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38results about How to "Improve linearization performance" patented technology
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Method and system for broadband predistortion linearization
InactiveUS20060240786A1Improve linearization performanceExtends linearization bandwidthAmplifier modifications to reduce non-linear distortionAmplifiers with memory effect compensationTime domainRadio frequency
The invention relates to a method and system for wideband digital pre-distortion linearization, which is used to overcome the influence of memory effect in radio frequency power amplifier, to expand digital pre-distortion linearization bandwidth, and to improve digital pre-distortion linearization performance. The method and system can get an in-band pre-distortion signal and an out-of-band pre-distortion signal according to the characteristic parameter of the amplifier; the in-band pre-distortion signal is up-converted and the up-converted signal is added to the out-of-band pre-distortion signal, which is not up-converted, then the combined signal is inputted to the power amplifier as an input signal; a part of the output signal from the power amplifier, serving as a feedback signal, can be compared with the original input signal, and the characteristic parameter of the amplifier for generating the in-band pre-distortion signal and the out-of-band pre-distortion signal is adaptively regulated according to the comparison result, so that the waveform of time domain or the frequency domain of the feedback signal can be close to that of the original input signal as much as possible.
Owner:ZTE CORP
Method and system for broadband predistortion linearization
InactiveUS7583754B2Remove to bandwidthLower performance requirementsAmplifier modifications to reduce non-linear distortionAmplifiers with memory effect compensationTime domainAudio power amplifier
Owner:ZTE CORP
Method and system for out of band predistortion linearization
InactiveUS7848717B2Facilitates and simplifies design and applicationScope of application is limitedResonant long antennasModulated-carrier systemsNonlinear distortionIntermediate frequency
The present invention discloses a method and a system for out-of-band predistortion linearization, comprising steps of: dividing base band inputted or intermediate frequency signal into an in-band signal branch and an out-of-band signal branch; processing the in-band signal to form RF (Radio Frequency) signal; processing the out-of-band signal to form out-of-band predistortion signal for pre-compensating the in-band signal; adding the in-band signal with the out-of-band predistortion signal, and taking the result as the input of RF power amplifier. The present invention compensates the nonlinear distortion of the RF power amplifier by a way of out-of-band compensating signal in a wireless communication environment, thereby avoiding the limitation of improving performance of conventional predistortion method, and solving the limitation of bandwidth and capability of the predistortion system caused by memory effect.
Owner:ZTE CORP
Digital predistortion apparatus and method for improving performance using peak level expansion
InactiveUS20110221527A1Improve performanceImprove linearization performanceAmplifier modifications to reduce noise influenceAmplifier modifications to reduce temperature/voltage variationEngineeringPeak value
A method an apparatus improve linearization performance and reduce a convergence time of a Digital Pre-Distorter of a power amplifier. An input signal is received. A peak level of the input signal is expanded based on an expansion threshold. And the expanded peak level of the input signal is linearized through Digital Pre-Distorter (DPD) training on the expanded input signal.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and System for out of Band Predistortion Linearization
InactiveUS20080106333A1Facilitates and simplifies designFacilitates and simplifies and applicationResonant long antennasModulated-carrier systemsNonlinear distortionIntermediate frequency
The present invention discloses a method and a system for out-of-band predistortion linearization, comprising steps of: dividing base band inputted or intermediate frequency signal into an in-band signal branch and an out-of-band signal branch; processing the in-band signal to form RF (Radio Frequency) signal; processing the out-of-band signal to form out-of-band predistortion signal for pre-compensating the in-band signal; adding the in-band signal with the out-of-band predistortion signal, and taking the result as the input of RF power amplifier. The present invention compensates the nonlinear distortion of the RF power amplifier by a way of out-of-band compensating signal in a wireless communication environment, thereby avoiding the limitation of improving performance of conventional predistortion method, and solving the limitation of bandwidth and capability of the predistortion system caused by memory effect.
Owner:ZTE CORP
Mixed double-frequency digital pre-distortion model method based on DDR
InactiveCN107895074ACompensation for Nonlinear Intermodulation DistortionImprove modeling accuracyComplex mathematical operationsModel methodSimulation
The invention provides a mixed double-frequency digital pre-distortion model method based on the DDR. The method includes the following steps that a concurrent double-frequency DPD system based on indirect learning is built; an operation sequence is optimized, a one-dimensional LUT achievement model of the 2D-MP is obtained, a one-dimensional LUT achievement model of 2D-MMP is derived, and then aone-dimensional LUT high-frequency concurrent double-frequency DPD achievement scheme and a model are provided; a dynamic deviation function is substituted into a one-order model of the DDR, and a discrete equivalent baseband expression of the one-order DDR model is obtained and extended to be in a synchronic double-frequency mode; a two-dimensional memory polynomial model same-order envelope cross term is introduced, and a new model and a one-dimensional LUT achievement method of the model in an FPGA are obtained. According to the method, the modeling accuracy and the linearization performance better than a simplified two-dimensional memory polynomial model and a traditional DDR model can be obtained; meanwhile, the advantage that achievement can be conveniently conducted through a one-dimensional lookup table is kept, the new model has a good level in the aspects of performance and complexity, and the method is suitable for practical system applying.
Owner:CHONGQING VOCATIONAL INST OF ENG
Digital predistortion system and method of millimeter wave wideband power amplifier
ActiveCN107592083ALighten the implementation burdenAchieve linearizationAmplifier modifications to reduce non-linear distortionPower amplifiersDigital signal processingAudio power amplifier
The invention discloses a digital predistortion system of a millimeter wave wideband power amplifier. The digital predistortion system comprises a digital predistortion module, a digital-to-analog converter, an up-converter, a power amplifier, a feedback loop, an analog-to-digital converter and a model extraction module. The invention also discloses a digital predistortion method of a millimeter wave wideband power amplifier. Through adoption of the digital predistortion system and method, linearization of a millimeter wave power amplifier excited with a large bandwidth signal is realized by avery limited digital signal processing rate; a good linearization effect is achieved; and the implementation burden of a digital signal processing module is lowered. The digital predistortion systemand method have broad prospects in 5G millimeter wave application.
Owner:SOUTHEAST UNIV
Method and apparatus for determining validity of samples for digital pre-distortion apparatus
ActiveUS9787335B1Correction coefficientLow costSecret communicationTransmitter/receiver shaping networksAudio power amplifierComputer science
A method and an apparatus for determining validity of samples for a digital pre-distortion apparatus is disclosed. It is an object of at least one embodiment to provide a method and an apparatus for determining validity of samples for a digital pre-distortion apparatus that is configured to compensate for nonlinearity of a power amplifier in an efficient manner by accurately estimating a pre-distortion coefficient with a low-capacity memory.
Owner:KMW INC +1
Method and device for eliminating clock jitter in analog-to-digital conversion and digital pre-distortion method
ActiveCN103346792AImprove conversion accuracyEliminate clock jitterAmplifier modifications to reduce non-linear distortionPhysical parameters compensation/preventionComputer moduleAnalog signal
The invention discloses a method and device for eliminating clock jitter in analog-to-digital conversion and a digital pre-distortion method and relates to the pre-distortion technology in the communication field. The method for eliminating clock jitter in analog-to-digital conversion is characterized by comprising the steps that step 1, an analog signal z (t) is received; step 2, a clock signal h (t) is offered to an analog-to-digital conversion module, meanwhile, an arithmetic product of the clock signal h (t) and a single-tone signal m (t) serves as a reference signal q (t) and is added to the analog signal z (t), so that a composite signal r (t) is obtained; step 3, analog-to-digital conversion is conducted on the composite signal r (t) through the analog-to-digital conversion module, so that two completely identical composite signals rjit (n) are obtained; step 4, after a jitter sequence of one of the two composite signals rjit (n) is estimated, a clock jitter sequence is obtained; step 5, clock jitter elimination is conducted on the other of the two composite signals rjit (n) through clock jitter sequence, so that a purified digital signal y (n) with clock jitter eliminated is obtained.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Universal and output-adjustable thermistor linear compensation circuit based on audion
InactiveCN104764539AImprove linearization performanceGood linearization compensation effectThermometers using electric/magnetic elementsUsing electrical meansElectrical resistance and conductanceThermistor
A universal and output-adjustable thermistor linear compensation circuit based on an audion comprises a sensing adjustment module, a voltage constant module, a feedback amplification module, a linear compensation circuit and an output amplification module, wherein an output end of the sensing adjustment module is connected with the input end of the feedback amplification module, the output end of the feedback amplification module is connected with the input end of the output amplification module, the output end of the output amplification module is connected with a port 1 of the linear compensation module, an output port 2 of the linear compensation module is connected with the input end of the feedback amplification module, and the input end of the linear compensation module is connected with the output end of the voltage constant module. The universal and output-adjustable thermistor linear compensation circuit based on the audion has the advantages that the linear effect of the circuit is good, the circuit is simple in structure, the conversion flexibility of the circuit is high, and large-scale production is facilitated.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
Method and apparatus for transmitting signal digital predistortion, frequency characteristic compensation and feed forward linearization
InactiveCN1374812AImprove linearization performanceLow costAmplifier modifications to reduce non-linear distortionRadio/inductive link selection arrangementsAudio power amplifierFeedforward amplifiers
In order to linearize the digital signal, two different signals are fed into the correction loop of the feedforward amplifier. One of the signals (the main signal) is pre-distorted and frequency-characteristically compensated before it is sent to the nonlinear amplifier (3). The second signal remains undistorted and is used as a reference signal, which is used to cancel out the main signal portion. These two signals are fed into a correction loop for a highly linearized output signal.
Owner:NOKIA SOLUTIONS & NETWORKS GMBH ＆ CO KG
On-chip integrated broadband linearizer based on variable capacitor
ActiveCN111293991AChange capacitance valueIncrease lossAmplifier modifications to reduce non-linear distortionPower amplifiersHemt circuitsEngineering
The invention discloses an on-chip integrated broadband linearizer based on a variable capacitor, and belongs to the technical field of microwave and millimeter wave monolithic circuits. A linearizedcircuit control module is used for controlling a direct-current voltage drive provided for a reflective pre-distortion signal generator and a cold-mode pHEMT transistor compensation correction circuit, so as to adjust the size of the generated linearized signal. Then, a reflective pre-distortion signal generator and a cold mode pHEMT transistor compensation correction circuit are combined; the pre-distortion signals are generated and compensated, pre-distortion linearized signals are finally generated to counteract nonlinearity of the power amplifier, and the reflective pre-distortion signal generator and the cold mode pHEMT transistor compensation correction circuit are matched with a low-loss matching module to further reduce insertion loss. According to the broadband linearizer, the problem that a traditional linearizer cannot be applied to a broadband is solved, and the bandwidth is better broadened. The filter has the characteristics of low insertion loss, wide application bandwidth, compact structure and remarkable linearization improvement.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Reconfigurable digital pre-distortion system and method of millimeter wave broadband power amplifier
ActiveCN107659273ASave Spectrum ResourcesReduce processing bandwidthAmplifier modifications to reduce non-linear distortionPower amplifiersDigital signal processingAudio power amplifier
The invention discloses a reconfigurable digital pre-distortion system of a millimeter wave broadband power amplifier. The reconfigurable digital pre-distortion system comprises a digital pre-distortion model, a power amplifier, an analog tape limit filter and a model coefficient extraction module, the digital pre-distortion model generates an output signal of the digital pre-distortion model viaan original baseband input signal, the output signal of the digital pre-distortion model is sent to the power amplifier and the model coefficient extraction module, a small part of the signal obtainedby processing the output signal of the power amplifier is also transmitted back to the model coefficient extraction module, and the model coefficient extraction module extracts a digital pre-distortion model coefficient and sends the same to the digital pre-distortion model. The invention further discloses a pre-distortion method using the system. The reconfigurable digital pre-distortion systemcan flexibly select the subcarriers according to demands so as to save spectrum resources; the processing bandwidth necessary for the traditional digital pre-distortion technology is reduced; and thepressure of the existing digital signal processing chip for the high-rate data is reduced.
Owner:SOUTHEAST UNIV
Multi-segment digital pre-distortion system and method based on support vector regression
ActiveCN112804171AImprove linearization performanceReduce complexityAmplifier modifications to reduce non-linear distortionPower amplifiersAlgorithmEngineering
The invention discloses a multi-segment digital pre-distortion system and method based on support vector regression, and the method comprises the steps: carrying out the preprocessing of an input signal through a digital pre-distortion module, enabling the input signal to have a nonlinear characteristic opposite to that of a power amplifier; an output signal in a linear amplification relation with the original input signal is obtained through nonlinear amplification of the power amplifier, and finally linear amplification of the original input signal is achieved. In the process of establishing the digital pre-distortion model, namely establishing the reverse behavior model of the power amplifier, only the function relationship between input and output is concerned and can be regarded as a mathematical modeling problem, and the support vector machine provides a feasible scheme for establishing the behavior model of the power amplifier as an advanced machine learning method. Compared with a common digital pre-distortion method based on support vector regression, the method provided by the invention can improve the speed of pre-distortion module parameter extraction and signal digital pre-distortion processing while keeping the modeling and linearization precision not lower than that of the common digital pre-distortion method based on support vector regression.
Owner:SOUTHEAST UNIV
Linearization for a single power amplifier in a multi-band transmitter
InactiveCN104040883AImprove linearization performanceAvoid high sampling ratesAmplifier modifications to reduce non-linear distortionTransmissionFrequency bandLinearization
A multi-band signal is generated by combining two or more input signals separated in frequency. The input signals are combined either before or after predistortion depending on the bandwidth of the multi-band signal. If the bandwidth of the multi-band signal is less than a predetermined bandwidth threshold, the input signals are combined and predistortion is applied to the combined signal to generate the multi-band signal. If the bandwidth of the multi-band signal is greater than the bandwidth threshold, the individual input signals are predistorted and subsequently combined to generate the multi-band signal.
Owner:OPTIS CELLULAR TECH LLC
Method for increasing linearity of feedforward power amplifier using carrier leakage effect
InactiveCN1725631AImprove linearization performanceReduce hardware complexityAmplifier modifications to reduce non-linear distortionPower amplifiersCarrier signalSelf adaptive
A method for raising linearity of feed forward power amplifier by utilizing carrier leakage effect includes finding out loop convergent initial adapting point to make both counterbalance loops of carrier wave and error be convergent state , searching convergent point of carrier wave leakage effect , adjusting parameters of carrier wave loop and error counterbalance loop to let carrier wave counterbalance loop leak out carrier wave energy and to let error counterbalance loop output inter-modulation signal with minimum power value .
Owner:HUAWEI TECH CO LTD
Nonlinear correction system for bridge sensor
PendingCN114383773AMeet the scene requirements of high precision requirementsReduce nonlinear errorFluid pressure measurementForce/torque/work measurement apparatus calibration/testingConvertersNegative feedback
The invention discloses a nonlinear correction system for a bridge sensor. The nonlinear correction system comprises a piezoresistive bridge sensor, a negative feedback circuit and an output gain amplifier, a negative feedback circuit is introduced to change the excitation voltage of the piezoresistive bridge type sensor and change the amplification factor of an output gain amplifier, so that an original bridge type nonlinear system is compensated; the negative feedback circuit comprises a summation module, a linearization digital-to-analog converter and a feedback amplifier which are connected in sequence, and the feedback voltage is applied to the feedback amplifier; the input end of the summation module receives feedback voltage amplified and converted by a feedback amplifier and a linearization digital-to-analog converter and reference voltage attenuated by an excitation coefficient respectively; excitation voltage output by the summation module is applied to the piezoresistive bridge type sensor. According to the invention, the nonlinear correction system is utilized to compensate the nonlinear characteristic of the piezoresistive bridge sensor, the nonlinear error can be reduced by 50 times, and a good linearization effect is achieved.
Owner:XIAN UNIV OF TECH
Multilevel centralized parameter power distribution circuit for frequency modulation frequency band
PendingCN110311200AImprove balanceImprove isolationWaveguidesPrinted circuit non-printed electric components associationRadio frequencyPhysics
The invention mainly discloses a multilevel centralized parameter power distribution circuit for a frequency modulation frequency band, which can greatly reduce the excessive large distribution circuit area of the frequency modulation frequency band due to the wavelength problem, improve distribution balance, reduce circuit insertion loss and is particularly applicable to high power distributionand multi-antenna distribution circuits in the frequency modulation frequency band. The method is mainly characterized in that the whole circuit is composed of mutual inductance coils, coupling capacitors between self-inductance coils and terminals distributed symmetrically and grounding capacitors; and the whole circuit is small in size and compact in structure without any additional loss causedby other magnetic and other loss devices. The method is further specifically characterized in that the circuit is extended to be composed of a two-level twisted mutual inductance coil, a two-level self-inductance coil, a distributed end-to-end coupling capacitor and a to-ground coupling capacitor on the basis of a single-level twisted mutual inductance coil and a single-level self-inductance coil. The mode can greatly improve the radio frequency bandwidth and greatly reduce the insertion loss.
Owner:杭州长泽科技有限公司
Adaptive sparse pre-distortion structure based on compressed sensing algorithm
PendingCN111884961ASmall distortionImprove linearization performanceCode conversionSynchronous/start-stop systemsEngineeringReconstruction algorithm
The invention discloses an adaptive sparse pre-distortion structure based on a compressed sensing algorithm, and the structure comprises the steps: building a memory effect compensator based on a piecewise linear function double-frequency power amplifier pre-distortion model, and enabling the compressed sensing adaptive sparse reconstruction algorithm to be applied to a pre-distortion system feedback loop; performing compressed sensing sampling in a pre-distortion feedback loop, reconstructing five-order and high-order intermodulation signals by using an adaptive sparsity algorithm APSP, dynamically adjusting an initial value and a step length of sparsity to be close to real sparsity according to the characteristics of feedback loop signals, and restoring the signals at high precision by using a subspace tracking algorithm, so as to improve the coefficient estimation weight, and improve the pre-distortion effect.
Owner:LIAONING TECHNICAL UNIVERSITY
Injection circuit with external predistortion
ActiveCN1728543ARemove distortionReduce memory effectAmplifier modifications to reduce non-linear distortionHigh frequency amplifiersCapacitanceEngineering
The disclosed circuit includes DC isolated capacitor, high frequency choking winding, decoupling capacitor and radio frequency power amplifier. Being passed through DC isolated capacitor, the input signal in radio frequency is output to the input end of the radio frequency power amplifier. The circuit also includes an operational amplifier with high input impedance. A DC bias signal is input to the positive input end of the operational amplifier. Being cascaded to the DC isolated capacitor, envelope signal is connected to negative input end of the operational amplifier. Being cascaded to high frequency choking winding, output end of the operational amplifier is connected to input end of the radio frequency power amplifier, output signal of which is the output of the disclosed circuit. The invention isolates envelope signal in low frequency from DC signal, expands applicable area of frequency suitable to linearization method of envelope injection, and lowers cost of system greatly.
Owner:SANECHIPS TECH CO LTD
Method, device and system for multi-band digital predistortion processing
ActiveCN107707495BImprove linearization performanceSynchronous/start-stop systemsMulti bandNonlinear distortion
Owner:COMBA TELECOM SYST CHINA LTD
Cancellation circuit of electric memory effect of power amplifier
InactiveCN107483020AWeaken the electrical memory effectImprove linearityAmplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influenceCapacitanceElectrode impedance
The invention mainly discloses a cancellation circuit of an electric memory effect of a power amplifier. The method is specifically characterized in that an inductor is added on a transmission electrode of a transistor (or a field-effect tube), a capacitor is added between a base electrode and a collector (or a grid electrode and a drain electrode) of the transistor (or the field-effect tube), wherein the added inductor imports positive voltage feedback, and the capacitor imports negative voltage feedback, so that the depth of the positive feedback or the negative feedback can be changed by adjusting the value of the inductor or the capacitor. When the inductor or the capacitor is a certain fixed value, the fluctuation range of the base electrode impedance of the transistor or the grid electrode impedance of the field-effect tube within the working frequency range is minimum, and at this time, the improvement effect of the electric memory effect of the power amplifier is optimal.
Owner:杭州长泽科技有限公司
Method and device for eliminating clock jitter in analog-to-digital conversion and digital predistortion method
ActiveCN103346792BImprove conversion accuracyEliminate clock jitterAmplifier modifications to reduce non-linear distortionPhysical parameters compensation/preventionAnalog signalComputer science
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Dynamic Linearization System and Method of Power Amplifier Based on Pattern Recognition
ActiveCN109302156BAchieving Dynamic LinearizationImprove linearization performanceAmplifier modifications to reduce temperature/voltage variationPower amplifiersFeature vectorLookup table
The invention discloses a power amplifier dynamic linearization system based on pattern recognition, which includes a feature vector generation module, a multilayer perceptron module, a predistortion coefficient lookup table module, a vector signal module, a transmission link module, a power amplifier module and a feedback loop module. The invention also discloses a method using it. The present invention adopts a new standard, that is, the mode of amplitude modulation to amplitude modulation (AM / AM) to identify the working state of the power amplifier, and uses the recognition result of the power amplifier AM / AM by the multilayer perceptron neural network to index different The pre-distortion coefficient realizes the dynamic linearization of the power amplifier. Compared with traditional power look-up table and power index algorithms, this method can provide better linearization performance. In addition, the present invention can also solve the linearization problem in the dynamic situation of the power amplifier caused by many other non-power factor changes such as temperature, frequency, bandwidth and signal type.
Owner:SOUTHEAST UNIV
Power amplifying system and method for generating pre-distortion signals
InactiveCN100511979CImprove linearization performanceReduce power consumptionAmplifier modifications to reduce non-linear distortionPower amplifiersComputer scienceVolterra series
The invention discloses a power amplifier system and a method for generating a pre-distortion signal. The power amplifier system calculates the transmission digital signal and the feedback digital signal in a digital signal processor (DSP), extracts pre-distortion parameters, and provides the parameters to A pre-distortion chip based on the Volterra series model or its derivative model. The pre-distortion chip uses the Volterra series model and its derivative model to perform pre-distortion processing on the transmitted digital signal to obtain a pre-distortion signal, and then transmit the pre-distortion signal through the The channel is sent to the power amplifier for amplification, and the method can greatly improve the linearity and efficiency of the power amplifier, facilitate the automation of production, and reduce the production cost and maintenance cost.
Owner:HUAWEI TECH CO LTD
Intelligent scene-oriented continuous learning digital pre-distortion system and method
PendingCN114679139AReduced need for model coefficient updatesReduce computing requirementsAmplifier modifications to reduce non-linear distortionNeural architecturesContinual learningLinearity
The invention discloses an intelligent scene-oriented continuous learning digital pre-distortion system and method. The system comprises a configuration adjustment module, a continuous learning digital pre-distortion module, a linearity check module, a training data storage module, a model coefficient extraction module and a target function module. The configuration adjusting module changes configuration of an input signal in real time, the input signal obtains a pre-distortion signal through continuous learning of the digital pre-distortion module, the pre-distortion signal is transmitted to the power amplifier to obtain an output signal, the feedback loop collects the output signal, and the output signal enters the linearity checking module to check the linearity. According to the method, the model coefficient updating requirement of the digital pre-distortion technology in an intelligent scene can be greatly reduced, so that the application cost of the digital pre-distortion technology is reduced.
Owner:SOUTHEAST UNIV
Reducing non-linearities of a phase rotator
ActiveUS11463093B1Improve linearizationReduce non-linearityPulse automatic controlSynchronising arrangementSingle phaseSelf adaptive
Circuits, controllers, and techniques are provided for reducing non-linearities in a phase rotator. A circuit, according to one implementation, includes a single Phase-Locked Loop (PLL) circuit having a main path and a return path forming a feedback loop. The circuit also includes one or more phase rotators connected to an output of the single PLL circuit outside the feedback loop and one or more adaptable Look-Up Tables (LUTs) populated with operating code to be provided to the one or more phase rotators for defining operating characteristics of the one or more phase rotators. Furthermore, the circuit includes a control device configured to receive phase response characteristics from the one or more phase rotators. The control device is further configured to modify the operating code of the one or more adaptable LUTs based on the phase response characteristics to reduce non-linearities of the one or more phase rotators.
Owner:CIENA
Digital pre-distortion system and method for dual-band analog multi-beam millimeter wave transmitter
ActiveCN112073343AImprove linearization performanceHigh level techniquesSynchronous/start-stop systemsSoftware engineeringMillimetre wave
The invention discloses a digital pre-distortion system of a dual-band analog multi-beam millimeter wave transmitter. The system comprises a dual-band multi-beam digital pre-distortion module, a transmitting link, an amplifier, an analog beam forming network, a dual-band digital pre-distortion parameter extraction module and a multi-beam digital pre-distortion parameter extraction module; the dual-band multi-beam digital pre-distortion module is composed of a multi-beam digital pre-distortion module and K dual-band digital pre-distortion modules; multi-beam crosstalk in the system can be effectively processed through multi-beam digital pre-distortion, and dual-band crosstalk and inherent nonlinearity of the power amplifier can be effectively processed through dual-band digital pre-distortion. The invention further discloses a pre-distortion method of the dual-band analog multi-beam millimeter wave transmitter. According to the invention, the problems of multi-beam crosstalk, dual-bandcrosstalk and nonlinearity of the power amplifier can be effectively solved.
Owner:SOUTHEAST UNIV +1
Linearization of a Single Power Amplifier in a Multiband Transmitter
InactiveCN104040883BImprove linearization performanceAvoid high sampling ratesAmplifier modifications to reduce non-linear distortionTransmissionMulti bandAudio power amplifier
Owner:OPTIS CELLULAR TECH LLC
Non-ideal factor correction system for bridge type sensor
ActiveCN114577378ASolve the problem of non-linear outputImprove linearization performanceEfficient power electronics conversionFluid pressure measurement using ohmic-resistance variationBridge typeHemt circuits
The invention provides a non-ideal factor correction system for a bridge sensor, which comprises an output buffer, a linearization circuit and a temperature correction circuit, and is characterized in that the input end of the temperature correction circuit is connected with the output of a pressure sensor and an external temperature signal; the temperature correction circuit comprises an output gain amplifier, a temperature ADC, a temperature lookup table and control logic module, a gain DAC, a zero DAC and a first summation module, the output end of the temperature correction circuit is connected with the input end of the output buffer, and the output end of the output buffer is connected with the input end of the linearization circuit; according to the invention, the excitation voltage of the sensor is changed through the linearization circuit, so that good linearization is realized, the problems of large area overhead, easiness in being influenced by temperature gradient, high cost, low precision and the like in the prior art are solved, and a good temperature drift correction effect is realized by carrying out zero compensation and range correction on the output through the temperature correction circuit.
Owner:XIAN UNIV OF TECH
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