Each output path may include a matching network coupled in series with a switch. The matching network provides the target output impedance for the power amplifier when the output path is selected. The switch couples or decouples the output path to/from the power amplifier. | 01-27-2011 |
20110187456 | Coupling Isolation Method and Operational Amplifier Using the Same - A coupling isolation method for preventing a load signal from coupling into an operational amplifier is disclosed. The coupling isolation method includes generating a system signal before the operational amplifier outputs a computation result, switching off a Miller compensation signal path of the operational amplifier at a first time point according to the system signal, and electrically connecting an output end of the operational amplifier and a load at a second time point according to the system signal to output the computation result. | 08-04-2011 |
20110187457 | Output Buffer Circuit Capable of Enhancing Stability - An output buffer circuit capable of enhancing stability includes an operational amplifier, a capacitive load and an output control unit. The operational amplifier has a positive input terminal, a negative input terminal and an output terminal, and generates an output voltage to the output terminal according to an input voltage received by the positive input terminal. The output control unit is coupled between the output terminal of the operational amplifier and the capacitive load, and is utilized for controlling electrical connection between the output terminal of the operational amplifier and the capacitive load to forma signal output path and for adjusting impedance of the signal output path when the signal output path is formed. | 08-04-2011 |
20110234316 | IMPEDANCE MATCHING CIRCUIT CAPABLE OF EFFICIENTLY ISOLATING PATHS FOR MULTI-BAND POWER AMPLIFIER - In accordance with a representative embodiment, an impedance matching circuit for use at an output stage of a power amplifier is disclosed. The impedance matching circuit comprises: an input port for receiving a frequency band signal; and a plurality of paths, each path being allocated with a principal band signal to be transmitted therethrough and including a path on-off network and a fixed-value impedance matching network. Depending on a type of the received frequency band signal, the path on-off network is configured to activate a selected one of the plurality of paths by rendering an input impedance of the selected path to have a lower absolute magnitude so that the signal is transmitted therethrough, and to deactivate the remaining paths of the plurality of paths by rendering the input impedance thereof to have a higher absolute magnitude so that the signal is not transmitted therethrough. The fixed-value impedance matching network matches a load impedance of the output port of each path to the input impedance thereof, thereby rendering the input impedance thereof to have a prescribed reference value with respect to the principal band signal when said path is activated by the path on-off network. | 09-29-2011 |
20120013401 | POWER AMPLIFIER WITH SELECTABLE LOAD IMPEDANCE AND METHOD OF AMPLIFYING A SIGNAL WITH SELECTABLE LOAD IMPEDANCE - A device includes: a power amplifier, including a supply voltage terminal, an input port and an output port, and the power amplifier being configured to receive a supply voltage at the supply voltage terminal, an input signal through the input port, to amplify the received input signal, and to output an amplified output signal through the output port; a variable impedance matching circuit having an input terminal connected to the output port of the power amplifier, and having an output terminal for being connected to a load; and a controller including a voltage measuring unit configured to measure the supply voltage, to compare the measured supply voltage with a threshold voltage, and to control the variable impedance matching circuit based on a result of the comparison so as to adjust a load impedance seen by the power amplifier at its output port. | 01-19-2012 |
20120146722 | Power Amplifier Having a Nonlinear Output Capacitance Equalization - Power amplifier (PA), regardless of the process used for the manufacturing of its devices, suffers from a nonlinear output capacitance that has significant impact on various aspects of the PA performance. This output capacitance is dependent on the large output voltage swing. Accordingly a compensation capacitance is added at the output of the PA that has a behavior that is inverse respective of the output voltage of that of the output capacitance of the PA. Connecting the compensation capacitor in parallel to the PA output capacitance, results in a total capacitance that is the sum of the output capacitance and its compensation capacitance. The total output capacitance is therefore essentially stable throughout the output voltage swing. | 06-14-2012 |
20120146723 | RADIOFREQUENCY AMPLIFIER - The invention relates to high power radiofrequency amplifiers, in particular to amplifiers having output impedance matching networks, exemplary embodiments of which include a radiofrequency amplifier having an active device mounted on a substrate within a device package, the amplifier having an output impedance matching network comprising a high pass network provided at least partly on the active device and a low pass network having a first inductive shunt connection between an output of the active device and a first output lead and a second inductive shunt connection between the output of the active device and a second output lead, wherein part of the second output lead forms an inductance contributing to the inductance of the low pass network. | 06-14-2012 |
20120280750 | CIRCUIT ARRANGEMENT FOR A REDUNDANT POWER SUPPLY FOR A POWER AMPLIFIER - The switching arrangement is used for the redundant power supply for a power amplifier, especially a high-frequency power amplifier. The power amplifier in this context provides several output-stage components and several power-supply units. The power-supply units are connected together at their load-end connections and supply the output-stage components jointly with energy. If a power-supply unit fails, at least two output-stage components are actively switched off, so that the power amplifier can continue to operate although with reduced output power. | 11-08-2012 |
20130027132 | HIGH EFFICIENCY MULTIPLE POWER MODE LINEAR RADIO FREQUENCY POWER AMPLIFIER - The embodiments disclosed in the detailed description include a power amplifier having a low power mode amplifier, a medium power mode amplifier, and a high power mode amplifier in communication with a radio frequency (RF) output load. The exemplary embodiments of the power amplifier permit a wireless device to select the most power efficient means to transmit an RF signal based upon the desired output power level. | 01-31-2013 |
20130106510 | AUDIO-OUTPUT AMPLIFIER CIRCUIT FOR AUDIO DEVICE, AUDIO DEVICE, ELECTRONIC DEVICE INCLUDING AUDIO DEVICE, AND OUTPUT CONTROL METHOD FOR AUDIO DEVICE | 05-02-2013 |
20130154735 | RF POWER AMPLIFIER AND OPERATING METHOD THEREOF - The present invention reduces the size of a power detection circuit. An RF power amplifier includes an RF amplifier circuit and a power detection circuit. The RF amplifier circuit subjects an RF input signal having a predetermined frequency band to power amplification and generates an RF amplifier output signal. The input terminal of the power detection circuit is coupled to the output of the RF amplifier circuit. The power detection circuit detects a harmonic component having a harmonic frequency that is a whole number multiple of the frequency of a fundamental wave component of the RF amplifier output signal, and generates at an output terminal a detected signal indicative of the signal level of the fundamental wave component of the RF amplifier output signal. The power detection circuit includes an input circuit, which detects the harmonic component, and an output circuit, which generates the detected signal at the output. | 06-20-2013 |
20130169359 | Power Distortion-Based Servo Control Systems For Frequency Tuning RF Power Sources - A radio frequency system includes a power amplifier that outputs a radio frequency signal to a matching network via a transmission line between the power amplifier and the matching network. A sensor monitors the radio frequency signal and generates first sensor signals based on the radio frequency signal. A distortion module determines a first distortion value according to at least one of (i) a sinusoidal function of the first sensor signals and (ii) a cross-correlation function of the first sensor signals. A first correction circuit (i) generates a first impedance tuning value based on the first distortion value and a first predetermined value, and (ii) provides feedforward control of impedance matching performed within the matching network including outputting the first impedance tuning value to one of the power amplifier and the matching network. | 07-04-2013 |
20130187712 | IMPEDANCE MATCHING CIRCUIT WITH TUNABLE NOTCH FILTERS FOR POWER AMPLIFIER - An impedance matching circuit with at least one tunable notch filter for a power amplifier is disclosed. The power amplifier amplifies an input radio frequency (RF) signal and provides an amplified RF signal. The impedance matching circuit performs output impedance matching for the power amplifier and includes at least one tunable notch filter. Each tunable notch filter has a notch that can be varied in frequency to provide better attenuation of an undesired signal. The at least one tunable notch filter attenuates at least one undesired signal in the amplified RF signal. The at least one tunable notch filter may include (i) a first tunable notch filter to attenuate a first undesired signal at a second harmonic of the amplified RF signal and/or (ii) a second tunable notch filter to attenuate a second undesired signal at a third harmonic of the amplified RF signal. | 07-25-2013 |
20130278334 | SLEW RATE AND BANDWIDTH ENHANCEMENT IN RESET - Embodiments of a capacitance sensing system including an integrating amplifier and methods for operating the same to provide a higher slew rate and bandwidth are described. In one embodiment, the integrating amplifier comprises an input stage including an inverting input coupled to an electrode of a capacitor to sense a capacitance and a non-inverting input coupled to a reference potential, and an output stage including a compensating capacitor coupled to an output. The compensating capacitor comprises two smaller capacitors coupled in parallel and a switching element configured to open when the integrating amplifier is operated in a RESET mode decoupling one of the two smaller capacitors from the output to decrease capacitance of the compensating capacitor. | 10-24-2013 |
20140103997 | POWER AMPLIFIER ASSEMBLY COMPRISING SUSPENDED STRIP LINES - It is presented a power amplifier assembly comprising; a radio frequency multi-order power amplifier comprising a circuit board; a grounding structure connected to the radio frequency multi-order power amplifier and comprising a recess; a combining network connected to a plurality of outputs of the radio frequency multi-order power amplifier. The combining network comprises: a plurality of input connection points, wherein each of the plurality of input connection points is connected to a respective output of the plurality of outputs of the radio frequency multi-order power amplifier; an output connection point; and a conductor arrangement comprising a plurality of conductive paths arranged between the plurality of input connection points and the output connection point; wherein at least one of the plurality of conductive paths is at least partly formed by a suspended conductor positioned in the recess of the grounding structure. | 04-17-2014 |
20140368268 | Load Tuning Circuit For Pulse-Width / Pulse-Position Modulation Amplifier And Related Techniques - A pulse width modulated/pulse modulated PWM/PPM power amplification circuit includes a load modulation circuit coupled between an output of the amplification circuit and a load. In one embodiment, the load modulation circuit comprises a plurality of capacitor elements switchably coupled such that in response to a control signal provided the load modulation circuit presents one of a plurality of different capacitance values at a terminal thereof. By changing capacitance values associated with the plurality of capacitor elements in accordance with the output of the amplification circuit and the load, improved (and “optimum”) power levels that exhibit a desired (and best) efficiency can be selected. Such results in an amplification circuit having an efficiency level which is relatively high compare with efficiency levels of conventional amplifier circuits over a wide dynamic range of output power. | 12-18-2014 |
330195000 | Transformer coupled | 22 |
20080218263 | Wideband differential amplifier including single-ended amplifiers coupled to a four-port transformer - A differential amplifier is formed from a first single-ended amplifier circuit, a second single-ended amplifier circuit, and a four-port transformer circuit coupled to the first and second single-ended amplifier circuits to form the differential amplifier. | 09-11-2008 |
20090174477 | MULTI-SEGMENT PRIMARY AND MULTI-TURN SECONDARY TRANSFORMER FOR POWER AMPLIFIER SYSTEMS - Embodiments of the invention may provide for power amplifier systems and methods. The systems and methods may include a power amplifier that generates a first differential output signal and a second differential output signal, a primary winding comprised of a plurality of primary segments, where a first end of each primary segment is connected to a first common input port and a second end of each primary segment is connected to a second common input port, where the first common input port is operative to receive the first differential output signal, and where the second common input port is operative to receive the second differential output signal, and a single secondary winding inductively coupled to the plurality of primary segments. | 07-09-2009 |
20100007416 | WIDEBAND DIFFERENTIAL AMPLIFIER INCLUDING SINGLE-ENDED AMPLIFIERS COUPLED TO A FOUR-PORT TRANSFORMER - A differential amplifier is formed from a first single-ended amplifier circuit, a second single-ended amplifier circuit, and a four-port transformer circuit coupled to the first and second single-ended amplifier circuits to form the differential amplifier. | 01-14-2010 |
20100052782 | TRANSFORMER AND STRUCTURE THEREOF AND POWER AMPLIFIER - A transformer and a structure thereof and a power amplifier are provided. The transformer includes a first inductor to a fourth inductor, a first capacitor, and a second capacitor. A first terminal of the first inductor receives a first signal. A first terminal of the second inductor is coupled to the first terminal of the first inductor. A first terminal of the third inductor receives a second signal, and a second terminal of the third inductor is coupled to a second terminal of the first inductor. A first terminal of the fourth inductor is coupled to the first terminal of the third inductor. The first capacitor is coupled between the first terminal of the first inductor and the first terminal of the third inductor. The second capacitor is coupled between a second terminal of the second inductor and a second terminal of the forth inductor. | 03-04-2010 |
20100259328 | AUDIO FREQUENCY AMPLIFIER - An amplifier is operable in push-pull mode, single-ended mode, or a composite mode that is an intermediate between single-ended and Push-pull modes. Moreover, at least one output device may be configured to operate using a high performance AC servo loop that functions the output device as a current source. Still further, a control input driver stage is provided that is capable of supplying sufficient AC current to overcome Miller capacitance induced roll off within the intended frequency spectrum of triode vacuum tubes. Additionally, methods are provided to substantially null or selectively introduce DC magnetic bias within the output transformer core. Still further, a solid state power supply stage provides substantial AC hum reduction during single-ended operation and simultaneously provides output voltage load regulation attributes similar to traditional vacuum tube rectifier circuits. | 10-14-2010 |
20110121898 | WIRELESS APPARATUS HAVING SHIELDING FUNCTION - There is provided a wireless apparatus having a shielding function for shielding signal interference between driving power from a power amplifier and a conductive wire of a coupler. The wireless apparatus having a shielding function, includes an amplifying unit receiving preset driving power and amplifying a radio frequency (RF) input signal according to a preset gain, an impedance matching unit including at least one coil, receiving the driving power from the amplifying unit, and matching the impedance of a path of a signal, amplified from the amplifying unit, through the coil, and a shielding unit eliminating signal interference between the coil and a transmission path of the driving power from the amplifying unit. | 05-26-2011 |
20110140781 | IMPEDANCE MATCHING CIRCUIT ELIMINATING INTERFERENCE BETWEEN SIGNAL LINES AND POWER AMPLIFIER HAVING THE SAME - Disclosed are an impedance matching circuit preventing the occurrence of inter-line interference by making currents at adjacent lines flow in the same direction, and a power amplifier having the same. The impedance matching circuit eliminating interference between signal lines includes: a first transformer including a first input line which forms a first loop by a conductor receiving a signal and a first output line which forms a second loop by a conductor outputting a signal at the inner side of the first loop of the first input line to match the impedance of a path of an input signal; and a second transformer including a second input line which forms a third loop by a conductor receiving a signal and a second output line which forms a fourth loop by a conductor outputting a signal at the inner side of the third loop of the second input line to match impedance, wherein the direction of current in the first input line of the first transformer and the direction of current in the second input line of the second transformer are the opposite so that a portion of the first input line of the first transformer and a portion of the second input line of the second transformer adjacent to the portion of the first input line of the first transformer have the same current direction. | 06-16-2011 |
20110204976 | IMPEDANCE TRANSFORMER, INTEGRATED CIRCUIT DEVICE, AMPLIFIER, AND COMMUNICATOR MODULE - An impedance transformer includes a first transmission line having a first impedance and provided over a first substrate having a first permittivity; a second transmission line and a third transmission line having an impedance lower than the first impedance and provided over a second substrate having a permittivity higher than the first permittivity, the second transmission line and the third transmission line being electrically coupled to the first transmission line; and a resistor coupled between the second transmission line and the third transmission line. | 08-25-2011 |
20110304391 | DECADE 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. | 12-15-2011 |
20120038420 | COMMUNICATIONS CIRCUIT FOR REDUCING CROSSTALK - There is provided a communications circuit for reducing crosstalk. The communications circuit for reducing crosstalk may include: a conductive power supply pattern supplying driving power applied from the outside; a first transformer implemented as an integrated passive device (IPD) type having a first input conductive line receiving a first signal of a low-frequency band received from a first power amplifier and a first output conductive line close to the first input conductive line and electromagnetically coupled with the first input conductive line, and receiving the driving power supplied from the conductive power supply pattern through a terminal formed on the first input conductive line; and a second transformer implemented as the IPD type having a second input conductive line receiving a second signal of a high-frequency band received from a second power amplifier and a second output conductive line close to the second input conductive line and electromagnetically coupled with the second input conductive line, and receiving the driving power supplied from the conductive power supply pattern through a terminal formed on the second input conductive line, and the conductive power supply pattern may include an inductor component. Therefore, crosstalk between the low-frequency band and the high-frequency band can be reduced. | 02-16-2012 |
20120242406 | SIGNAL TRANSFORMING CIRCUIT - A signal transforming circuit includes: a first substantially 8-shaped geometry primary winding arranged to couple a first input signal; and a substantially 8-shaped geometry secondary winding having a first port and a second port, the substantially 8-shaped geometry secondary winding disposed adjacent to the first substantially 8-shaped geometry primary winding to magnetically couple to the first substantially 8-shaped geometry primary winding for generating an output signal at the first port and the second port. | 09-27-2012 |
330196000 | With additional impedance connected to "P" or "S" circuit | 6 |
20100026389 | DUAL MODE POWER AMPLIFIER OUTPUT NETWORK - A dual mode power amplifier output network is provided that includes a load switch and an auto transformer having a primary winding and a secondary winding. The load switch is connected to the secondary winding of the auto transformer. | 02-04-2010 |
20110221528 | BALUN FUNCTION WITH REFERENCE ENHANCEMENT IN SINGLE-ENDED PORT - Systems and methods are provided for a transformer or balun function with reference enhancement. The systems and methods may include a transformer having at least a primary winding and a secondary winding for reference enhancement, where the primary winding includes a center tap, where the secondary winding includes a first port and a second port, and an electrical connection that electrically connects the second port and the center tap of the primary winding to provide a common reference for the primary winding and the secondary winding. The primary winding of the transformer may be configured to receive differential outputs of a power amplifier, and the transformer may be configured to convert the differential outputs from a balanced signal to an unbalanced signal available at the first port of the secondary winding. | 09-15-2011 |
20120075019 | PA LOAD-LINE TUNING WITH CAPACITORS AROUND A BALUN - An on-chip power amplifier includes first and second variable capacitors connected in parallel with first and second windings, respectively, of an on-chip balun. The first balun winding connects between the differential outputs of an on-chip differential amplifier. Varying the first variable capacitor changes the imaginary part of the load impedance of the differential amplifier, while varying the second variable capacitor changes the real part of the load impedance of the differential amplifier. In one embodiment, the first and second variable capacitors are generally orthogonal, such that the first and second variable capacitors are less than 25% correlated. As a result, varying the first variable capacitor has little impact on the real part of the load impedance, and varying the second variable capacitor has little impact on the imaginary part of the load impedance. In this way the load impedance can be tuned to the optimum performance. | 03-29-2012 |
20140062591 | POWER AMPLIFIER WITH VARIABLE OUTPUT IMPEDANCE - A power amplifier circuit, comprising: an amplifier for receiving an input signal to be amplified; a power input for coupling the amplifier to a power supply; and a transformer for providing the amplified signal from the amplifier to a load, comprising a primary inductor and a secondary inductor. The power amplifier circuit is characterized by: a first capacitor coupled in parallel with the primary inductor; and a second capacitor coupled in parallel with the secondary inductor; wherein at least one of the first and second capacitors has a variable capacitance. | 03-06-2014 |
20140292407 | Transformer Structures For A Power Amplifier (PA) - In one embodiment, the present invention includes a transformer formed on a semiconductor die. Such transformer may have multiple coils, including first and second coils. Each coil may have segments that in turn are formed on a corresponding metal layer of the semiconductor die. The segments of a given coil are coupled to each other, and the first and second coils can be interdigitated with each other. | 10-02-2014 |
20150116033 | Impedance matching system that has a transformer and method for tuning a system using a transformer - A system that includes an amplification circuit; a resonant circuit that is arranged to receive the amplified signal and to output an resonant circuit output signal; wherein the resonant circuit comprises a continually tuned variable capacitor; a transformer that is arranged to receive the resonant circuit output signal and to output a transformer output signal; a coupler that is arranged to sample the transformer output signal and a reflected signal and to output a first signal that represents the transformer output signal and a second signal that represents a reflected signal; a detector that is arranged to receive the first and second signals and to output an impedance indicative signal a control circuit that is arranged to generate the resonant circuit tuning signal in response to the impedance indicative signal and for compensating for the impedance mismatch. | 04-30-2015 |
330197000 | With transformer structure | 5 |
20100148866 | Systems and Methods for Power Amplifiers with Voltage Boosting Multi-Primary Transformers - Systems and methods may be provided for a power amplifier system. The systems and methods may include a plurality of power amplifiers, where each power amplifier includes at least one output port. The systems and methods may also include a plurality of primary windings each having a first number of turns, where each primary winding is connected to at least one output port of the plurality of power amplifiers, and a single secondary winding inductively coupled to the plurality of primary windings, where the secondary winding includes a second number of turns greater than the first number of turns. | 06-17-2010 |
20100277237 | SWITCHABLE POWER COMBINER - A switchable power combiner is disclosed. The switchable power combiner has an output section that is a signal source connected to a transformer section. The transformer section has one or more primaries and a common secondary. The transformer primaries and secondary are acoustically coupled. The primaries or/and the secondary are made of switchable piezoelectric material, such that the acoustic coupling between any primary and the secondary can be switched on or off by electrical control, thereby implementing a switchable power combiner. The transformer secondary is connected to an antenna port. The power amplifier output section is segmented and connected to the transformer primaries. The power amplifier output section has a plurality of power amplifiers and a plurality of reactance elements, either fixed or variable. The switchable power combiner generates different linear load lines by switching on and off the coupling between any primary and the secondary. | 11-04-2010 |
20110133835 | DOUBLE TRANSFORMER BALUN FOR MAXIMUM POWER AMPLIFIER POWER - Double transformer balun for maximum PA (Power Amplifier) power. A novel approach is presented herein by which conversion from a differential signal to single-ended signal may be achieved using a double transformer balun design. The secondary coils of the double transformer balun also operate as a choke for the PA supply voltage. The secondary coils can operate as an RF (Radio Frequency) trap or choke to keep any AC (Alternating Current) signal components and to pass any DC (Direct Current) components. By using a double transformer balun design, relatively thinner tracks may be employed thereby ensuring a high degree of electromagnetic coupling efficiency and high performance. Also, these relatively thinner tracks consume a relatively small amount of space on the die. The double transformer balun design also includes a matching Z (impedance) block that is operable to match the Z of an antenna or line that the PA is driving. | 06-09-2011 |
20140085001 | LINEAR ROW ARRAY INTEGRATED POWER COMBINER FOR RF POWER AMPLIFIERS - A novel and useful radio frequency (RF) front end module (FEM) circuit that provides high linearity and power efficiency and meets the requirements of modern wireless communication standards such as 802.11 WLAN, 3G and 4G cellular standards, Bluetooth, ZigBee, etc. The configuration of the FEM circuit permits the use of common, relatively low cost semiconductor fabrication techniques such as standard CMOS processes. The FEM circuit includes a power amplifier made up of one or more sub-amplifiers having high and low power circuits and whose outputs are combined to yield the total desired power gain. An integrated multi-tap transformer having primary and secondary windings arranged in a novel configuration provide efficient power combining and transfer to the antenna of the power generated by the individual sub-amplifiers. | 03-27-2014 |
20140085002 | Two Dimensional Quad Integrated Power Combiner for RF Power Amplifiers - A novel and useful radio frequency (RF) front end module (FEM) circuit that provides high linearity and power efficiency and meets the requirements of modern wireless communication standards such as 802.11 WLAN, 3G and 4G cellular standards, Bluetooth, ZigBee, etc. The configuration of the FEM circuit permits the use of common, relatively low cost semiconductor fabrication techniques such as standard CMOS processes. The FEM circuit includes a power amplifier made up of one or more sub-amplifiers having high and low power circuits and whose outputs are combined to yield the total desired power gain. An integrated multi-tap transformer having primary and secondary windings arranged in a novel configuration provide efficient power combining and transfer to the antenna of the power generated by the individual sub-amplifiers. | 03-27-2014 |