CN103475315B - Improve the device of linearity of radio-frequency power amplifier - Google Patents
Improve the device of linearity of radio-frequency power amplifier Download PDFInfo
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Abstract
The present invention discloses a kind of device that improves linearity of radio-frequency power amplifier, comprising: main power amplifier, amplifies radiofrequency signal power; Radiofrequency signal Acquisition Circuit, gathers main power amplifier radio frequency input/output signal, and adjusts the power of radio frequency output signal; Analog predistortion device, preposition at main power amplifier, produce error signal, output pre-distorted signals, to the preliminary linearisation of main power amplifier; Error signal Circuit tuning, adjusts the error signal that analog predistortion device is exported, and ensures that the error signal of output is contrary with the amplitude equal phase of main path signal; Described analog predistortion device, main power amplifier, error signal Circuit tuning head and the tail order are connected, and form error cancellation loop, offset the distortion components of main path signal; Adaptation control circuit, utilizes radio frequency input/output signal, through Digital Signal Processing, exports control signal, further optimizes the linearisation effect of feedforward system. Simplify the complexity of conventional feed forward technical pattern, not only can obtain the high linearity, and improved by Self Adaptive Control the precision that system regulates.
Description
Technical field
The present invention relates to the radio-frequency power amplifier linearization technique in wireless communication technology, be specifically related to radio-frequency power and putThe feedforward linearized technology of large device specifically, is a kind of device that improves linearity of radio-frequency power amplifier.
Background technology
Along with the development of wireless communication technology, emerge more and more advanced communication standards, as WCDMA, TD-SCDMA,WIMAX, LTE etc., adopts the much higher ZAP of the availability of frequency spectrum and complicated digital modulation mode, as 3G communicationWCDMA standard downlink transfer adopts QPSK modulation technique, and LTE adopts OFDM modulation technique. But this mode causes base band letterNumber have very wide bandwidth and very high peak-to-average force ratio, this has brought more stern challenge to design of power amplifier. In power amplifier designIn, efficiency and linearity are two key factors must considering. In the time of the signal of high peak-to-average force ratio, power amplifier need to be operated in power and returnMove back region, cause the efficiency of power amplifier greatly to reduce. In the time that power amplifier is operated in zone of saturation, efficiency has improved, but has occurred tightHeavy distortion, main manifestations is AM-AM/AM-PM distortion, causes signal spectrum expansion. Meanwhile, the increase of signal bandwidth, power amplifierMemory effect strengthen, these are all that design and the linearisation of power amplifier proposed new challenge.
Power amplifier linearization method mainly contains 4 kinds at present: rollback method, negative-feedback method, pre-distortion method and feed forward approach. Rollback method isPower amplifier is operated in to rollback district, its essence is that the efficiency of sacrifice power amplifier improves the linearity of power amplifier. Rollback method is simply and easily realExisting, but the efficiency of power amplifier obviously reduces, and also the memory effect of power amplifier cannot avoid by back-off, so necessaryPower back is combined with other linearization techniques. Negative-feedback method is a kind of appearance linearization technique early, due toThe stability that is difficult to guarantee system in radio frequency situation, does not generally directly adopt RF FEEDBACK, but adopts modulation feedback techniqueMake system works at low frequency state. Conventional modulation feedback technique has envelope negative-feedback, polar coordinates modulation negative-feedback and DescartesModulation negative-feedback. The advantage of negative-feedback method is simple in structure, and the inhibition of Intermodulation Interference is better simultaneously. But negative-feedback method isClosed-loop system, the gain of amplifier must meet enough large, and to realize high-gain and high distortion suppression, loop delay is negative simultaneouslyThe key constraints of feedback, at high band, loop delay can reach several carrier cycles, and this has just restricted the work of linearizerMake bandwidth. In addition, negative-feedback method is existence and stability problem also. So negative-feedback method is applicable to single carrier, single channel situation, be suitable forPower amplifier in mobile phone. Pre-distortion technology was simulated merit by predistorter at signal exactly before amplifying by power amplifierThe contrary characteristic of putting, whole system performance is linear like this. Pre-distortion technology can be divided into according to the difference of predistorter processing signalsAnalog predistortion and digital pre-distortion. Analog predistortion technology adopts analog circuit to realize predistorter conventionally, has the letter of realizationSingle, with low cost, unconditional stability and be easy to the advantages such as high-frequency wideband application, but spectral re-growth component is suppressed to less, lineProperty improvement is subject to the impact of duty and environment, and high-order spectrum component is offset more difficult. Digital pre-distortion technology has two kinds of realitiesExisting mode, a kind of is to realize by the parameter model of non-linear radio frequency power amplifier, another kind passes through look-up tables'implementation. Digital pre-distortionHave and realize simply, be easy to signal processing, can obtain wider bandwidth, the advantage such as linearisation is effective, but digital pre-distortionModeling need the baseband signal bandwidth of at least 5 times, the effect of predistortion and the model of power amplifier have direct relation, and numeral is in advanceThe hardware of distortion is realized also relative complex. The basic thought of feed-forward technique is that the distorted signal sample that main power amplifier is produced is anti-forwardBe fed to amplifier out, thereby the distorted signal of amplifier out is offseted greatly.
Simplification system block diagram as Fig. 1 is conventional feed forward technology. Traditional feed forward systems comprises two loops, is respectivelyFirst-harmonic is offset loop and error cancellation loop. Radio-frequency input signals is divided into two paths of signals through power splitter, and a road is through main power amplifierMPA, coupler C1, attenuator A1, phase shifter P1, coupler C2, another road is through delay line L1, coupler C2, and this two-way is believedNumber form first-harmonic and offset loop. The effect of delay line is that the two paths of signals up and down that ensures first-harmonic counteracting loop postpones to aim at. WarpThe signal process delay line of the straight-through end output of coupler C1 arrives merit and closes device, declines through the signal process of the straight-through end output of coupler C2Subtract device A2, phase shifter P2, secondary power amplifier DPA and arrive merit and close device, this two paths of signals has formed error cancellation loop. Same error counteractingThe delay line L2 of loop aims at for the delay that ensures upper and lower two paths of signals. It is defeated that first-harmonic counteracting loop is used for offsetting main power amplifier MPAThe first-harmonic composition going out, produces error signal. Error cancellation loop is mainly to error signal adjustment, ensures error signal and main meritThe signal amplitude equal phase of putting MPA output is contrary, closes device error signal feed-in main path signal like this through merit, offsets main roadThe distortion components of signal. The implementation structure complexity of conventional feed forward technology as can be seen from Figure 1, and adjustment difficulty to signalGreatly, along with the variation of condition of work and working environment, the amplitude of feedforward loop circuit and phase place can change, linearisation effect simultaneouslyCan obviously decline.
Summary of the invention
For the large shortcoming of the complicated debugging difficulty of traditional feedforward system implementation structure, consider traditional feed forward systems and depositProblem, the present invention proposes a kind of novel feedforward system. This system is introduced analog predistortion device, produces on the one hand feedforwardIn system, error signal is offset the needed error signal of loop, has simplified the complexity of conventional feed forward technology generation error signalDegree, on the other hand, analog predistortion device itself has the effect of predistortion, can be before error cancellation loop, to masterThe linearity of power amplifier makes moderate progress. For the linearisation effect having kept, this technology is introduced adaptation control circuit, by gatheringRadio frequency input/output signal, through Digital Signal Processing, self adaptation is adjusted analog predistortion device and error signal Circuit tuning, noOnly can improve the linearisation effect of feedforward system, and can improve the precision of controlling feedforward system.
Technical scheme of the present invention is:
Improve a device for linearity of radio-frequency power amplifier, this device comprises:
-main power amplifier, amplifies radiofrequency signal power;
-radiofrequency signal Acquisition Circuit, gathers main power amplifier radio frequency input/output signal, and adjusts the merit of radio frequency output signalRate;
-analog predistortion device, preposition at main power amplifier, produce error signal, output pre-distorted signals, to the preliminary line of main power amplifierProperty;
-error signal Circuit tuning, adjusts the error signal of analog predistortion device output, the error signal that ensures output withThe amplitude equal phase of main path signal is contrary;
Described analog predistortion device, main power amplifier, error signal Circuit tuning head and the tail order are connected, and form error cancellation loopRoad, offsets the distortion components of main path signal;
-adaptation control circuit, utilizes radio frequency input/output signal, and through Digital Signal Processing, output control signal, entersThe linearisation effect of one-step optimization feedforward system.
Described radiofrequency signal Acquisition Circuit, at least comprises preposition coupler (100), rearmounted coupler (700) and decayDevice (800); By radio-frequency input signals and a radio frequency output signal coupling part, as the input signal of adaptation control circuit,Adjust the radio frequency output signal power of coupling through attenuator (800); The input of preposition coupler (100) connects radio frequency input letterNumber, straight-through end connecting analog predistorter (200), coupled end connects adaptation control circuit (900); Rearmounted coupler (700)Input connect merit and close the output of device (600), straight-through end output radiofrequency signal, coupled end connects attenuator (800); DecayThe output of device (800) connects adaptation control circuit (900).
Described analog predistortion device (200), at least comprises power splitter (201), attenuator (202), delay line (203), mistakeDifference signal generation unit (204), coupler (205), vector modulator (206), merit is closed device (207); In analog predistortion devicePortion, power splitter (201) Yi road output signal arrives merit through attenuator (202), delay line (203) and closes device (207), another roadSignal arrives merit through error signal generation unit (204), coupler (205), vector modulator (206) and closes device (207); In simulationPredistortion outside, the straight-through end of the input butt coupling device (100) of power splitter (201), the output that merit is closed device (207) connectsThe input of main power amplifier (300). This analog predistortion device (200) output two paths of signals, through the coupled end output of coupler (205)Error signal, as the input signal of error signal Circuit tuning (500), closes the pre-distorted signals of device (207) output through merit, doIt is the input signal of main power amplifier (300); This analog predistortion device (200) uses vector modulator (206) to replace traditional decayThe cascading of device, phase shifter, is convenient to Self Adaptive Control.
Described error signal Circuit tuning (500), at least comprises error amplifier (501), vector modulator (502), pairPower amplifier (503); The coupled end of the input butt coupling device (205) of error amplifier (501), output connected vector modulator(502) rf inputs, the control end of vector modulator (502) connects the output of adaptation control circuit (900), outputThe input of end auxiliary connection power amplifier (503), the output connection merit of secondary power amplifier (503) is closed an input of device (600); ErrorAmplifier (501) is linear amplifier, amplifies linear small-signal error signal, is convenient to vector modulator (502) and regulates; VectorModulator (502) is according to the control signal of adaptation control circuit output, the amplitude of alignment error signal and phase place; Secondary power amplifier(503) power of error signal is brought up to necessary requirement.
Described error cancellation loop, at least comprises analog predistortion device (200), main power amplifier (300), delay line (400), mistakeDifference signal Circuit tuning (500), merit is closed device (600); In order to ensure that upper and lower two paths of signals postpones to aim at, design delay line(400), the input of delay line connects the output of main power amplifier, and output connection merit is closed an input of device (600); Merit is closedAnother input of device connects the output of error signal adjustment unit; Close device (600) error signal feed-in master by meritRoad signal, offsets the distortion components of main path signal.
Described adaptation control circuit (900), at least comprises down coversion (901), frequency overlapped-resistable filter (902), ADC(903), DSP(904), DAC(905) and, reconfigurable filter (906), Clock management (907); Two inputs of down coversion (901)Connect the output of radiofrequency signal Acquisition Circuit, output connects frequency overlapped-resistable filter (902), frequency overlapped-resistable filter (902)Output connect ADC(903) input, ADC(903) output connect DSP(904) input, DSP(904) defeatedGo out end connect DAC(905) input, DAC(905) output connect reconfigurable filter (906) input, reconstruction filteringThe control end of the output connected vector modulator (206) of device (906) and the control end of vector modulator (502), Clock management(907) output of clock connects respectively ADC(903), DSP(904), DAC(905) clock pin; Down coversion (901) is by radio frequencyThe frequency spectrum shift of signal is to intermediate-freuqncy signal; The design cut-off frequency that wave filter (906) is folded in reconstruct is DAC(905) sample rate oneHalf, complete the shaping of output signal; DSP(904) be the core of adaptation control circuit, complete all signal processing,Comprise Digital Down Convert, signal alignment, adaptive algorithm, channel equalization and IQ compensation; Clock management (907) is ADC(903), DSP(904), DAC(905) reference clock is provided.
Beneficial effect of the present invention: there are 2 points with the difference of conventional feed forward linearized system, the one, utilize analog predistortionDevice produces error signal, has simplified the complexity of conventional feed forward technology generation error signal, the own tool of analog predistortion device simultaneouslyThere is linearizing effect, can further improve the linearity of power amplifier. The 2nd, add adaptation control circuit, calculate by self adaptationThe performance of method adjustment System, has also improved the precision that system is adjusted simultaneously.
Brief description of the drawings
For clearer explanation the present invention with implement native system, below by accompanying drawing and labor introducing system eachModule.
Fig. 1 conventional feed forward linearized system
A kind of device that improves linearity of radio-frequency power amplifier of Fig. 2
Fig. 3 analog predistortion device
Fig. 4 error signal Circuit tuning
Fig. 5 adaptation control circuit
Fig. 6 DSP signal processing flow.
Detailed description of the invention
In order to make the present invention better understand and implement, will, by accompanying drawing and labor, introduce whole system mould belowThe enforcement of piece, and make a concrete analysis of the 26S Proteasome Structure and Function of modules.
Embodiment: the method and the device that improve linearity of radio-frequency power amplifier
If Fig. 2 is the installation drawing that improves linearity of radio-frequency power amplifier. This feedforward system is made up of following part: radio frequencySignal acquisition circuit, analog predistortion device, error signal Circuit tuning, main power amplifier, error cancellation loop, Self Adaptive Control electricityRoad. Radiofrequency signal Acquisition Circuit gathers radio-frequency input signals and radio frequency output signal, as the input letter of adaptation control circuitNumber. Analog predistortion device, produces the required error signal of error cancellation loop on the one hand, has simplified conventional feed forward technology and has produced mistakeThe complexity of difference signal, produces pre-distorted signals on the other hand, first to main power amplifier linearization. Error signal Circuit tuning is to errorSignal is adjusted, and makes it contrary with the amplitude equal phase of main path signal. Main power amplifier, carries out power amplification to radiofrequency signal, alsoTo treat linearizing element. Error cancellation loop, from the two paths of signals of analog predistortion device output, a road pre-distorted signals, warpCross the input that main power amplifier, delay line arrive merit and close device, form main road, another road error signal is through error signal adjustmentAnother input that circuit arrival merit is closed device, then closes device by error signal feed-in main path signal by merit, offsets main road letterDistortion component in number. Adaptation control circuit, for Self Adaptive Control analog predistortion device and error signal Circuit tuning, makesWhole feedforward system is operated in good state.
1 radiofrequency signal Acquisition Circuit
As Fig. 2, radiofrequency signal Acquisition Circuit at least comprises preposition coupler (100), rearmounted coupler (700) and attenuator(800). By radio-frequency input signals and a radio frequency output signal coupling part, as the input signal of adaptation control circuit. ExamineWorry is large to the power ratio radio-frequency input signals power of radio frequency output signal, need to pass through the radio frequency that attenuator (800) adjustment is coupledOutput signal power. The input of coupler (100) connects radio-frequency input signals, straight-through end connecting analog predistorter (200),Coupled end connects adaptation control circuit (900). The input of rearmounted coupler (700) connects merit and closes the output of device (600),Straight-through end output radiofrequency signal, coupled end connects attenuator (800). The output of attenuator connects adaptation control circuit（900）。
2 analog predistortion devices
As Fig. 3, analog predistortion device comprises power splitter (201), attenuator (202), and delay line (203), error signal is producedRaw unit (204), coupler (205), vector modulator (206), merit is closed device (207). The input of power splitter (201) connects couplingClose the straight-through end of device (100), an output connects attenuator (202), and another output connects error signal generation unit(204), the input of the output connection delay line (203) of attenuator (202), the output of delay line (203) connects merit and closesAn input of device (207), the output butt coupling device (205) of error signal generation unit (204), coupler (205)The rf inputs of straight-through end connected vector modulator (205), coupled end connects error signal Circuit tuning (500), vectorThe control end of modulator (205) connects the output of adaptation control circuit (900), and output connects merit and closes one of device (207)Individual input, the output that merit is closed device (207) connects the input of main power amplifier (300). As Fig. 3, radiofrequency signal is through power splitter(201) be divided into upper and lower two paths of signals, upward signal arrives merit through attenuator (202), delay line (203) and closes device (207), retainsThe feature of original input signal, be referred to as main road. Main road, by delay line (203), ensures to postpone to aim at downstream signal. UnderRow signal arrives merit through error signal generation unit (204), coupler (205), vector modulator (206) and closes device (207). This mouldIntend predistorter output two paths of signals,, through the error signal of the coupled end output of coupler (205), adjust as error signal on a roadThe input signal of whole circuit (500), another Lu Jinggong closes device (206) output pre-distorted signals, as the input of main power amplifier (300)Signal.
In the design of this analog predistortion device, use vector modulator to replace traditional variable attenuator and phase shifterCascading. Adopt traditional attenuator and phase shifter cascade form to have a defect, when the control of attenuator and phase shifterWhen signal intensity processed, can bring the change of group delay, have a strong impact on the performance of predistortion. The adjustment of attenuator and phase shifter simultaneouslyCan influence each other, be difficult to predistortion accurately to control. And vector modulator not only can independent control signal amplitude andPhase place, and can accept the control signal of adaptation control circuit, the performance of Self Adaptive Control analog predistortion device.
3 error signal Circuit tunings
As Fig. 3, error signal Circuit tuning comprises error amplifier (501), vector modulator (501) and secondary power amplifier(503). The coupled end of error amplifier (501) input butt coupling device (205), output connected vector modulator (502)Rf inputs, the control end of vector modulator (502) connects the output port of adaptation control circuit (900), outputThe input of auxiliary connection power amplifier (503), the output connection merit of secondary power amplifier (503) is closed an input of device (600). Error is putLarge device (501) is linear amplifier, amplifies linear small-signal error signal, is convenient to the adjustment of vector modulator (502). VectorModulator (502) is according to the control signal of adaptation control circuit (900), the amplitude of alignment error signal and phase place. Secondary power amplifierThe power of error signal is brought up to required requirement. The function of this error signal adjusting module is alignment error signal, ensuresError signal is contrary with the amplitude equal phase of the main path signal of error cancellation loop.
Here use equally vector modulator to replace traditional variable attenuator and the cascading of phase shifter, be convenient to connectBe subject to the control signal of adaptation control circuit, self adaptation alignment error signal.
4 main power amplifiers
The radio frequency output of the input connecting analog predistorter (200) of main power amplifier (300), and output connection delay line(400) input. Main power amplifier (300) is the main element of feedforward system, is also to treat linearizing element. In order to improve power amplifierEfficiency, main power amplifier (300) works in saturation region, certainly leads to distortion component.
5 error cancellation loop
Error cancellation loop, by analog predistortion device (200), main power amplifier (300), delay line (400), error signal adjustmentCircuit (500), merit is closed device (600) and is formed. The output that the middle merit of analog predistortion device (200) is closed device (207) connects main power amplifier(300) input, the coupled end connection error signal Circuit tuning (500) of coupler in analog predistortion device (205)Input, the input of the output connection delay line (400) of main power amplifier (300), the output of delay line (400) connects merit and closesAn input of device (600), the output connection merit of error Circuit tuning (500) is closed another input of device, and merit is closed device(600) input of output butt coupling device (700).
Arrive merit from the pre-distorted signals of analog predistortion device (200) output through main power amplifier (300), delay line (400)Close an input of device (600), form main road. From the error signal process error signal of analog predistortion device (200) outputCircuit tuning (500), closes device (600) feed-in main path signal by merit, offsets the distortion component of main path signal. Upper and lower in order to ensureTwo paths of signals postpones to aim at, and has designed delay line (400).
6 adaptation control circuits
Feed-forward amplifier is subject to the impact of amplitude, phase place and delay very responsive on the inhibition of distorted signal. Power is putThe power gain of large device changes with the variation of environment temperature and carrier frequency. And feedforward system requires the width of two paths of signalsDegree, phase place and delay are mated the distortion component in main path signal could be offset completely completely, and the susceptibility of system is very high. SoNeed to carry out Self Adaptive Control to feedforward system, update the system parameter has with the output signal of guaranteed output amplifier in real timeThe good linearity.
As Fig. 5, adaptation control circuit (900), comprises down coversion (901), frequency overlapped-resistable filter (902), ADC(903),DSP(904), DAC(905), reconfigurable filter (906), Clock management (907). Two inputs of down coversion (901) connect to be penetratedFrequently the output of signal acquisition circuit, output connects frequency overlapped-resistable filter (902), the output of frequency overlapped-resistable filter (902)Connect ADC(903) input, ADC(903) output connect DSP(904) input, DSP(904) output connectMeet DAC(905) input, DAC(905) output connect reconfigurable filter (906) input, reconfigurable filter(906) control end of output connected vector modulator (205) and the control end of vector modulator (502), Clock management(907) output of clock connects respectively ADC(903), DSP(904), DAC(905) clock pin.
The frequency spectrum shift of radiofrequency signal is arrived intermediate-freuqncy signal by down coversion (901). Radiofrequency signal there will be and permitted through down coversionMany other frequency contents, filtering unwanted frequency composition, is convenient to ADC(903 on the other hand on the one hand) sampling meets low pass sampling, underCascade frequency overlapped-resistable filter (902) after frequency conversion. The cut-off frequency of frequency overlapped-resistable filter (902) will meet wanting of low pass samplingAsk, in band, gain flatness will meet certain requirement simultaneously, and phase place meets linear phase. ADC(903) device and DAC(905)Part is chosen and need be considered bit wide, sample rate and cost. The centre frequency of the intermediate-freuqncy signal of this feedforward system is generally on a 30MHz left sideSample rate is improved in the right side under the requirement that meets low pass sampling as far as possible, can choose sample rate here and be the 5-7 of intermediate frequency doubly, i.e. ADC(903) sample rate and DAC(905) is at least 150MSPS. Consider operational precision, quantizing noise and cost, can choose hereBit wide is the device of 12bit at least. For the ease of controlling two paths of signals, meet data synchronous simultaneously, choose twin-channel device. HeavyThe design that structure is folded wave filter (906) equally first needs to meet the requirement that low pass is sampled, and cut-off frequency is generally designed to DAC(905) half of sample rate. Through control signal and the difference control simulation predistorter (200) of reconfigurable filter (906) outputWith error signal adjustment unit.
DSP(904) be the core of adaptation control circuit, complete all signal processing. First DSP adopts ADCThe intermediate-freuqncy signal of sample, through Digital Down Convert, is converted into digital baseband signal. Because input data are asynchronous with output data, needTo aim at data delay by the method such as relevant. Through the inputoutput data of alignment, according to adaptive algorithm, settling signalProcessing, output control signal. Due to unsatisfactory in vector modulator reality, IQ data be not 90 ° orthogonal, so needIn DSP, compensate IQ imbalance. Because signal will be through DAC, reconfigurable filter and some analog lines, certainly lead to linear mistakeVery, so need to carry out channel equalization to delivery channel. Can obtain the concrete signal processing flow of DSP as Fig. 6 by analyzing.
Above-described embodiment understands and improves the device of linearity of radio-frequency power amplifier specifically, labor this systemDesign and feature, for general technical staff of the technical field of the invention, the present invention can have various changes and changeChange. Within the spirit and principles in the present invention all, any amendment of doing, equivalent replacement, improvement etc., all should be included in the present inventionProtection domain within.
Claims (6)
1. improve a device for linearity of radio-frequency power amplifier, this device comprises:
-main power amplifier, amplifies radiofrequency signal power;
-radiofrequency signal Acquisition Circuit, gathers main power amplifier radio frequency input/output signal, and adjusts the power of radio frequency output signal;
-analog predistortion device, preposition at main power amplifier, produce error signal, output pre-distorted signals, tentatively linear to main power amplifierChange;
-error signal Circuit tuning, adjusts the error signal that analog predistortion device is exported, and ensures error signal and the main road of outputThe amplitude equal phase of signal is contrary;
Described analog predistortion device, main power amplifier, error signal Circuit tuning head and the tail order are connected, and form error cancellation loop, supportThe distortion components of main path signal disappears;
-adaptation control circuit, utilizes radio frequency input/output signal, through Digital Signal Processing, and output control signal, furtherOptimize the linearisation effect of feedforward system.
2. the device that improves linearity of radio-frequency power amplifier as claimed in claim 1, is characterized in that, described radio frequency letterNumber Acquisition Circuit, at least comprises preposition coupler (100), rearmounted coupler (700) and attenuator (800); By radio frequency input letterNumber and a radio frequency output signal coupling part, as the input signal of adaptation control circuit, adjust coupling through attenuator (800)Radio frequency output signal power; The input of preposition coupler (100) connects radio-frequency input signals, and straight-through end connecting analog loses in advanceTrue device (200), coupled end connects adaptation control circuit (900); The input of rearmounted coupler (700) connects merit and closes device(600) output, straight-through end output radiofrequency signal, coupled end connects attenuator (800); The output of attenuator (800) connectsConnect adaptation control circuit (900).
3. the device that improves linearity of radio-frequency power amplifier as claimed in claim 1, is characterized in that, described simulation is lost in advanceTrue device (200), at least comprises power splitter (201), attenuator (202), and delay line (203), error signal generation unit (204),Coupler (205), vector modulator (206), merit is closed device (207); In analog predistortion device inside, power splitter (201) Yi roadOutput signal arrives merit through attenuator (202), delay line (203) and closes device (207), and another road signal produces single through error signalUnit (204), coupler (205), vector modulator (206) arrive merit and close device (207); At analog predistortion outside, power splitter(201) the straight-through end of input butt coupling device (100), the output that merit is closed device (207) connects the input of main power amplifier (300)End;
This analog predistortion device (200) output two paths of signals, through the coupled end output error signal of coupler (205), as mistakeThe input signal of difference signal Circuit tuning (500), closes the pre-distorted signals of device (207) output through merit, as main power amplifier (300)Input signal; This analog predistortion device (200) uses vector modulator (206) to replace traditional attenuator, the cascade of phase shifterCombination, is convenient to Self Adaptive Control.
4. the device that improves linearity of radio-frequency power amplifier as claimed in claim 1, is characterized in that, described error signalCircuit tuning (500), at least comprises error amplifier (501), vector modulator (502), secondary power amplifier (503); Error amplifier(501) coupled end of input butt coupling device (205), the rf inputs of output connected vector modulator (502), vowsThe control end of amount modulator (502) connects the output of adaptation control circuit (900), output auxiliary connection power amplifier (503)Input, the output connection merit of secondary power amplifier (503) is closed an input of device (600); Error amplifier (501) is that linearity is putLarge device, amplifies linear small-signal error signal, is convenient to vector modulator (502) and regulates; Vector modulator (502) is according to adaptiveAnswer the control signal of control circuit output, the amplitude of alignment error signal and phase place; Secondary power amplifier (503) is by the power of error signalBring up to necessary requirement.
5. the device that improves linearity of radio-frequency power amplifier as claimed in claim 1, is characterized in that, described error counteractingLoop, at least comprises analog predistortion device (200), main power amplifier (300), and delay line (400), error signal Circuit tuning (500),Merit is closed device (600); In order to ensure that upper and lower two paths of signals postpones to aim at, design delay line (400), the input of delay line connectsThe output of main power amplifier, output connection merit is closed an input of device (600); Another input that merit is closed device connects errorThe output of signal adjustment unit; Close device (600) error signal feed-in main path signal by merit, offset the distortion of main path signalComposition.
6. the device that improves linearity of radio-frequency power amplifier as claimed in claim 1, is characterized in that, described self-adaptive controlledCircuit processed (900), at least comprises down coversion (901), frequency overlapped-resistable filter (902), ADC(903), DSP(904), DAC(905),Reconfigurable filter (906), Clock management (907); Two inputs of down coversion (901) connect the defeated of radiofrequency signal Acquisition CircuitGo out end, output connects frequency overlapped-resistable filter (902), and the output of frequency overlapped-resistable filter (902) connects ADC(903) inputEnd, ADC(903) output connect DSP(904) input, DSP(904) output connect DAC(905) input,DAC(905) output connects the input of reconfigurable filter (906), and the output connected vector of reconfigurable filter (906) is adjustedThe control end of the control end of device processed (206) and vector modulator (502), the clock output of Clock management (907) connects respectively ADC(903), DSP(904), DAC(905) clock pin; The frequency spectrum shift of radiofrequency signal is arrived intermediate-freuqncy signal by down coversion (901);The design cut-off frequency that wave filter (906) is folded in reconstruct is DAC(905) half of sample rate, complete the shaping of output signal; DSP(904) be the core of adaptation control circuit, complete all signal processing, comprise Digital Down Convert, signal alignment, fromAdaptive algorithm, channel equalization and IQ compensation; Clock management (907) is ADC(903), DSP(904), DAC(905) reference is providedClock.
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| CN107579716B (en) * | 2017-09-19 | 2020-08-07 | 中国人民解放军海军工程大学 | Linear power amplifier based on analog cancellation |
| CN107707211A (en) * | 2017-09-27 | 2018-02-16 | 上海联影医疗科技有限公司 | A kind of power amplifier compensation method, device and system |
| US11038474B2 (en) * | 2017-11-01 | 2021-06-15 | Analog Devices Global Unlimited Company | Phased array amplifier linearization |
| TWI696344B (en) * | 2018-11-16 | 2020-06-11 | 財團法人工業技術研究院 | Linearity improving system and linearity improving method |
| CN110865256B (en) * | 2019-11-26 | 2021-08-24 | 四川九立微波有限公司 | Radio frequency amplitude modulator for realizing linearity through common electrically-controlled attenuator |
| CN111900943B (en) * | 2020-07-14 | 2023-05-05 | 电子科技大学 | Radio frequency broadband high-efficiency rectifier |
| CN113131873B (en) * | 2021-03-12 | 2024-03-19 | 南京国微电子有限公司 | Self-adaptive feedforward linearization power amplifier device |
| CN113162559B (en) * | 2021-03-30 | 2022-07-29 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Millimeter wave self-adaptive predistortion linearized solid-state power amplifier |
| CN114285381B (en) * | 2021-12-20 | 2024-02-09 | 电子科技大学 | Dual-channel broadband linearizer based on common source structure |
| CN117833831A (en) * | 2022-09-29 | 2024-04-05 | 中兴通讯股份有限公司 | Power amplifier |
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