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31results about "Phase feedback adaptive predistortion" patented technology
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Distortion compensating apparatus
InactiveUS20050047521A1Shorten distortion compensation coefficient updating intervalConstant gainAmplifier modifications to reduce non-linear distortionPhase feedback adaptive predistortionPhase correctionPhase difference
A distortion compensating apparatus calculates a distortion compensation coefficient in such a manner that a difference signal between a reference signal, which is a transmit signal, and a feedback signal will be diminished, updates an old distortion compensation coefficient by the calculated distortion compensation coefficient and applies distortion compensation to the transmit signal based upon this distortion compensation coefficient. In this apparatus, a phase correcting interval, which is for correcting the phase difference between the reference signal and the feedback signal, and a distortion compensation coefficient updating interval are generated alternately, a correction is applied so as to null the phase difference in the phase correcting interval, and the distortion compensation coefficient is updated in the distortion compensation coefficient updating interval.
Owner:FUJITSU LTD
RF power amplifier system with impedance modulation
ActiveUS7782134B2Improve efficiencyReduce phase distortionHigh frequency amplifiersGain controlAudio power amplifierAmplitude control
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.
Owner:QUANTANCE
RF power amplifier system with impedance modulation
ActiveUS8018277B2Improve efficiencyReduce phase distortionHigh frequency amplifiersGain controlAudio power amplifierAmplitude control
Owner:QUANTANCE
Control system for a power amplifier
ActiveUS20150054582A1Minimise measured powerMinimize powerAmplifier modifications to reduce non-linear distortionHigh frequency amplifiersAudio power amplifierPhase difference
An apparatus for controlling the gain and phase of an input signal input to a power amplifier comprises a gain control loop configured to control the gain of the input signal based on power levels of the input signal and an amplified signal output by the power amplifier, to obtain a predetermined gain of the amplified signal, and a phase control loop configured to obtain an error signal related to a phase difference between a first signal derived from the input and a second signal derived from the amplified signal, and control the phase based on the error signal, to obtain a predetermined phase of the amplified signal. The phase control loop delays the first signal, such that the delayed first signal and the second signal used to obtain the error signal correspond to the same part of the input signal. The apparatus may be included in a satellite.
Owner:ASTRIUM GMBH
Signal extraction circuit and distortion-compensated amplifier incorporating the same
InactiveUS7456688B2Excellent distortion compensating characteristicRemove distortionAmplifier modifications to reduce non-linear distortionNegative-feedback-circuit arrangementsAudio power amplifierAcoustics
To cancel a reflected wave reflected from a connecting portion (22) and leaking into a feedback signal when a non-matched component is connected, the reflected wave is extracted by a circulator (30) and its phase and amplitude are adjusted by a vector adjusting circuit (32), and then the thus adjusted reflected wave is vector-summed with the feedback signal in a vector sum circuit (34).
Owner:FUJITSU LTD
RF power amplifier system with impedance modulation
ActiveUS20110043282A1Improve efficiencyReduce phase distortionHigh frequency amplifiersGain controlAudio power amplifierAmplitude control
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.
Owner:QUANTANCE
Smart power combiner
InactiveUS8952752B1Removing “guesswork”Benefit is economical and compactNegative-feedback-circuit arrangementsAmplifier combinationsAudio power amplifierPower combiner
Owner:CUBIC CORPORATION
Weighted memory polynomial method and system for power amplifiers predistortion
InactiveUS20170047899A1Amplifier modifications to reduce non-linear distortionHigh frequency amplifiersAudio power amplifierDevice under test
A system and method for linearizing a power amplifier using digital predistortion technique is provided including processing circuitry, the processing circuitry configured to apply a digital predistortion function based on a weighted static polynomial function, a weighted dynamic polynomial function and a threshold parameter which splits the nonlinear transfer characteristics of the device under test into a region where the static nonlinearity predominates and a region where the dynamic distortions predominate.
Owner:KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
Weighted memory polynomial method and system for power amplifiers predistortion
ActiveUS20160126903A1Amplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influenceAudio power amplifierDevice under test
A system and method for linearizing a power amplifier using digital predistortion technique is provided including processing circuitry, the processing circuitry configured to apply a digital predistortion function based on a weighted static polynomial function, a weighted dynamic polynomial function and a threshold parameter which splits the nonlinear transfer characteristics of the device under test into a region where the static nonlinearity predominates and a region where the dynamic distortions predominate.
Owner:KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
Phase noise correction device and its method
InactiveUS20100097151A1Accurate detectionDetect the phase noise component more accuratelyPulse automatic controlAngle modulation detailsPhase noiseSoftware engineering
A phase noise correction device having a function for accurately detecting a phase noise component and capable of reducing a load on a reception device is provided. A phase noise correction device for correcting a phase noise generated in a local oscillator includes: a division section that divides a signal generated in the local oscillator; a reference signal generation section that generates a signal of the same frequency as that of the divided signal; a phase difference detection section that detects a phase difference between the divided signal and the generated reference signal; and a phase noise correction section that gives a phase rotation to a baseband signal in the direction that cancels the phase noise according to the detected phase difference as a phase noise component.
Owner:NEC CORP
RF power amplifier system with impedance modulation
ActiveUS20100060357A1Improve efficiencyEfficiency of PA is improvedHigh frequency amplifiersGain controlAmplitude controlImpedance matching
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.
Owner:QUANTANCE
Phase noise correction device and its method
InactiveUS8093943B2Detect the phase noise component more accuratelyAccurate detectionPulse automatic controlAngle modulation detailsPhase noisePhase difference
A phase noise correction device having a function for accurately detecting a phase noise component and capable of reducing a load on a reception device is provided. A phase noise correction device for correcting a phase noise generated in a local oscillator includes: a division section that divides a signal generated in the local oscillator; a reference signal generation section that generates a signal of the same frequency as that of the divided signal; a phase difference detection section that detects a phase difference between the divided signal and the generated reference signal; and a phase noise correction section that gives a phase rotation to a baseband signal in the direction that cancels the phase noise according to the detected phase difference as a phase noise component.
Owner:NEC CORP
RF power amplifier controlled by estimated distortion level of output signal of power amplifier
ActiveUS8014735B2Reduce circuit complexityFast response timeResonant long antennasPhase feedback adaptive predistortionAudio power amplifierEngineering
A radio frequency (RF) power amplifier system is provided, in which a distortion of the RF output signal from the power amplifier is estimated by comparing the RF output signal with reference modulation information. The supply voltage to the power amplifier is adjusted so that the estimated distortion of the RF output signal corresponds to a predetermined distortion level. The predetermined distortion level is set to represent an acceptable distortion level at the RF output signal.
Owner:QUANTANCE
Method and system for linearizing an amplifier using transistor-level dynamic feedback
ActiveUS20150207467A1Amplifier modifications to reduce non-linear distortionAmplifier with control circuitsAudio power amplifierNonlinear amplifier
The present disclosure describes a method and system for linearizing an amplifier using transistor-level dynamic feedback. The method and system enables nonlinear amplifiers to exhibit linear performance using one or more of gain control elements and phase shifters in the feedback path. The disclosed method and system may also allow amplifiers to act as a pre-distorter or a frequency / gain programmable amplifier.
Owner:DARWISH ALI MOHAMED
Distortion compensating apparatus
InactiveUS7639755B2Favorable, stabilized distortion compensating operationFast convergenceAmplifier modifications to reduce non-linear distortionPhase feedback adaptive predistortionPhase correctionPhase difference
Owner:FUJITSU LTD
Systems and methods for signal predistortion
ActiveUS20170070196A1Improve the level ofEasy to operateAmplifier modifications to reduce non-linear distortionModulated-carrier systemsAudio power amplifierEngineering
A single or multistage signal predistorter includes an input coupled to receive an information signal comprising input samples and an output coupled to the high power amplifier, the signal predistorter configured to receive an input sample, generate a distortion sample based on an estimate of nonlinearity of the high power amplifier at an operating saturation level, modify the input sample with a correction term to generate a predistortion signal, wherein the correction term is proportional to the distortion sample, and further wherein the predistortion signal comprises the information signal modified to account for nonlinearities in the high power amplifier.
Owner:HUGHES NETWORK SYST
Method and system for linearizing an amplifier using transistor-level dynamic feedback
ActiveUS20190280654A1Amplifier modifications to reduce non-linear distortionAmplifier with control circuitsAudio power amplifierEngineering
The present disclosure describes a method and system for linearizing an amplifier using transistor-level dynamic feedback. The method and system enables nonlinear amplifiers to exhibit linear performance using one or more of gain control elements and phase shifters in the feedback path. The disclosed method and system may also allow an amplifier to act as a pre-distorter or a frequency / gain programmable amplifier.
Owner:DARWISH ALI MOHAMED
Systems and methods for signal predistortion
ActiveUS9577588B1Improve the level ofSuppression of distortionAmplifier modifications to reduce non-linear distortionModulated-carrier systemsAudio power amplifierEngineering
A single or multistage signal predistorter includes an input coupled to receive an information signal comprising input samples and an output coupled to the high power amplifier, the signal predistorter configured to receive an input sample, generate a distortion sample based on an estimate of nonlinearity of the high power amplifier at an operating saturation level, modify the input sample with a correction term to generate a predistortion signal, wherein the correction term is proportional to the distortion sample, and further wherein the predistortion signal comprises the information signal modified to account for nonlinearities in the high power amplifier.
Owner:HUGHES NETWORK SYST
Control system for a power amplifier
ActiveUS9634631B2Minimize powerAmplifier modifications to reduce non-linear distortionNegative-feedback-circuit arrangementsAudio power amplifierControl system
An apparatus for controlling the gain and phase of an input signal input to a power amplifier comprises a gain control loop configured to control the gain of the input signal based on power levels of the input signal and an amplified signal output by the power amplifier, to obtain a predetermined gain of the amplified signal, and a phase control loop configured to obtain an error signal related to a phase difference between a first signal derived from the input and a second signal derived from the amplified signal, and control the phase based on the error signal, to obtain a predetermined phase of the amplified signal. The phase control loop delays the first signal, such that the delayed first signal and the second signal used to obtain the error signal correspond to the same part of the input signal. The apparatus may be included in a satellite.
Owner:ASTRIUM GMBH
Weighted memory polynomial method and system for power amplifiers predistortion
ActiveUS9461597B2Amplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influenceAudio power amplifierEngineering
A system and method for linearizing a power amplifier using digital predistortion technique is provided including processing circuitry, the processing circuitry configured to apply a digital predistortion function based on a weighted static polynomial function, a weighted dynamic polynomial function and a threshold parameter which splits the nonlinear transfer characteristics of the device under test into a region where the static nonlinearity predominates and a region where the dynamic distortions predominate.
Owner:KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
Configurable non-linear filter for digital pre-distortion
ActiveUS20220131506A1Provide flexibilityReduce manufacturing costAmplifier modifications to reduce non-linear distortionDigital technique networkNonlinear filterCrossbar switch
Some embodiments herein describe a radio frequency communication system that can include a transmitter to output an radio frequency (RF) transmit signal, the transmitter including a digital pre-distortion system (DPD) that pre-distorts the RF transmit signal. The DPD system can include a configurable non-linear filter, such as a Laguerre filter, having multiple rows where at least one row operates with a configurable decimation ratio. The DPD system can further include decimators and a crossbar switch coupled between the decimators.
Owner:ANALOG DEVICES INT UNLTD
Method and system for linearizing an amplifier using transistor-level dynamic feedback
ActiveUS10979001B2Amplifier modifications to reduce non-linear distortionAmplifier with control circuitsSoftware engineeringMechanical engineering
The present disclosure describes a method and system for linearizing an amplifier using transistor-level dynamic feedback. The method and system enables nonlinear amplifiers to exhibit linear performance using one or more of gain control elements and phase shifters in the feedback path. The disclosed method and system may also allow an amplifier to act as a pre-distorter or a frequency / gain programmable amplifier.
Owner:DARWISH ALI MOHAMED
Amplifier linearity boost circuits and methods for post distortion feedback cancelation
PendingCN110690862AAmplifier modifications to reduce non-linear distortionNegative-feedback-circuit arrangementsHemt circuitsCurrent generator
An amplifier circuit is provided that includes an amplifier having a signal input and a signal output, the amplifier being configured to produce an amplified signal at the signal output, a feedback path coupled between the signal output and the signal input, and an amplifier linearity boost circuit positioned in the feedback path. The amplifier linearity boost circuit includes a non-linear currentgenerator and a phase-shifting circuit, the non-linear current generator being configured to provide a non-linear current based on the amplified signal, and the phase-shifting circuit being configured to adjust a phase of the non-linear current to reduce an intermodulation distortion of the amplified signal.
Owner:SKYWORKS SOLUTIONS INC
Apparatus and method for digital pre-distortion in wireless communication system
ActiveUS20160079932A1Improve performanceReduce complexityAmplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influenceCommunications systemAudio power amplifier
Provided is a Digital Pre-Distortion (DPD) apparatus and method for processing a signal that is input to a power amplifier in a wireless communication system. The DPD apparatus includes a DPD unit configured to pre-distort an input signal that is input to the power amplifier, using DPD information; and a signal processor configured to capture signals for estimation of the DPD information from each of an input terminal and an output terminal of the power amplifier, detect peak signals of the captured signals, separate the detected peak signals into a plurality of intervals depending on a power level, separately store the detected peak signals, estimate the DPD information using the peak signals stored for each interval, and provide the estimated DPD information to the DPD unit.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and device in a telecommunication system
InactiveCN1168201CGuaranteed stabilityReduced boundary requirementsAmplifier modifications to reduce non-linear distortionNegative-feedback-circuit arrangementsTelecommunicationsControl system
According to the invention, a Cartesian control means (16) comprising a phase rotator (50) and a phase adjuster (52) is provided. With a method and a device according to the invention, a system is provided that is unconditionally stable with respect to non-phase alignment, regardless of input power changes, temperature and component ageing. No certain conditions need to be placed upon the control system to ensure stability, i.e. the system is non-obtrusive and requires no off-line calibration. The inclusion of the phase rotator (50) and phase adjustment techniques into the Cartesian control system makes this possible.
Owner:TELEFON AB LM ERICSSON (PUBL)
Machine learning based digital pre-distortion for power amplifiers
PendingCN113809992AAmplifier modifications to reduce non-linear distortionHigh frequency amplifiersAudio power amplifierControl engineering
Example embodiments relate to machine learning based digital pre-distortion for power amplifiers. A device may amplify a signal with a power amplifier and transmit the signal. The signal may be received by an internal feedback receiver of the device. The device may further comprise a first machine learning model configured to emulate an external feedback receiver and to generate an emulated feedback signal based on the internal feedback signal. The device may further comprise a second machine learning model configured to determine digital pre-distortion parameters for the power amplifier based on the emulated feedback signal. Apparatuses, methods, and computer programs are disclosed.
Owner:NOKIA TECHNOLOGLES OY
Cancellation of oscillator remodulation
ActiveUS20110034136A1Reduce remodulationRemodulation by the transmitter output signal can be reduced or eliminatedResonant long antennasModulated-carrier systemsAudio power amplifierSignal generator
A wireless transmitter (100) comprises a signal generator (10) for generating a signal, an amplifier (50) for amplifying the signal, and a phase shifting circuit (20) coupled between the signal generator (10) and the amplifier (50) and arranged to shift the phase of the signal to cancel remodulation of the signal generator (10) by the amplified signal.
Owner:NXP BV
Configurable non-linear filter for digital pre-distortion
PendingCN114499461AAmplifier modifications to reduce non-linear distortionModulated-carrier systemsNonlinear filterCrossbar switch
The invention relates to a configurable non-linear filter for digital pre-distortion. Some embodiments herein describe a radio frequency communication system that may include a transmitter that outputs a radio frequency (RF) transmit signal, the transmitter including a digital pre-distortion system (DPD) that pre-distorts the RF transmit signal. The DPD system may include a configurable non-linear filter, such as a Laguerre filter, having a plurality of rows, where at least one row operates at a configurable decimation ratio. The DPD system may also include dividers and a crossbar switch coupled between the dividers.
Owner:ANALOG DEVICES INT UNLTD
Cancellation of oscillator remodulation
ActiveUS8200170B2Remodulation by the transmitter output signal can be reduced or eliminatedResonant long antennasModulated-carrier systemsAudio power amplifierEngineering
A wireless transmitter (100) comprises a signal generator (10) for generating a signal, an amplifier (50) for amplifying the signal, and a phase shifting circuit (20) coupled between the signal generator (10) and the amplifier (50) and arranged to shift the phase of the signal to cancel remodulation of the signal generator (10) by the amplified signal.
Owner:NXP BV
Method and system for linearizing an amplifier using transistor-level dynamic feedback
ActiveUS20170040954A1Constant gainConstant shiftAmplifier modifications to reduce non-linear distortionAmplifier with control circuitsAudio power amplifierNonlinear amplifier
The present disclosure describes a method and system for linearizing an amplifier using transistor-level dynamic feedback. The method and system enables nonlinear amplifiers to exhibit linear performance using one or more of gain control elements and phase shifters in the feedback path. The disclosed method and system may also allow an amplifier to act as a pre-distorter or a frequency / gain programmable amplifier.
Owner:DARWISH ALI MOHAMED
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