CN103475315A - Method and device for improving linearity of radio frequency power amplifier - Google Patents
Method and device for improving linearity of radio frequency power amplifier Download PDFInfo
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Abstract
The invention discloses a method and a device for improving linearity degrees of a radio frequency power amplifier. The method for improving the linearity degrees of the radio frequency power amplifier comprises (1) collecting frequency input and output signals and adjusting power of frequency output signals; (2) generating error signals by applying a simulation predistortion method, outputting predistortion signals and performing primary linearization on a main power amplifier; (3) adjusting the error signals of simulation predistortion and guaranteeing that amplitudes of output error signals and main route signals are identical and phase positions are opposite; (4) applying an error offset method to offset distorsion ingredients of the main route signals; (5) outputting control signals by applying a self-adaptive control method and data signal processing and through the frequency input and output signals and further optimizing linearization effects of a feed forward system. The method for improving the linearity degrees of the radio frequency power amplifier has the advantages of simplifying complexity of the traditional feed forward technology structure, enabling high linearity degrees to be obtained and improving the system control accuracy through self-adaptive control.
Description
Technical field
The present invention relates to the radio-frequency power amplifier linearization technique in wireless communication technology, be specifically related to the feedforward linearized technology of radio-frequency power amplifier, specifically, is a kind of method and device that improves linearity of radio-frequency power amplifier.
Background technology
Development along with wireless communication technology, emerge more and more advanced communication standards, as WCDMA, TD-SCDMA, WIMAX, LTE etc., adopt the much higher ZAP of the availability of frequency spectrum and complicated digital modulation mode, as the WCDMA standard downlink transfer employing QPSK modulation technique of 3G communication, LTE adopts the OFDM modulation technique.But this mode causes baseband signal to have very wide bandwidth and very high peak-to-average force ratio, this has brought more stern challenge to the design of power amplifier.In power amplifier design, efficiency and linearity are two key factors must considering.When the signal of high peak-to-average force ratio, power amplifier need to be operated in the back-off zone, causes the efficiency of power amplifier greatly to reduce.When power amplifier is operated in zone of saturation, efficiency has improved, but serious distortion occurred, and main manifestations is the AM-AM/AM-PM distortion, causes the signal spectrum expansion.Simultaneously, the increase of signal bandwidth, the memory effect of power amplifier strengthens, and 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.The rollback method is that power amplifier is operated in to the rollback district, its essence is that the efficiency of sacrificing power amplifier improves the linearity of power amplifier.The rollback method is simple and easily realize, but the efficiency of power amplifier obviously reduces, and the memory effect of power amplifier can't avoid by back-off, so must be combined with Power back with other linearization techniques.The negative feedback method is a kind of appearance linearization technique early, owing to being difficult to the stability of assurance system in the radio frequency situation, does not generally directly adopt radio-frequency (RF) FEEDBACK, but adopts the modulation feedback technique to make system works at the low frequency state.Modulation feedback technique commonly used has the envelope negative feedback, and polar coordinates modulation negative feedback and Descartes modulate negative feedback.The advantage of negative feedback method is simple in structure, and the inhibition of Intermodulation Interference is better simultaneously.But the negative feedback method is closed-loop system, the gain of amplifier must meet enough large, to realize high-gain and high distortion suppression, loop delay is degenerative key constraints simultaneously, at high band, loop delay can reach several carrier cycles, and this has just restricted the bandwidth of operation of linearizer.In addition, negative feedback method is the existence and stability problem also.So the negative feedback method is applicable to single carrier, single channel situation, is applicable to the power amplifier in mobile phone.Pre-distortion technology passed through the contrary characteristic of predistorter analog amplifier exactly before being amplified by power amplifier at signal, the whole system performance is linear like this.Pre-distortion technology can be divided into to analog predistortion and digital pre-distortion according to the difference of predistorter processing signals.Analog predistortion technology adopts analog circuit to realize predistorter usually, have and realize simple, with low cost, unconditional stability and be easy to the advantages such as high-frequency wideband application, but the spectral re-growth component is suppressed to less, linear improvement is subject to the impact of operating state and environment, and the high-order spectrum component is offset more difficult.Digital pre-distortion technology has two kinds of implementations, and a kind of is to realize by the parameter model of non-linear radio frequency power amplifier, and another kind passes through look-up tables'implementation.Digital pre-distortion has to be realized simply, being easy to signal processes, can obtain wider bandwidth, the advantages such as linearisation is effective, but the modeling of digital pre-distortion needs the baseband signal bandwidth of at least 5 times, the effect of predistortion and the model of power amplifier have direct relation, and the hardware of digital pre-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 feeds back to forward amplifier out, thereby makes the distorted signal of amplifier out be offseted greatly.
Simplification system block diagram as Fig. 1 is the conventional feed forward technology.Traditional feed forward systems comprises two loops, is respectively first-harmonic and offsets 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 amplifier MPA, coupler C1, attenuator A1, phase shifter P1, coupler C2, and another road is through delay line L1, coupler C2, and this two paths of signals has formed first-harmonic and offset loop.The effect of delay line is that the two paths of signals up and down that guarantees first-harmonic counteracting loop postpones to aim at.Signal process delay line arrival merit through the straight-through end output of coupler C1 is closed device, through signal process attenuator A2, phase shifter P2, the secondary power amplifier DPA arrival merit of the straight-through end output of coupler C2, closes device, and this two paths of signals has formed error cancellation loop.The delay line L2 of same error cancellation loop aims at for the delay that guarantees upper and lower two paths of signals.First-harmonic is offset loop for offsetting the first-harmonic composition of main power amplifier MPA output, produces error signal.Error cancellation loop is mainly to the error signal adjustment, guarantees that error signal is contrary with the signal amplitude equal phase of main power amplifier MPA output, closes device error signal feed-in main path signal through merit like this, offsets the distortion components of main path signal.The implementation structure complexity of conventional feed forward technology as can be seen from Figure 1, and large to the adjustment difficulty of signal, along with the variation of condition of work and operational environment, the amplitude of feedforward loop circuit and phase place can change simultaneously, and the linearisation effect can obviously descend.
Summary of the invention
For the large shortcoming of the complicated debugging difficulty of traditional feedforward system implementation structure, consider the problem that traditional feed forward systems exists, the present invention proposes a kind of novel feedforward system.This system is introduced the analog predistortion device, produce on the one hand error signal in feedforward system and offset the needed error signal of loop, simplified the complexity of conventional feed forward technology generation error signal, on the other hand, the analog predistortion device itself has the effect of predistortion, can, before error cancellation loop, the linearity of main power amplifier be made moderate progress.For the linearisation effect kept, this technology is introduced adaptation control circuit, by gathering the radio frequency input/output signal, through Digital Signal Processing, self adaptation is adjusted analog predistortion device and error signal Circuit tuning, not only can improve the linearisation effect of feedforward system, and can improve the precision of controlling feedforward system.
Technical scheme of the present invention is:
A kind of method of improving linearity of radio-frequency power amplifier, described radio-frequency power amplifier has main power amplifier, improves the linearity of this main power amplifier by feed forward approach, and step is:
1) gather the radio frequency input/output signal, and adjust the power of radio frequency output signal;
2) use the analog predistortion method, produce error signal, the output pre-distorted signals, and to the preliminary linearisation of main power amplifier;
3) adjust the error signal of analog predistortion, guarantee that the error signal of output equates and single spin-echo with the amplitude of main path signal;
4) use error compensation method, offset the distortion components of main path signal;
5) use self-adaptation control method, utilize the radio frequency input/output signal, through Digital Signal Processing, export control signal, further optimize the linearisation effect of feedforward system.
A kind of device that improves linearity of radio-frequency power amplifier, this device comprises:
-radiofrequency signal Acquisition Circuit, gather the radio frequency input/output signal, and adjust the power of radio frequency output signal;
-analog predistortion device, produce error signal, the output pre-distorted signals, and to the preliminary linearisation of main power amplifier;
-error signal Circuit tuning, adjust the error signal that the analog predistortion device is exported, and guarantees that the error signal of output is contrary with the amplitude equal phase of main path signal;
-error cancellation loop, closed device and formed by analog predistortion device, main power amplifier, delay line, error signal Circuit tuning, merit, offsets the distortion components of main path signal;
-adaptation control circuit, utilize the radio frequency input/output signal, through Digital Signal Processing, exports control signal, further optimizes the linearisation effect of feedforward system.
Described radiofrequency signal Acquisition Circuit, at least comprise coupler (100), 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, adjust the radio frequency output signal power of coupling through attenuator (800); The input of coupler (100) connects radio-frequency input signals, straight-through end connecting analog predistorter (200), and coupled end connects adaptation control circuit (900); The input of coupler (700) connects merit and closes the output of device (600), straight-through end output radiofrequency signal, and coupled end connects attenuator (800); The output of attenuator (800) connects adaptation control circuit (900).
Described analog predistortion device (200), at least comprise 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, one tunnel output signal of power splitter (201) arrives merit through attenuator (202), delay line (203) and closes device (207), and another road signal arrives merit through error signal generation unit (204), coupler (205), vector modulator (206) and closes device (207); In the analog predistortion outside, the straight-through end of the input butt coupling device (100) of power splitter (201), the output that merit is closed device (207) connects the input of main power amplifier (300).This analog predistortion device (200) output two paths of signals, coupled end output error signal through coupler (205), as the input signal of error signal Circuit tuning (500), close the pre-distorted signals of device (207) output through merit, as the input signal of main power amplifier (300); This analog predistortion device (200) uses vector modulator (206) to replace traditional attenuator, the cascading of phase shifter, is convenient to adaptive control.
Described error signal Circuit tuning (500), at least comprise error amplifier (501), vector modulator (502), secondary power amplifier (503); The coupled end of the input butt coupling device (205) of error amplifier (501), the rf inputs of output connected vector modulator (502), the control end of vector modulator (502) connects the output of adaptation control circuit (900), the input of output auxiliary connection power amplifier (503), the output of secondary power amplifier (503) connects the input that merit is closed device (600); Error amplifier (501) is linear amplifier, the linear amplification of small-signal error signal, is convenient to vector modulator (502) and regulates; Vector modulator (502) is according to the output control signal of adaptation control circuit, the amplitude of alignment error signal and phase place; Secondary power amplifier (503) is brought up to necessary requirement by the power of error signal.
Described error cancellation loop, at least comprise 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 guarantee that upper and lower two paths of signals postpones to aim at, designed delay line (400), the input of delay line connects the output of main power amplifier, and output connects the input that merit is closed device (600); Merit is closed the output of another input connection error signal Circuit tuning (500) of device; Close device (600) by merit error signal is fed into to main path signal, offset the distortion components of main path signal.
Described adaptation control circuit (900), at least comprise down-conversion (901), frequency overlapped-resistable filter (902), ADC(903), DSP(904), DAC(905), reconfigurable filter (906), Clock management (907), two inputs of down-conversion (901) connect the output of radiofrequency signal Acquisition Circuit, output connects frequency overlapped-resistable filter (902), the output connection ADC(903 of frequency overlapped-resistable filter (902)) input, ADC(903) input output connection DSP(904), DSP(904) input output connection DAC(905), DAC(905) output connects the input of reconfigurable filter (906), the control end of the output connected vector modulator (205) of reconfigurable filter (906) and the control end of vector modulator (502), the clock output of Clock management (907) connects respectively ADC(903), DSP(904), DAC(905) clock pin, lower frequency changer circuit (901) arrives intermediate-freuqncy signal by the frequency spectrum shift of radiofrequency signal.The design of frequency overlapped-resistable filter (902) will meet the requirement of low pass sampling; ADC(903) and device DAC(905) choose requirement that need to consider bit wide and sampling; The design cut-off frequency that 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 signals and process, 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, must there is higher clock stability.
Beneficial effect of the present invention: 2 points are arranged with the difference of conventional feed forward linearized system, the one, utilize the analog predistortion device to produce error signal, simplified the complexity of conventional feed forward technology generation error signal, analog predistortion device itself has linearizing effect simultaneously, can further improve the linearity of power amplifier.The 2nd, add adaptation control circuit, by the performance of adaptive algorithm adjustment System, also improved the precision that system is adjusted simultaneously.
The accompanying drawing explanation
For clearer explanation the present invention and enforcement native system, below by accompanying drawing and labor introducing system modules.
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.
Embodiment
In order to make the present invention better understand and implement, below will introduce the enforcement of whole system module by accompanying drawing and labor, and the 26S Proteasome Structure and Function of concrete analysis modules.
Embodiment: the method and the device that improve linearity of radio-frequency power amplifier
As Fig. 2 is the installation drawing that improves linearity of radio-frequency power amplifier.This feedforward system consists of following part: radiofrequency signal Acquisition Circuit, analog predistortion device, error signal Circuit tuning, main power amplifier, error cancellation loop, adaptation control circuit.The radiofrequency signal Acquisition Circuit gathers radio-frequency input signals and radio frequency output signal, as the input signal of adaptation control circuit.The analog predistortion device, produce the required error signal of error cancellation loop on the one hand, simplified the complexity of conventional feed forward technology generation error signal, produces on the other hand pre-distorted signals, first to main power amplifier linearization.The error signal Circuit tuning, to the error signal adjustment, makes its amplitude equal phase with main path signal contrary.Main power amplifier, carry out power amplification to radiofrequency signal, is also to treat linearizing element.Error cancellation loop, two paths of signals from the output of analog predistortion device, one road pre-distorted signals, arrive through main power amplifier, delay line the input that merit is closed device, form main road, another road error signal arrives through the error signal Circuit tuning another input that merit is closed device, then by merit, closes device by error signal feed-in main path signal, offsets the distortion component in main path signal.Adaptation control circuit, for adaptive control analog predistortion device and error signal Circuit tuning, makes whole feedforward system be operated in good state.
1 radiofrequency signal Acquisition Circuit
As Fig. 2, the radiofrequency signal Acquisition Circuit at least comprises coupler (100), 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.The power ratio radio-frequency input signals power of considering the radio frequency output signal is large, needs to adjust through attenuator (800) the radio frequency output signal power of coupling.The input of coupler (100) connects radio-frequency input signals, straight-through end connecting analog predistorter (200), and coupled end connects adaptation control circuit (900).The input of coupler (700) connects merit and closes the output of device (600), straight-through end output radiofrequency signal, and coupled end connects attenuator (800).The output of attenuator connects adaptation control circuit (900).
2 analog predistortion devices
As Fig. 3, the analog predistortion device 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).The straight-through end of the input butt coupling device (100) of power splitter (201), an output connects attenuator (202), 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 the input that merit is closed device (207), the output butt coupling device (205) of error signal generation unit (204), the rf inputs of the straight-through end connected vector modulator (205) of coupler (205), coupled end connects error signal Circuit tuning (500), the control end of vector modulator (205) connects the output of adaptation control circuit (900), output connects the input that merit is closed device (207), the output that merit is closed device (207) connects the input of main power amplifier (300).As Fig. 3, radiofrequency signal is divided into upper and lower two paths of signals through power splitter (201), and upward signal arrives merit through attenuator (202), delay line (203) and closes device (207), has retained the feature of original input signal, is referred to as main road.Main road, by delay line (203), guarantees to postpone to aim at downstream signal.Downstream signal arrives merit through error signal generation unit (204), coupler (205), vector modulator (206) and closes device (207).This analog predistortion device output two paths of signals, one tunnel is through the error signal of the coupled end output of coupler (205), as the input signal of error signal Circuit tuning (500), another Lu Jinggong closes device (206) output pre-distorted signals, as the input signal of main power amplifier (300).
In the design of this analog predistortion device, use vector modulator to replace traditional variable attenuator and the cascading of phase shifter.Adopt traditional attenuator and phase shifter cascade form to have a defect, when the control signal of attenuator and phase shifter changes, the change that can bring group delay, have a strong impact on the performance of predistortion.The adjustment of attenuator and phase shifter simultaneously can influence each other, and is difficult to predistortion is accurately controlled.And vector modulator not only can independent control signal amplitude and phase place, and can accept the control signal of adaptation control circuit, the performance of adaptive control analog predistortion device.
3 error signal Circuit tunings
As Fig. 3, the 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), the rf inputs of output connected vector modulator (502), the control end of vector modulator (502) connects the output port of adaptation control circuit (900), the input of output auxiliary connection power amplifier (503), the output of secondary power amplifier (503) connects the input that merit is closed device (600).Error amplifier (501) is linear amplifier, the linear amplification of small-signal error signal, is convenient to the adjustment of vector modulator (502).Vector modulator (502) is according to the control signal of adaptation control circuit (900), the amplitude of alignment error signal and phase place.Secondary power amplifier is brought up to required requirement to the power of error signal.The function of this error signal adjusting module is the alignment error signal, guarantees that error 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 accept 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 the input of output connection delay line (400).Main power amplifier (300) is the main element of feedforward system, is also to treat linearizing element.In order to improve the efficiency of power amplifier, 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 Circuit tuning (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 the input of main power amplifier (300), the coupled end of coupler in the analog predistortion device (205) connect error signal Circuit tuning (500) input, the input of the output connection delay line (400) of main power amplifier (300), the output of delay line (400) connects the input that merit is closed device (600), the output of error Circuit tuning (500) connects another input that merit is closed device, and merit is closed the input of the output butt coupling device (700) of device (600).
Arrive through main power amplifier (300), delay line (400) input that merit is closed device (600) from the pre-distorted signals of analog predistortion device (200) output, form main road.Error signal process error signal Circuit tuning (500) from analog predistortion device (200) output, close device (600) feed-in main path signal by merit, offsets the distortion component of main path signal.In order to guarantee that upper and lower two paths of signals postpones to aim at, 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.The power gain of power amplifier changes with the variation of ambient temperature and carrier frequency.And feedforward system requires amplitude, phase place and the delay of two paths of signals to mate the distortion component in main path signal could be offset fully fully, the susceptibility of system is very high.So need to carry out adaptive control to feedforward system, the update the system parameter has the good linearity with the output signal of guaranteed output amplifier in real time.
As Fig. 5, adaptation control circuit (900), comprise down-conversion (901), frequency overlapped-resistable filter (902), ADC(903), DSP(904), DAC(905), reconfigurable filter (906), Clock management (907).Two inputs of down-conversion (901) connect the output of radiofrequency signal Acquisition Circuit, output connects frequency overlapped-resistable filter (902), the output connection ADC(903 of frequency overlapped-resistable filter (902)) input, ADC(903) input output connection DSP(904), DSP(904) input output connection DAC(905), DAC(905) output connects the input of reconfigurable filter (906), the control end of the output connected vector modulator (205) of reconfigurable filter (906) and the control end of vector modulator (502), the clock output of Clock management (907) connects respectively ADC(903), DSP(904), DAC(905) clock pin.
Lower frequency changer circuit (901) arrives intermediate-freuqncy signal by the frequency spectrum shift of radiofrequency signal.Radiofrequency signal there will be many other frequency contents through down-conversion, and filtering unwanted frequency composition, be convenient to ADC(903 on the other hand on the one hand) sampling meets low pass sampling, cascade frequency overlapped-resistable filter (902) after down-conversion.The cut-off frequency of frequency overlapped-resistable filter (902) will meet the requirement of low pass sampling, and in the band, gain flatness will meet certain requirement simultaneously, and phase place meets linear phase.ADC(903) and device DAC(905) choose and need consider bit wide, sample rate and cost.The centre frequency of the intermediate-freuqncy signal of this feedforward system is generally in the 30MHz left and right, improve sample rate under the requirement that meets the low pass sampling as far as possible, here can choose sample rate and be the 5-7 of intermediate frequency doubly, i.e. ADC(903) and sample rate DAC(905) be at least 150MSPS.Consider operational precision, quantizing noise and cost, can choose at least device of 12bit of bit wide here.For the ease of controlling two paths of signals, meet data synchronous simultaneously, choose twin-channel device.Equally at first the design that filter (906) is folded in reconstruct needs to meet the requirement of low pass sampling, and cut-off frequency generally is designed to DAC(905) half of sample rate.Control signal and difference control simulation predistorter (200) and error signal adjustment unit through reconfigurable filter (906) output.
DSP(904) be the core of adaptation control circuit, complete all signals and process.At first DSP the intermediate-freuqncy signal process Digital Down Convert of ADC sampling, is converted into digital baseband signal.Asynchronous with the output data due to the input data, need by the method such as relevant, data to be postponed to aim at.Through the inputoutput data of alignment, according to adaptive algorithm, the processing of settling signal, output control signal.Due to unsatisfactory in vector modulator reality, the IQ data are not 90 ° of quadratures, so need in DSP, compensate the IQ imbalance.Because signal will certainly lead to linear distortion through DAC, reconfigurable filter and some analog lines, 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 the device improve linearity of radio-frequency power amplifier specifically, labor design and the characteristics of this system, for the general technical staff of the technical field of the invention, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, equivalence replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a method of improving linearity of radio-frequency power amplifier, described radio-frequency power amplifier has main power amplifier, uses feed forward approach based on analog predistortion to improve the linearity of this main power amplifier, and step is:
1) gather the radio frequency input/output signal, and adjust the power of radio frequency output signal;
2) use the analog predistortion method, produce error signal, the output pre-distorted signals, and to the preliminary linearisation of main power amplifier;
3) adjust the error signal of analog predistortion, guarantee that the error signal of output equates and single spin-echo with the amplitude of main path signal;
4) use error compensation method, offset the distortion components of main path signal;
5) use self-adaptation control method, utilize the radio frequency input/output signal, through Digital Signal Processing, export control signal, further optimize the linearisation effect of feedforward system.
2. a device that improves linearity of radio-frequency power amplifier, this device comprises:
-radiofrequency signal Acquisition Circuit, gather the radio frequency input/output signal, and adjust the power of radio frequency output signal;
-analog predistortion device, produce error signal, the output pre-distorted signals, and to the preliminary linearisation of main power amplifier;
-error signal Circuit tuning, adjust the error signal that the analog predistortion device is exported, and guarantees that the error signal of output is contrary with the amplitude equal phase of main path signal;
-error cancellation loop, closed device and formed by analog predistortion device, main power amplifier, delay line, error signal Circuit tuning, merit, offsets the distortion components of main path signal;
-adaptation control circuit, utilize the radio frequency input/output signal, through Digital Signal Processing, exports control signal, further optimizes the linearisation effect of feedforward system.
3. the device that improves linearity of radio-frequency power amplifier as claimed in claim 2, is characterized in that, described radiofrequency signal Acquisition Circuit at least comprises coupler (100), 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, adjust the radio frequency output signal power of coupling through attenuator (800); The input of coupler (100) connects radio-frequency input signals, straight-through end connecting analog predistorter (200), and coupled end connects adaptation control circuit (900); The input of coupler (700) connects merit and closes the output of device (600), straight-through end output radiofrequency signal, and coupled end connects attenuator (800); The output of attenuator (800) connects adaptation control circuit (900).
4. the device that improves linearity of radio-frequency power amplifier as claimed in claim 2, it is characterized in that, described analog predistortion device (200), at least comprise power splitter (201), attenuator (202), delay line (203), error signal generation unit (204), coupler (205), vector modulator (206), merit is closed device (207); In analog predistortion device inside, one tunnel output signal of power splitter (201) arrives merit through attenuator (202), delay line (203) and closes device (207), and another road signal arrives merit through error signal generation unit (204), coupler (205), vector modulator (206) and closes device (207); In the analog predistortion outside, the straight-through end of the input butt coupling device (100) of power splitter (201), the output that merit is closed device (207) connects the input of main power amplifier (300); This analog predistortion device (200) output two paths of signals, coupled end output error signal through coupler (205), as the input signal of error signal Circuit tuning (500), close the pre-distorted signals of device (207) output through merit, as the input signal of main power amplifier (300); This analog predistortion device (200) uses vector modulator (206) to replace traditional attenuator, the cascading of phase shifter, is convenient to adaptive control.
5. the device that improves linearity of radio-frequency power amplifier as claimed in claim 2, is characterized in that, described error signal Circuit tuning (500) at least comprises error amplifier (501), vector modulator (502), secondary power amplifier (503); The coupled end of the input butt coupling device (205) of error amplifier (501), the rf inputs of output connected vector modulator (502), the control end of vector modulator (502) connects the output of adaptation control circuit (900), the input of output auxiliary connection power amplifier (503), the output of secondary power amplifier (503) connects the input that merit is closed device (600); Error amplifier (501) is linear amplifier, the linear amplification of small-signal error signal, is convenient to vector modulator (502) and regulates; Vector modulator (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) is brought up to necessary requirement by the power of error signal.
6. the device that improves linearity of radio-frequency power amplifier as claimed in claim 2, is characterized in that, described error cancellation loop, at least comprise analog predistortion device (200), main power amplifier (300), delay line (400), error signal Circuit tuning (500), merit is closed device (600); In order to guarantee that upper and lower two paths of signals postpones to aim at, designed delay line (400), the input of delay line connects the output of main power amplifier, and output connects the input that merit is closed device (600); Merit is closed the output of another input connection error signal adjustment unit of device; Close device (600) error signal feed-in main path signal by merit, offset the distortion components of main path signal.
7. the device that improves linearity of radio-frequency power amplifier as claimed in claim 2, it is characterized in that, described adaptation control circuit (900), at least comprise down-conversion (901), frequency overlapped-resistable filter (902), ADC(903), DSP(904), DAC(905), reconfigurable filter (906), Clock management (907), two inputs of down-conversion (901) connect the output of radiofrequency signal Acquisition Circuit, output connects frequency overlapped-resistable filter (902), the output connection ADC(903 of frequency overlapped-resistable filter (902)) input, ADC(903) input output connection DSP(904), DSP(904) input output connection DAC(905), DAC(905) output connects the input of reconfigurable filter (906), the control end of the output connected vector modulator (205) of reconfigurable filter (906) and the control end of vector modulator (502), the clock output of Clock management (907) connects respectively ADC(903), DSP(904), DAC(905) clock pin, lower frequency changer circuit (901) arrives intermediate-freuqncy signal by the frequency spectrum shift of radiofrequency signal, the design of frequency overlapped-resistable filter (902) will meet the requirement of low pass sampling, ADC(903) and device DAC(905) choose requirement that need to consider bit wide and sampling, the design cut-off frequency that 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 signals and process, 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, must there is higher clock stability.
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| CN111900943B (en) * | 2020-07-14 | 2023-05-05 | 电子科技大学 | Radio frequency broadband high-efficiency rectifier |
| CN113131873A (en) * | 2021-03-12 | 2021-07-16 | 南京国微电子有限公司 | Self-adaptive feedforward linear power amplifier |
| 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 |
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