| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 330129000 | With control of input electrode or gain control electrode bias | 80 |
| 20080211575 | Loop Gain Equalizer For Rf Power Amplifier - The output power of an RF power amplifier is controlled using a feedback loop including a differential integrator for controlling the amplifier's bias voltage. The gain of integration in the differential integrator is varied so as to compensate for variations in the derivative of the power amplifier output power versus the bias voltage. | 09-04-2008 |
| 20090167435 | POWER CONTROL CIRCUIT AND POWER CONTROL METHOD - A power control circuit includes: a fine adjustment variable amplifying unit configured to amplify the input signal in accordance with a first gain set value; a coarse adjustment variable amplifying unit configured to amplify the input signal in accordance with a second gain set value; a branching unit configured to branch an output signal into a feedback signal; a comparing unit configured to compare a gain value between the input signal and the output signal with the required gain set value; a control unit configured to determine the first gain set value and the second gain set value based on the required gain set value; and an adjusting unit configured to adjust the first gain set value and the second gain set value so that the power value of the feedback signal becomes a power value corresponding to the required gain set value. | 07-02-2009 |
| 20100045374 | GAIN ADJUSTMENT DEVICE AND METHOD THEREOF - A gain adjustment device and a method thereof are provided. The device includes a first processing module, a gain adjustment circuit, a second processing module, and a gain control module. The first processing module receives an input signal and generates a first signal. An operating voltage of the first processing module is a first voltage. The gain adjustment circuit receives the first signal and adjusts a gain of the first signal according to a gain control signal to output a third signal. The second processing module receives the third signal and generates a second signal. An operating voltage of the second processing module is a second voltage. The gain control module generates the gain control signal according to the first voltage and the second voltage. | 02-25-2010 |
| 20130049860 | BICYCLE-USE MEASURING APPARATUS AND CONTROL METHOD - A bicycle-use measuring apparatus includes a sensor, a signal amplifying section and a gain control section. The sensor is configured to be installed on a bicycle having a rotating part. The signal amplifying section amplifies an output of the sensor. The gain control section adjusts a gain of the signal amplifying section in accordance with changes in a rotational state of the rotating part. | 02-28-2013 |
| 20120218039 | SYSTEMS AND METHODS FOR SATURATION CORRECTION IN A POWER CONTROL LOOP - A power amplification circuit includes a power amplifier, an RF detector, an error amplifier, a saturation detector, and an offset circuit. The power amplifier provides an amplified signal based on an input signal and a gain control signal. The RF detector provides a detection signal indicative of a logarithm of the power of the amplified signal. The error amplifier provides the gain control signal based on an amplification control signal and the detection signal. The saturation detector provides a saturation signal in response to the gain control signal differing from a reference signal by less than a first predetermined voltage. The offset circuit decreases a voltage level of the amplification control signal by up to a second predetermined voltage in response to the saturation signal and the amplification control signal differing from the detection signal by less than the second predetermined voltage. | 08-30-2012 |
| 20130093514 | POWER CONVERTER SYSTEM FOR MOBILE DEVICES - A power converter system for managing power between a power supply and a load, the system including: a first buck-boost circuit connected to the power supply; and a capacitor provided between the buck-boost circuit and the load to buffer power supply for the load. The system may include a second buck-boost circuit between the capacitor and the load. In another embodiment, a power converter system includes: a boost circuit connected to the power supply; a buck circuit connected to the load; and a capacitor provided between the boost circuit and the buck circuit to manage the supply of power to the load. | 04-18-2013 |
| 20090102555 | Automatic gain Control (AGC) with lock detection - A method, algorithm, circuits, and/or systems for automatic gain control (AGC) are disclosed. In one embodiment, an AGC circuit can include a comparator configured to compare an output of an amplifier against a reference voltage, gain logic configured to decrease a gain of the amplifier when an output of the comparator has a first state, and to periodically increase the gain of the amplifier, a digital-to-analog converter (DAC) configured to receive an output from the gain logic and control the gain of the amplifier, and lock detection logic configured to determine from the output of the gain logic when the gain of the amplifier is in a predetermined range. | 04-23-2009 |
| 20110298539 | RF POWER AMPLIFIER CIRCUIT WITH MISMATCH TOLERANCE - A radio frequency (RF) power amplifier system adjusts the supply voltage provided to a power amplifier (PA) adaptively, responsive to the measured or estimated power of the RF output signal of the PA. The RF PA system includes a power amplifier (PA) which receives and amplifies an RF input signal to generate an RF output signal at a level suitable for transmission to an antenna. A PA supply voltage controller generates a supply voltage control signal, which is used to control the supply voltage to the final stage of the PA. The supply voltage control signal is generated responsive to the measured or estimated power of the PA RF output signal, and also may be responsive to a parameter indicative of impedance mismatch experienced at the PA output. By controlling this supply voltage to the RF PA, the efficiency of the PA is improved. | 12-08-2011 |
| 20110291757 | DISTRIBUTED THRESHOLD ADJUSTMENT FOR HIGH SPEED RECEIVERS - According to one general aspect, a distributed threshold adjuster (DTA) may be interspersed between stages of a multistage amplifier to adjust the DC voltage of an input signal. The DTA may include an input signal terminal configured to receive the input signal. The DTA may also include a plurality of current sources configured to produce an adjustment current signal whose amperage is configured to be increased or decreased by fixed steps in order to adjust the DC voltage of the input signal. The DTA may include a control unit configured to selectively turn on or off the individual current sources of the plurality of current sources to select the amperage of the adjustment current signal. The DTA may further include an output terminal configured to produce an output signal, comprising a combination of the input signal and the adjustment current signal, to a stage of a multistage amplifier. | 12-01-2011 |
| 20110068866 | Amplifying device - An amplifying device includes a selecting section that selects one of a first power source potential and a second power source potential which are different from each other, a potential generating circuit that generates a third power source potential from the power source potential selected by the selecting section, an amplifier that operates with supply of the first power source potential and the third power source potential, and a controlling circuit that variably controls a target to be selected by the selecting section in accordance with at least one of an amplitude of a signal on an input side of the amplifier, an amplitude of a signal on an output side of the amplifier, and the third power source potential. | 03-24-2011 |
| 20100033245 | Controlling the performance of a thermionic tube - Controlling the performance of the thermionic tube ( | 02-11-2010 |
| 20110267142 | MULTI-STATE DC-DC CONVERTER - DC-DC converters adapted to provide two or more DC output voltages. More particularly, a multi-state or mode DC-DC converter circuit comprising first and second controllable switches configured for unidirectional conduction of charging current. | 11-03-2011 |
| 20110140778 | AUTOMATIC GAIN CONTROL METHOD AND APPARATUS - An automatic gain control method of a receiving apparatus is provided. The automatic gain control method includes low-noise amplifying a signal using a first gain value, amplifying the low-noise amplified signal to a second gain value, determining the first gain value using a strength of the low-noise amplified signal, and determining the second gain value using the signal amplified to the second gain value. Accordingly, the reliability of the automatic gain control may be guaranteed. | 06-16-2011 |
| 20110221523 | OPERATING PARAMETER CONTROL FOR A POWER AMPLIFIER - A method of controlling operating parameters of a radio frequency power amplifier amplifying an input signal applied in bursts with controlled input power to an input of the power amplifier, comprising responding to gain variation parameters relating to variations in the scalar gain of said amplifier starting during an initial ramp-up period of a first burst to control supply voltage and quiescent current parameters for said amplifier during a subsequent burst. | 09-15-2011 |
| 20090079498 | OFFSET CANCELLATION IN A CAPACITIVELY COUPLED AMPLIFIER - A method for calibrating an offset voltage of an amplifier used to amplify capacitively coupled communication signals is described. During this process, a common voltage is applied to one or more inputs to the amplifier. Next, an output of the amplifier is iteratively, measured, and charge is applied to the one or more inputs until the offset voltage is less than a pre-determined value. Note that applying the charge may involve applying a sequence of one or more charge pulses. | 03-26-2009 |
| 20100259327 | Automatic Gain Control Method and Apparatus - Automatic gain control method and apparatus control a gain of a received signal. While the gain is adjusted and thus converges, a finding mode is entered to additionally change the gain at least once according to at least one characteristic value obtained from a relationship between the gain and time, such that the gain approaches a target level. In other embodiments, a tracking mode is further entered to periodically adjust the gain at a period greater than that before when signal strength is being tracked to reduce noise energy introduced. Hence, the embodiments can improve a gain converging speed and reduce the influence of the noise on the communication system in a dynamic receiving environment, and thus enhance the signal receiving performance. | 10-14-2010 |
| 20100277235 | Gain Control Methods and Systems in an Amplifier Assembly - A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low threshold and a target threshold intermediate the high and low thresholds. A controller module changes the gain of the VGA so as to drive the detected power in a direction toward the middle threshold when the comparator module indicates the detected power is not between the high and low thresholds. | 11-04-2010 |
| 20090066414 | Gain control methods and systems in an amplifier assembly - A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low threshold and a target threshold intermediate the high and low thresholds. A controller module changes the gain of the VGA so as to drive the detected power in a direction toward the middle threshold when the comparator module indicates the detected power is not between the high and low thresholds. | 03-12-2009 |
| 20090108931 | PROGRAMMABLE GAIN CIRCUIT - A programmable gain circuit suitable for a programmable gain amplifier is described. In one design, the programmable gain circuit includes multiple attenuation circuits coupled in series. Each attenuation circuit operates in a first mode or a second mode, attenuates an input signal in the first mode, and passes the input signal in the second mode. The multiple attenuation circuits may provide the same or different amounts of attenuation. The multiple attenuation circuits may include binary decoded attenuation circuits and/or thermometer decoded attenuation circuits. In one design, each attenuation circuit includes a divider circuit and at least one switch. The switch(es) select the first mode or the second mode. The divider circuit attenuates an input signal in the first mode and passes the input signal in the second mode. The programmable gain circuit may have a predetermined input impedance and a predetermined output impedance for all gain settings. | 04-30-2009 |
| 20100134184 | HYBRID POWER CONTROL FOR A POWER AMPLIFIER - A hybrid power control system ( | 06-03-2010 |
| 20110148519 | POWER AMPLIFIER POWER CONTROLLER - A power amplifier power controller in the power amplifier system monitors various operating conditions of the power amplifier, and controls the output transmit power of the power amplifier by coordinated control of both the input drive level to the power amplifier and the gain of the power amplifier. The power amplifier power controller controls the input drive level to the power amplifier so that the input drive level does not change substantially while adjusting the gain of the power amplifier to maximize the transmit power. The power amplifier power controller may also adjust the input drive level by some portion of the overall change required to the power of the power amplifier, while adjusting the gain of the power amplifier by the remaining portion of such overall change. | 06-23-2011 |
| 20120154037 | AMPLIFIER CURRENT CONSUMPTION CONTROL - The audio amplifier includes a variable gain amplifier receiving the input audio signal and providing the output signal, whereby the output signal corresponds to the input signal amplified by a limiter gain. The audio amplifier further includes a limiter gain calculation unit, thus the input signal is amplified by the limiter gain. A control unit receives a signal representative of the input signal and is configured to estimate, based on a mathematical model, the input current or the total output current of the audio amplifier thus providing an estimated current signal corresponding to (and resulting from) the output signal, whereby the limiter gain calculation unit is configured to calculate, dependent on the estimation, the limiter gain such that the actual input current or the total output current of the audio amplifier does not exceed a threshold current value. | 06-21-2012 |
| 20110181354 | RECEPTION DEVICE AND ELECTRONIC DEVICE USING THE SAME - A reception device according to the present invention includes: a step-variable gain amplifier; and a controller operable to control the gain of the step-variable gain amplifier based on the signal quality value of a demodulator. The gain of the step-variable gain amplifier varies within N gains from a first gain to an N-th gain, and the controller changes a number of the gain one by one when changing the gain of the step-variable gain amplifier. Thus, it is possible to realize a reception device using the step-variable gain amplifier requiring a low control voltage as compared to a continuously-variable gain amplifier. | 07-28-2011 |
| 20120212295 | Power Amplifier Apparatus, and Receiving Apparatus of a User Equipment - A Power Amplifier (PA) apparatus includes a first stage PA tube, configured to amplify gain of input signals. A first stage bias circuit is connected to the first stage PA tube and is configured to provide bias voltage for the first stage PA tube. A second stage PA tube is configured to amplify gain of output signals of the first stage PA tube. A second stage bias circuit is configured to provide bias voltage for the second stage PA tube. A reference voltage unit is connected to the first stage bias circuit and the second stage bias circuit. A voltage control unit is connected to the first stage bias circuit and the second stage bias circuit and is configured to connect and disconnect the first stage PA tube through the first stage bias circuit, and connect and disconnect the second stage PA tube through the second stage bias circuit. | 08-23-2012 |
| 20120249239 | CORRELATED-DOUBLE-SAMPLING SWITCHED-CAPACITOR GAIN STAGES, SYSTEMS IMPLEMENTING THE GAIN STAGES, AND METHODS OF THEIR OPERATION - Embodiments of switched-capacitor gain stage circuits and methods of their operation are provided. The circuit includes an operational amplifier, parallel sampling capacitors, an offset storage capacitor coupled to an amplifier input, and multiple switches that are configurable to place the gain stage circuit in a sampling state, a gain state, and an output state. In the sampling state, the switches are configured so that a first charge component representing an input signal is stored on the sampling capacitors, and a second charge component representing an amplifier offset voltage is stored on the offset storage capacitor. In the gain state, the switches are configured so that a third charge component representing a finite gain of the amplifier is stored on the offset storage capacitor. In the output state, the switches are configured so that the first, second, and third charge components contribute to an output signal produced at the output node. | 10-04-2012 |
| 20120262233 | MIXED SIGNAL DYNAMIC RANGE COMPRESSION - This document discusses, among other things, apparatus and methods for providing dynamic range compression. In an example, an amplifier can an first amplifier configured to receive a representation of an input signal and provide an amplified representation of the input signal to an output stage, an automatic gain control comparator configured to provide automatic gain control information to the first amplifier, a plurality of dynamic range compression comparators configured to provide a plurality of signals indicative of an amplitude of an output signal of the output stage, a first voltage divider configured to provide an automatic gain control threshold to the automatic gain control comparator, and a second voltage divider configured to receive the automatic gain control threshold and to provide a plurality of range compression thresholds to the plurality of dynamic range compression comparators. | 10-18-2012 |
| 20120299650 | Self-Calibrating Gain Control System - A circuit for self-calibrating a gain control system samples the output of a digital amplifier coupled in series with one or more analog amplifiers to correct errors in a discrete stepped gain control. A digital gain control circuit controls both the digital amplifier and at least one analog amplifier to produce a smooth linear and continuous gain, wherein perturbations in the digital control of gain are smoothed by a signal applied to gain control circuit by a gain step correction circuit. | 11-29-2012 |
| 20120235739 | PROGRAMMABLE GAIN AMPLIFIER WITH MULTI-RANGE OPERATION FOR USE IN BODY SENSOR INTERFACE APPLICATIONS - A system for analyte measurement includes a programmable gain amplifier including a first input terminal operatively coupling to the output of a sensor for sensing an analyte, a second input terminal operatively coupling to a voltage source, and an output terminal for providing an output based on a difference between inputs on the first input terminal and the second input terminal A controller is operatively coupled to the programmable gain amplifier for configuring the operation range of the programmable gain amplifier and/or selecting the output of the programmable gain amplifier for analyte measurement. The method includes monitoring an output from a programmable gain amplifier operatively coupling to a sensor for sensing an analyte, and controlling the operation range of the programmable gain amplifier, and/or selecting the output of the programmable gain amplifier for analyte measurement. | 09-20-2012 |
| 20120235740 | Low-Cost Magnetic Stripe Reader Using Independent Switching Thresholds - A F/2F waveform generator has a comparator and an analog multiplexer. In a low-cost magnetic card reader application, a magnetic track signal is amplified, filtered, and compared with a threshold signal to create a digital signal output. The analog multiplexer detects changes in state of the digital signal. When a change of state is detected, the analog multiplexer switches among dynamically tunable threshold signals. The selected threshold signal is used for comparison with the magnetic track signal. Switching level detection enables accurate F/2F waveform generation from relatively noisy magnetic track signals, thus improving the robustness of magnetic card readers. The analog implementation eliminates the need for expensive A/D conversion and processing and the design can be readily implemented in a very compact and low-cost package. | 09-20-2012 |
| 20120319775 | AUTOMATIC GAIN CONTROL APPARATUS AND METHOD - An automatic gain control apparatus for a wireless receiver, including multiple variable gain amplifiers, one variable gain amplifier provided for each one of multiple receive chains and a gain controller to control a gain of the variable gain amplifiers provided for the plurality of receive chains. The gain controller includes multiple output level measurement units to measure an output level of a corresponding receive chain; a common gain determination unit to determine a common gain for each of the variable gain amplifiers based on a statistical value obtained from the output levels; multiple adjusted gain determination units, each adjusted gain determination unit determining an adjusted gain independently for each variable gain amplifier within a range narrower than the range of the common; and a gain setting unit to set a gain to each of the variable gain amplifiers based on the common gain and the adjusted gain. | 12-20-2012 |
| 20120319774 | MULTI-STAGE GAIN CONTROL IN RECEIVERS AND OTHER CIRCUITS - Techniques and devices are disclosed to provide multi-stage gain control in circuits or devices having two or more stages of signal amplification. A circuit with multi-stage gain control can include amplification stages coupled to receive an input signal and to produce an amplified output signal. Each amplification stage includes an amplifier that is adjustable in gain and a signal detector that is coupled to measure an output signal of the amplifier and to produce a detector signal indicative of a signal strength of the output signal of the amplifier. A gain control circuit is coupled to receive detector signals from the signal detectors in the amplification stages, respectively, and to control gains of the amplifiers of the amplification stages based on respective received detector signals, respectively. | 12-20-2012 |
| 20110291756 | METHOD AND SYSTEM FOR POLAR MODULATION WITH DISCONTINUOUS PHASE FOR RF TRANSMITTERS WITH INTEGRATED AMPLITUDE SHAPING - Aspects of a method and system for polar modulation with discontinuous phase for RF transmitters with integrated amplitude shaping may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain, an amplitude offset gain and a pulse-shaping gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the coarse amplitude gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the amplitude offset gain and the pulse-shaping gain, wherein the one or more of the plurality of amplifiers used to set said amplitude offset gain and said pulse-shaping gain are distinct from the one or more of said plurality of amplifiers used to set the coarse amplitude gain. | 12-01-2011 |
| 330130000 | Bias controlled by separate external control source | 2 |
| 20130088293 | METHOD AND APPARATUS FOR PROGRAMMABLE GAIN CONTROL USEFUL WITH DIGITAL TO ANALOG CONVERTER - A programmable gain controller (PGC) useful with a digital to analog converter is coupled to an input node providing a current source that is variable with a level of an input signal such as time sampled audio data, and multiple switches controlled to function as a digital gain control. Each switch is configured to selectively steer a variable fraction of the current provided by a current source to either a current sink node or to an output node of the PGC to provide at least one scaled current. An amplifier is coupled to an output of the PGC. The amplifier is configured to convert scaled current(s) to at least one output signal having an amplitude that is a function of both the input signal level and the digital gain input signal. Controlling the gain by steering current at the analog portion of the apparatus conserves circuit space and reduces noise. | 04-11-2013 |
| 20110298540 | SYSTEM AND METHOD FOR CONTROLLING A POWER AMPLIFIER USING A PROGRAMMABLE RAMP CIRCUIT - A system and method for controlling a power amplifier using a programmable ramp circuit involves receiving an input bias current at a programmable ramp circuit, generating an output bias current based on the input bias current using the programmable ramp circuit, and transmitting the output bias current from the programmable ramp circuit to a power amplifier for amplifying a radio frequency signal. | 12-08-2011 |
| 330131000 | Control of bias on separate gain control electrode | 15 |
| 20100109770 | RECONFIGURABLE POWER AMPLIFIER AND USE OF SUCH AMPLIFIER FOR MAKING A MULTI-STANDARD AMPLIFICATION STAGE FOR MOBILE PHONE COMMUNICATIONS - A reconfigurable power amplifier includes at least one amplification circuit (E | 05-06-2010 |
| 20130099861 | METHOD AND APPARATUS FOR CONTROLLING TRANSMIT SIGNAL OF RADIO FREQUENCY POWER AMPLIFIER - A method and an apparatus for controlling a transmit signal of a radio frequency power amplifier are provided. The method includes: adjusting a power supply voltage of the power amplifier to an efficiency point power supply voltage under designated transmit power; querying correspondence between an input voltage and transmit power at each power level under the efficiency point power supply voltage; and adjusting, according to the correspondence, an input voltage to an input voltage corresponding to the designated transmit power. The embodiments of the present invention, the power amplifier is enabled to work at an optimum efficiency point while the transmit power of the power amplifier is under control, which improves efficiency of the power amplifier. | 04-25-2013 |
| 20120293255 | AMPLIFIER, TRANSMISSION DEVICE, AND AMPLIFIER CONTROL METHOD - An amplifier includes an envelope detection unit that detects an envelope of a transmission signal; a comparing unit that compares a voltage of the envelope with a reference voltage; a selecting unit that selects, in accordance with a comparison result obtained by the comparing unit, an amplifying element that amplifies the transmission signal from among a plurality of amplifying elements each having different operating power; a voltage control unit that controls, in accordance with the envelope, a voltage that is used to amplify the transmission signal in the amplifying element that is selected by the selecting unit; a current measuring unit that measures a current of a power supply that supplies the voltage that is controlled by the voltage control unit; and a reference voltage control unit that controls the reference voltage such that the current measured by the current measuring unit decreases. | 11-22-2012 |
| 20120105151 | TRANSMISSION CIRCUIT AND TRANSMISSION METHOD - Provided is a transmission circuit capable of compensating a variation in output power caused due to a temperature change or an individual variability when the operation mode is switched without an increase in the size of the transmission circuit which switches the operation mode between a linear operation mode and a nonlinear operation mode, and capable of suppressing the deterioration of the quality of a transmission signal. In the transmission circuit, a gain setting section ( | 05-03-2012 |
| 20100308909 | PA GAIN STATE SWITCHING BASED ON WAVEFORM LINEARITY - Techniques for optimizing the power consumption of existing low cost multi-gain state power amplifiers (PA) to increase the talk time of wireless communication devices are described. In an exemplary embodiment a device, such as a baseband processor, operates to set a multistage PA having at least two gain states for amplifying a transmit signal to a lowest power consuming gain state. The device calculates a transition power level as a function of an identified maximum power reduction (MPR) value and switches the PA to a higher gain state from a lower gain state when a transmission power level is higher than the calculated transition power level. | 12-09-2010 |
| 20110043282 | 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. | 02-24-2011 |
| 20110068867 | SYSTEM AND METHOD FOR INTERPOLATING DIGITALLY-CONTROLLED AMPLIFIER GAIN - A digitally-controlled analog gain circuit supports a plurality of gain settings in which gain changes are made from a first setting to a new setting in response to a clocking signal. Large changes in gain are interpolated in small gain steps or increments. The clocking signal can be generated by an oscillator, or as a sequence of pulses output by a zero crossing detector. The gain circuit can apply positive gain to the signal. Alternatively, the gain circuit can apply a negative gain (attenuation) to the signal. The clocking signal can be provided in a pseudo-randomized manner to minimize unwanted signal effects such as discernable sound transients. | 03-24-2011 |
| 20120200354 | APPARATUS AND METHODS FOR ENVELOPE TRACKING CALIBRATION - Apparatus and methods for envelope tracking calibration are provided. In one embodiment, a method of calibrating an envelope tracker having an envelope shaping table generated at a desired gain compression of a power amplifier is provided. The method includes generating a supply voltage for the power amplifier using the envelope tracker, operating the supply voltage of the power amplifier at a first voltage level associated with substantially no gain compression of the power amplifier, and measuring an output power of the power amplifier at the first voltage level. The method further includes decreasing a voltage level of the supply voltage one or more times and measuring the output power at each voltage level, determining a second voltage level of the power amplifier associated with a gain compression equal to about that of the desired gain compression, and calibrating the envelope tracker based on the determination. | 08-09-2012 |
| 20100321108 | METHOD AND APPARATUS FOR CONTROLLING HIGH POWER AMPLIFIER IN COMMUNICATION SYSTEM - An apparatus and method for controlling a high power amplifier in a communication system are provided. The apparatus includes a Radio Frequency (RF) power detection unit for detecting an intensity of an RF input signal, a high power amplifier controller for determining a control signal, which indicates a voltage value of a drain bias to be provided to at least one drain node from among drain nodes of a drive amplifier and a main amplifier included in the high power amplifier, according to the detected intensity, a Direct Current (DC) voltage supplying unit for generating a DC voltage corresponding to the determined control signal, a drain bias connection unit for providing the generated DC voltage to said at least one drain node from among the drain nodes of the drive amplifier and the main amplifier, and the drive amplifier and the main amplifier for amplifying the RF input signal according to the provided DC voltage. | 12-23-2010 |
| 20120306572 | METHOD OF POWER AMPLIFIER CALIBRATION FOR AN ENVELOPE TRACKING SYSTEM - A method for power amplifier (PA) calibration for an envelope tracking system of a wireless device is disclosed. The method involves measuring an output power of a PA that is a part under test (PUT) at a predetermined input power. Another step includes calculating a gain equal to the output power of the PA divided by the predetermined input power. A next step involves calculating a gain correction by subtracting the calculated gain from a desired gain. Other steps include determining an expected supply voltage for the PA at the desired gain using the gain correction applied to a nominal curve of gain versus PA supply voltage, and then storing the expected supply voltage for the PA versus input power in memory. | 12-06-2012 |
| 20110090008 | POWER AMPLIFICATION APPARATUS AND POWER AMPLIFICATION METHOD - Disclosed is a power amplifier apparatus including: an amplifier amplifying an input modulated signal; a control signal generator receiving an amplitude component of the input modulated signal and generating a control signal; and a power combiner performing ON/OFF control of a switching element based on the control signal to control conduction and non-conduction of a current supplied from a second power supply. In the power combiner, a power of a pulsed form when the current from the second power supply is conductive is transferred in a direction of a first power supply, using a transformer. A difference power obtained by subtracting a constant value from a first power supply voltage when the amplitude of the input modulated signal is smaller than that of a reference signal is supplied from the power combiner to the amplifier, as a power supply thereof (FIG. | 04-21-2011 |
| 20120249240 | System and method for effectively implementing a front end for a transimpedance amplifier - An apparatus for implementing a front end circuit for a transimpedance amplifier includes a front end core that receives an input signal from a photo diode. The front end core responsively generates a balanced output signal to downstream devices. A power supply provides a supply voltage to the front end circuit. In accordance with the present invention, a current source is located between the supply voltage the front end core to thereby isolate the front end core from disturbances on the power supply. This biasing arrangement advantageously provides an improved power supply rejection ratio for the front end circuit. | 10-04-2012 |
| 20120133432 | HIGH EFFICIENCY AUDIO AMPLIFIER - An audio amplifier circuit is described which comprises an operational amplifier. The operational amplifier receives an audio input signal and provides an output suitable for connecting a headphone, or a loudspeaker. A step-up converter is provided which supplies the operational amplifier. The audio amplifier is configured to operate in one of multiple operating modes, each of which uses a distinct supply voltage Vcc of the operational amplifier in the audio amplifier. Comparators are used to compare the output voltage of the operational amplifier with a first reference voltage to raise the supply voltage of the operational amplifier, if clipping is imminent. A second comparator is used to compare the output voltage of the operational amplifier with a second reference voltage, indicating that the supply voltage of the operational amplifier can be lowered without the risk of clipping. | 05-31-2012 |
| 20120313702 | Dual Rail Out-Phased Envelope Tracking Modulator - A drain modulator circuit for operation with a radio frequency (RF) amplifier, includes a pair of AC signal sources each of the AC signal sources having an output at which an AC signal is provided. The drain modulator circuit further includes a pair of tapped delay elements, each of which is configured to receive an AC signal from a respective one of the AC signal sources and a control element coupled to provide one or more control signals to the pair of tapped delay elements such that the tapped delay elements provide a selected instantaneous differential voltage to the RF amplifier. | 12-13-2012 |
| 20120326782 | AUTOMATIC GAIN CONTROL CIRCUIT - In an automatic gain control circuit, a peak detection circuit detects and outputs the peak voltage of an output signal from a variable gain circuit. An average value detection/output amplitude setting circuit detects the average value voltage of an output signal from the variable gain circuit, and outputs a calculated voltage. An amplification circuit controls the gain of the variable gain circuit by amplifying the difference between the output voltages of the peak detection circuit and average value detection/output amplitude setting circuit. The number of base-emitter junctions of transistors on a path in the peak detection circuit from input ports which receive output signals from the variable gain circuit to an output port which outputs a voltage to the amplification circuit is equal to the number of base-emitter junctions of transistors on a path in the average value detection/output amplitude setting circuit. | 12-27-2012 |
| 330132000 | Frequency selective means to select control signal from amplifier channel | 1 |
| 20080204135 | METHOD AND SYSTEM FOR LOW NOISE AMPLIFIER (LNA) GAIN ADJUSTMENT THROUGH NARROWBAND RECEIVED SIGNAL STRENGTH INDICATOR (NRSSI) - A method for processing a plurality of signals may include amplifying an input signal and generating a wideband signal from the amplified input signal. The method may further include bandpass filtering the generated wideband signal to generate a narrowband signal, and adjusting amplification of the input signal based on a narrowband received signal strength indication of the generated narrowband signal, and/or a wideband received signal strength indication of the generated wideband signal. The amplified input signal may be downconverted to generate the wideband signal. The amplified input signal may be downconverted to an intermediate frequency (IF) and/or to a baseband signal to generate the wideband signal. At least one blocker signal may be bandpass filtered from the amplified input signal. | 08-28-2008 |
| 330133000 | Different bias control means for different stages of cascade amplifier | 10 |
| 20090033416 | METHOD AND SYSTEM FOR POLAR MODULATING QAM SIGNALS WITH DISCONTINUOUS PHASE - Aspects of a method and system for polar modulating QAM signals with discontinuous phase may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain and an amplitude offset gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the coarse amplitude gain, and a gain of one or more remaining ones of the plurality of amplifiers may be adjusted to set the amplitude offset gain. The setting of the coarse amplitude gain and/or said amplitude offset gain may be adjusted dynamically and/or adaptively. The signal may be generated by phase-modulation of a radio-frequency carrier. The combined gain of the plurality of amplifiers may be controlled based on a desired amplitude modulation. The plurality of amplifiers may be integrated within an integrated circuit (IC) or chip. | 02-05-2009 |
| 20080238542 | Variable gain amplifier and method for achieving variable gain amplification with high bandwidth and linearity - A fine granularity, wide-range variable gain amplifier (“VGA”) comprises an attenuator, a high gain signal path, a low gain signal path and a gain adjustment control to adjust a gain of the VGA, wherein the gain adjustment control is configured to cause a selective activation of at least a portion of the low gain signal path or the high gain signal path to achieve a desired overall gain. | 10-02-2008 |
| 20090179698 | EEFFICIENT INTEGRATED LINEAR AMPLIFIER MODULE - A linear amplifier circuit includes a first matching circuit that receives a first signal and to produce a first impedance matched signal, a first power amplifier that produces a first amplified signal in response to the first impedance matched signal under the control of a first bias signal, a second power amplifier that produces a second amplified signal in response to the first impedance matched signal under the control of a second bias signal, a biasing circuit that produces the first bias signal and the second bias signal. The first power amplifier can be activated by the first biasing signal when the power of the output signal is to exceed a first threshold value. The second power amplifier can be activated by the second biasing signal when the power of the output signal is below a second threshold value. A second matching circuit configured to receive the first amplified signal and the second amplified signal, and to produce an output signal. | 07-16-2009 |
| 20090322423 | METHOD AND SYSTEM FOR POLAR MODULATING QAM SIGNALS WITH DISCONTINUOUS PHASE - Aspects of a method and system for polar modulating QAM signals with discontinuous phase may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain and an amplitude offset gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the coarse amplitude gain, and a gain of one or more remaining ones of the plurality of amplifiers may be adjusted to set the amplitude offset gain. The setting of the coarse amplitude gain and/or said amplitude offset gain may be adjusted dynamically and/or adaptively. The signal may be generated by phase-modulation of a radio-frequency carrier. The combined gain of the plurality of amplifiers may be controlled based on a desired amplitude modulation. The plurality of amplifiers may be integrated within an integrated circuit (IC) or chip. | 12-31-2009 |
| 20090033415 | METHOD AND SYSTEM FOR AMPLITUDE CALIBRATION FOR POLAR MODULATION WITH DISCONTINUOUS PHASE - Aspects of a method and system for amplitude calibration for polar modulation with discontinuous phase may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain, an amplitude offset gain and a calibration gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the coarse amplitude gain, and a gain of one or more remaining ones of the plurality of amplifiers may be adjusted to set the amplitude offset gain and the calibration gain. The setting of the coarse amplitude gain, the calibration gain and/or said amplitude offset gain may be adjusted dynamically and/or adaptively. | 02-05-2009 |
| 20090033417 | METHOD AND SYSTEM FOR POLAR MODULATION WITH DISCONTINUOUS PHASE FOR RF TRANSMITTERS WITH POWER CONTROL - Aspects of a method and system for polar modulation with discontinuous phase for RF Transmitters with power control may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain, a power level gain and an amplitude offset gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the coarse amplitude gain and the power level gain. A gain of one or more remaining ones of the plurality of amplifiers may be adjusted to set the amplitude offset gain. The setting of the coarse amplitude gain, the power level gain and/or the amplitude offset gain may be adjusted dynamically and/or adaptively. | 02-05-2009 |
| 20100301935 | BIAS CIRCUIT, HIGH-POWER AMPLIFIER, AND PORTABLE INFORMATION TERMINAL - To provide a bias circuit for gain control that can reduce gain variation at low-power output, facilitate setting of output power, and is unlikely to be affected by variation in element values and variations among products. Use in an HPA having three bias circuits serially-connected is assumed. Current of the third bias circuit is varied with a square-law characteristic. The square-law characteristic is amplified by a buffer amplifier including a linear amplifier and a peripheral circuit thereof. Output current of the third bias circuit varies depending on a current drivability coefficient of the diode-connected FET branched from the connection point between a constant current source and the linear amplifier. The output current of the third bias circuit is controlled by providing a circuit that draws a certain amount of current from the current flowing in the FET. | 12-02-2010 |
| 20090174475 | Smart linearized power amplifier and related systems and methods - A power amplifier subsystem that includes a first stage amplifier and a second stage amplifier. A first bias circuit is coupled to the first stage amplifier, and the first bias circuit has a variable impedance that increases with radio frequency (RF) power. A second bias circuit is coupled to the second stage amplifier, and the second bias circuit has impedance relatively fixed with respect to radio frequency (RF) power. According to an embodiment of the invention, the first bias circuit comprises a transistor having a collector current that increases as radio frequency (RF) power increases. The second bias circuit can have a relatively fixed impedance. A method of designing an amplifier subsystem, where transistor size and resistor values are selected to obtain the desired bias and linearity characteristics, or transistor size and resistor values are selected to operate within a selected range, and amplifier performance is adjusted by changing the bias control voltage. | 07-09-2009 |
| 20090033414 | METHOD AND SYSTEM FOR POLAR MODULATING OFDM SIGNALS WITH DISCONTINUOUS PHASE - Aspects of a method and system for polar modulating OFDM signals with discontinuous phase may include amplifying an OFDM signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain and an amplitude offset gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the coarse amplitude gain, and a gain of one or more remaining ones of the plurality of amplifiers may be adjusted to set the amplitude offset gain. The setting of the coarse amplitude gain and/or the amplitude offset gain may be adjusted dynamically and/or adaptively. | 02-05-2009 |
| 20100253424 | AMPLIFYING DEVICE AND ITS CONTROL METHOD - An amplifying device comprises a first amplifying unit ( | 10-07-2010 |
| 330134000 | Plural different bias control voltages provided by separate means | 1 |
| 20090002068 | Dynamic Biasing System For An Amplifier - A dynamic biasing system (“DBS”) for dynamically biasing an amplifier with an adjusted bias signal is shown. The DBS may include a first biasing circuit that produces a bias signal and a second biasing circuit in signal communication with both the first biasing circuit and the amplifier, wherein the second biasing circuit compares the bias signal to a predetermined threshold and in response produces the adjusted bias signal. | 01-01-2009 |
| 330135000 | Amplitude limiting or bias voltage | 4 |
| 20090015324 | Power amplifier amplitude modulator system and method - A system for controlling amplifier power is provided. The system includes a voltage envelope detector receiving a voltage signal and generating an attenuated voltage envelope signal. A current envelope detector receives a current signal and generates an attenuated current envelope signal. A controller receives power level data and generates attenuation control data for the voltage envelope signal and the current envelope signal. A detector receives the voltage envelope signal and the current envelope signal and generates a control signal based on the greater of the voltage envelope signal and the current envelope signal. A power amplifier level controller receives the control signal and generates a power amplifier level control signal. | 01-15-2009 |
| 20100321109 | Amplifier Compression Adjustment Circuit - An RF power amplifier system adjusts the supply voltage to the power amplifier based upon an amplitude correction signal indicating the amplitude difference between the amplitude of the RF input signal and an attenuated amplitude of the RF output signal of the power amplifier. A variable gain amplifier (VGA) adjusts the amplitude of the RF input signal, thus providing a second means of adjusting the amplitude of the output of the power amplifier. The gain of the VGA or the supply voltage to the power amplifier is controlled based on the AC components of the amplitude correction signal, while the DC components of the amplitude correction signal are blocked from controlling the VGA or the supply voltage to the power amplifier. The DC level of the gain control of the VGA, the average supply voltage to the power amplifier, or the closed loop gain of the overall amplitude correction loop is controlled separately by a compression control signal. | 12-23-2010 |
| 20100244952 | GAIN CONTROL CIRCUIT AND ELECTRONIC VOLUME CIRCUIT - A gain control circuit includes a comparator that compares an input gain value with a count value to generate a comparison result signal, a counter that counts up or counts down the count value in accordance with the comparison result signal, and a gain modulator circuit that modulates the count value to generate a gain control signal which changes in a time-divided manner. The gain modulator circuit modulates the count value so that a gain obtained by time-averaging a gain corresponding to the gain control signal matches a gain based on the count value. | 09-30-2010 |
| 20120126893 | POWER AMPLIFIER, POWER AMPLIFICATION METHOD, AND STORAGE MEDIUM - This invention provides a power amplifier ( | 05-24-2012 |
| 330136000 | Bias control signal from input of amplifier | 13 |
| 20090195308 | AUTOMATIC GAIN CONTROL CIRCUIT - An automatic gain control circuit includes a first voltage dividing resistor, a filter circuit, a switch circuit, and an amplifying circuit. The first voltage dividing resistor divides a voltage of the automatic gain control circuit using an internal impedance of the audio device to produce a divided DC voltage, wherein the first voltage dividing resistor is connected between a first power source and an output of the audio device. The filter circuit filters audio signals outputted from the audio device to produce filtered audio signals, and wherein the filter circuit receives the divided DC voltage, wherein the filter circuit is connected to the output of the audio device. The switch circuit outputs controlling signals according to the divided DC voltage from the filter circuit. The amplifying circuit amplifies the filtered audio signals according to the controlling signals. An electronic device using the automatic gain control circuit is also provided. | 08-06-2009 |
| 20090189690 | FEED-FORWARD AUTOMATIC-GAIN CONTROL AMPLIFIER (FFAGCA) FOR BIOMEDICAL APPLICATIONS AND AN ASSOCIATED METHOD - The present invention is a feed-forward automatic-gain control amplifier (FFAGCA) for biomedical applications and associated method, the FFAGCA comprises a detector, a controller, a variable gain amplifier (VGA), an input and an output. The associated method to process various kinds of biomedical signals with the FFAGCA comprises acts of adjusting gain setting with control path and simultaneously a signal amplification with signal path. | 07-30-2009 |
| 20120025908 | AUTOMATIC GAIN CONTROL - An automatic gain controller is disclosed. The AGC includes an input for monitoring a signal associated with an amplifier and a gain control circuit for controlling the gain of the amplifier in response to the monitored signal, wherein the gain control circuit is adapted to control the gain of the amplifier in accordance with a gain control function having continuously variable attack and release time constants, both of which depend on the amplitude of the monitored signal. | 02-02-2012 |
| 20120105152 | Joint optimisation of supply and bias modulation - There is disclosed a technique for controlling at least one amplification stage, comprising: selecting a linearity objective for the amplification stage; in dependence on an input signal to said amplification stage, determining a combination of supply input and bias input for the amplification stage in order to meet said linearity objective; and in dependence on there being more than one combination of supply input and bias input for meeting the linearity objective, selecting the combination that optimises a further system performance objective for the amplification stage. The further system performance objective may be one or more of: an efficiency objective; an envelope signal bandwidth objective; or a robustness to production tolerance objective. | 05-03-2012 |
| 20090184764 | POWER SUPPLY PROVIDING ULTRAFAST MODULATION OF OUTPUT VOLTAGE - A circuit for use with a power amplifier that amplifies an input signal. The circuit may comprise an amplitude correction circuit and an open-loop switching regulator. The amplitude correction circuit may be configured to generate a corrected envelope signal from an input envelope signal that represents an envelope of the input signal. The open-loop switching regulator may be connected to the amplitude correction circuit and may be for powering the power amplifier based on the corrected envelope signal. According to various embodiments, the corrected envelope signal generated by the amplitude correction circuit is a function of the input envelope signal and an error voltage of the open-loop switching regulator. | 07-23-2009 |
| 20090140805 | Voltage Regulator For Biasing Current-To-Voltage Amplifiers - A voltage regulator, comprising an analog amplifier, a noise filter and a signal compensator, is disclosed. The noise filter for receives a first signal containing alternating current (AC) noise in which the noise filter substantially filters the AC noise from the first signal to thereby produce a second signal. The voltage regulator regulates the second signal to thereby generate a third signal therefrom. The third signal is substantially noise-free and is provided as a biasing voltage to the analog amplifier. The first signal is further provided to for amplification by the analog amplifier based on amplification characteristics of the analog amplifier and the amplification characteristics of the analog amplifier is determined by the biasing voltage provided to the analog amplifier. | 06-04-2009 |
| 20100219888 | AMPLIFIER CIRCUIT - An amplifier circuit comprises an input, for receiving an input signal to be amplified; a preamplifier, for amplifying the input signal based on a variable gain; a power amplifier for amplifying the signal output from the preamplifier, and a variable voltage power supply for supplying one or more supply voltages to the power amplifier. The supply voltages are adjusted based on the variable gain or the input digital signal. According to other aspects of the invention, a power supply of an amplifier circuit is clocked using a clock signal, whereby the clock signal has a frequency that varies in accordance with a volume signal or an input signal. | 09-02-2010 |
| 20080284510 | ERROR DRIVEN RF POWER AMPLIFIER CONTROL WITH INCREASED EFFICIENCY - A power amplifier controller for adjusting a supply voltage to a power amplifier. The power amplifier controller adjusts the supply voltage so that distortion in an RF output signal corresponds to a predetermined limit. An amplitude error signal is generated by the power amplifier controller which represents a difference between an RF output signal and an attenuated RF output signal. The AC components of the amplitude error signal are processed to generate a deviation signal that represents the distortion in the RF output signal. The supply voltage to the power amplifier is increased when the deviation signal exceeds a distortion level control signal, and decreased when the deviation signal drops below the distortion level control signal. | 11-20-2008 |
| 20080278231 | AMPLIFIER - An object of the present invention is, in a high-frequency amplifier using a semiconductor device as an amplifying device, to achieve a high efficiency by controlling input/output matching circuits so that they are always optimized, when a bias voltage applied to the semiconductor device is controlled to correspond to an envelope of a signal. The bias voltage that is applied to the semiconductor device for amplification is changed to corresponding to the envelope of the signal using a bias control circuit, control voltages for controlling impedance of input/output matching circuits are created from the bias voltage, and the bias voltage and the control voltages that are used to control the impedance of the input/output matching circuits of semiconductor device | 11-13-2008 |
| 20080238543 | Digital Amplifier with Analogue Error Correction Circuit - Digital amplifier for amplifying a digital input signal, comprising a digital modulator for converting the digital input signal into an amplitude-discrete and temporally analogue signal, comprising an analogue error correction circuit which modulates the pulse widths of the amplitude-discrete and temporally analogue signal in dependence on an analogue error signal, comprising a power switching stage, the input of which receives the signal modulated by the error correction circuit and which delivers the modulated signal amplified at an output and comprising an analogue feedback circuit which, in dependence on the output signal of the digital modulator and on the output signal of the power switching stage, generates the analogue error signal for adjusting the analogue error correction circuit. | 10-02-2008 |
| 20120025907 | POWER AMPLIFIER - There is provided a power amplifier capable of supplying variable bias to an amplifier circuit by accurately transferring the envelope components of an input signal during the supply of active bias power to the amplifier circuit. The power amplifier includes: an envelope detector detecting an envelope of an input signal; a bias power generator including at least one P-type MOSFET and one N-type MOSFET connected to each other in an inverter manner between a driving power terminal supplying driving power having a preset voltage level and a reference bias power terminal supplying preset reference bias power to generate bias power varied according to detection results from the envelope detector; and an amplifier amplifying the input signal according to the bias power level from the bias power generator. | 02-02-2012 |
| 20100019844 | HIGH EFFICIENCY PRECISION AMPLIFIER - A high efficiency precision amplifier which comprises a linear amplifier stage, a class D amplifier stage and a set of switches is provided. Both amplifier stages receive the same input signal. The load is driven by the output of the linear amplifier stage. The set of switches connect the output of the class D amplifier stage to either of the positive and negative supply terminals of the linear amplifier stage and the other of the positive and negative supply terminals of the linear amplifier stage to a negative or positive supply, depending on the polarity of the signal being amplified. | 01-28-2010 |
| 20080297246 | Polar amplifier - An amplifier circuit receives a phase modulated signal at an input node. The power supply terminal of the amplifier circuit is modulated in accordance with an amplitude envelope signal. The voltage on the power supply terminal is modulated using one or more linear regulators depending on the magnitude of the envelope signal. | 12-04-2008 |
| 330139000 | Electronic tube controls bias | 1 |
| 20090021304 | Model based distortion reduction for power amplifiers - A method of processing a signal is disclosed. The method comprises generating a digital signal, converting the digital signal to an analog signal, and generating an amplified analog signal having distortions. The method further comprises converting the amplified analog signal to a feedback digital signal at a sample rate and updating a model of the distortions based on the feedback digital signal. | 01-22-2009 |
| 330140000 | Rectifier in bias control circuit | 1 |
| 20080218261 | RF Power Amplifier Mirror Circuit for Sensing Current - An apparatus and method is disclosed for providing a mirror circuit for detecting a change in current of a RF power amplifier. The mirror circuit includes a voltage operably coupled with the mirror circuit, a bias circuit operably coupled with the mirror circuit, wherein the bias circuit is capable of applying a bias voltage to the mirror circuit, and an output reference signal. The output reference signal is proportional to the change of current in the RF power amplifier. | 09-11-2008 |
