CN103401515A - Feedforward power amplifier for self-adaptive frequency compensation - Google Patents
Feedforward power amplifier for self-adaptive frequency compensation Download PDFInfo
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Abstract
The invention discloses a feedforward power amplifier for self-adaptive frequency compensation. The feedforward power amplifier comprises a first power divider, a first phase vector regulator, a digital device for frequency detection, a main amplifier, a first coupler, a time delay filter, a first combiner, a first amplitude vector regulator, a second power divider, a second coupler, a time delay unit, a second combiner, a second amplitude vector regulator, a second phase vector regulator, an error amplifier, a wave detector and a control module, wherein the first phase vector regulator and the first amplitude vector regulator are used for regulating a primary offset loop circuit; the second phase vector regulator and the second amplitude vector regulator are used for regulating a secondary offset loop circuit. The primary offset loop circuit is used for extracting input signal frequency and power data; part of the amplified output coupling signals of the main signals are offset by input coupling signals; error signals are extracted. In the second stage offset loop circuit, the error signals are offset by amplified output main signals after being amplified, so as to offset distorted signals and realize linearization of power amplification.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to the adaptive feedforward power amplifier.
Background technology
The communications field uses maximum linearization techniques that digital pre-distortion technology (DPD) and feed-forward technique are arranged at present.Because feed-forward technique can be realized very wide bandwidth, the linear gauging ability is strong, and digital pre-distortion technology is not supported frequency hopping at present in addition, and feed-forward technique remains the linearization technique of multi-carrier base station power amplifier main flow.
As shown in Figure 1, the principle of traditional dicyclo feedforward system: be distributed into two-way through the power splitter constant power after the signal input, one road signal is after main power amplifier amplifies, through a part of signal of coupler 1 coupling, deliver to synthesizer again, another road signal is input to synthesizer after delay line 1, two paths of signals is offset at the synthesizer place, extracts the nonlinear distortion signal of main power amplifier.The nonlinear distortion signal that extracts, amplify through the error power amplifier, is input to coupler 2, and coupler 1 through connect signal is input to coupler 2 after delay line 2, on coupler 2 Chu He roads, offsets, and balances out distorted signal and then export.Feed Forward Power Amplifier just can be good at offsetting distorted signal in theory, but along with the incoming frequency of amplifier changes, at this moment mismatch has just appearred in the amplitude of loop and phase parameter, and feedforward system signal cancellation performance will slacken greatly, just sharply the deterioration of the linearity of whole system.In order to make feed forward power amplifier realize very wide bandwidth, solve in feed-forward technique the impact while inputting different frequency, guarantee the stable of system linearity and work, must add adaptive carrier to offset control method.The adaptive approach that has obtained fine application has: pilot signal detection adaptive approach and minimum power detect adaptive approach.
Pilot signal detection method is the pilot signal of introducing a suitable watt level in circuit, pilot signal enter after feedforward system will be counted as a reference signal and counteracting to a certain extent.If this pilot signal has been cancelled by feedforward loop circuit, need so the signal of offsetting also can be carried out maximum compression by feedforward loop circuit, by detecting the size of pilot signal, vector adjuster in regulation loop, realize the self adaptation adjusting.There is following shortcoming in the pilot tone self adaptation: at first, the circuit of pilot tone adaptive approach is very complicated, and cost is high; Secondly, according to the pilot tone adaptive principle, the pilot tone adaptive approach can be introduced an extra frequency, and the signal of this frequency can not be offset fully, will in equipment, introduce like this one additional spuious.
The minimum power detection method is that the signal cancellation loop power output is carried out to energy measuring, take the power output minimum as target, automatically regulates the vector adjuster, realizes in this way adaptive control.The minimum power detection method is used and is existed great limitation capable, and it can only be used in first ring and offset loop, realizes the adaptive control of error signal extraction.At feed-forward amplifier the second ring, offset loop, after feedforward the second loop realization counteracting, the power of main signal will be far longer than distorted signal, usually large 60dBC is even more, therefore by power detecting method, the power of error signal can't be detected so at all, also just can't judge the counteracting situation and realize adaptive control.
Summary of the invention
The present invention seeks to solve the impact that distorted signal extracting loops carrier wave in feed-forward technique changes enjoying frequency parameter, guarantee linearity and work stable of amplifier under very wide bandwidth.
Technical scheme of the present invention is a kind of feed forward power amplifier for adaptive frequency compensation, the digital device, main amplifier, the first coupler, filtering wave by prolonging time device, the first mixer, the first amplitude vector adjuster, the second power splitter, the second coupler, delayer, the second mixer, the second amplitude vector adjuster, second-phase bit vector adjuster, error amplifier, wave detector and the control module that comprise the first power splitter, first-phase bit vector adjuster, detection frequency
The first power splitter connects respectively first-phase bit vector adjuster and delayer, digital device, main amplifier, the first coupler, the filtering wave by prolonging time device of first-phase bit vector adjuster, detection frequency connect successively, and the coupled signal output of the first coupler is through first amplitude vector adjuster input the second power splitter; The output of the second power splitter connects respectively a road input of the digital device that detects frequency and the second mixer, and delayer connects another road input of the second mixer; The output of the second mixer connects the second coupler, the second amplitude vector adjuster, second-phase bit vector adjuster, error amplifier successively, the coupled signal output access wave detector of the second coupler; The filtering wave by prolonging time device is connected the first mixer with error amplifier; Control module is connected respectively with wave detector with the digital device, first-phase bit vector adjuster, second-phase bit vector adjuster, the first amplitude vector adjuster, the second amplitude vector adjuster that detect frequency.
And, adopt the first amplitude vector adjuster and the first amplitude vector adjuster to regulate the first order and offset loop, adopt the second amplitude vector adjuster and the second amplitude vector adjuster to regulate the second level and offset loop, the described first order is offset loop and is comprised the first power splitter, main amplifier, the first coupler, the second power splitter, delayer and the second mixer, and the described second level is offset loop and comprised that the second coupler, error amplifier and the first mixer form the second level and offset loop;
After mobile communication signal enters, first by the first power splitter, the first power splitter is divided into two parts by the mobile communication signal of input, wherein a part of signal is designated as A1, signal A1, through first-phase bit vector adjuster, inputs to the digital device that detects frequency and processes, and after processing, signal is input to main amplifier, by the first coupler, the through connect signal of the first coupler enters the first mixer through the filtering wave by prolonging time device after main amplifier amplifies; The coupled signal that the first coupler produces is after the first amplitude vector adjuster, through the second power splitter, be divided into two parts, a part of signal is designated as B1, and signal B1 feeds back to the digital device that detects frequency, another part signal is designated as B2, and signal B2 enters the second mixer;
Another road signal of the first power splitter output is designated as A2, and signal A2 enters the second mixer after the delayer time delay, and two paths of signals A2 and B2 cancel each other at the second mixer place; The second mixer output signal enters the second coupler, the coupled signal input wave detector that the second coupler produces; Control module, according to wave detector gained detected value size adjustment the first amplitude vector adjuster and first-phase bit vector adjuster, makes the second mixer output signal gross power minimum, extracts distorted signal; Distorted signal is adjusted through the second amplitude vector adjuster, second-phase bit vector adjuster through the through connect signal of the second coupler output, then through error amplifier, is amplified into the first mixer; The two paths of signals that enters the first mixer completes counteracting at the first mixer place, obtain closing road after signal be the radio frequency amplifying signal that the linearity is very high.
And, in control module, preset second-phase bit vector adjuster and the second amplitude vector adjuster respective frequencies arranges table, control module, according to the signal B1 that feeds back to the digital device that detects frequency, is regulated second-phase bit vector adjuster and the second amplitude vector adjuster.
Compared to the prior art, the present invention has following advantage: at first, the present invention has overcome the shortcoming of traditional pilot signal detection method circuit complexity, and circuit is simple, easily realization, and cost is low.Secondly, solve minimum power and detected the drawback that self adaptation can't be applied in the second ring.Again, can not introduce new distortion frequency, it is stronger that ability is offset in linearisation.Finally, according to built-in in advance distortion, extract the mapping relations of signal amplitude, phase place and incoming frequency, after input signal being detected, amplitude and the error of distortion being extracted to signal are set to optimum state, thereby solved error amplifier inconsistent problem of the linearity of different frequency in device bandwidth, increase the bandwidth of Feed Forward Power Amplifier, and realized the consistency in the linear compensation full bandwidth.
The accompanying drawing explanation
Fig. 1 is traditional twin-stage feed forward power amplifier theory diagram.
Fig. 2 provides the feed forward power amplifier theory diagram that has used the current detecting adaptive approach for the embodiment of the present invention.
Embodiment
The feed forward power amplifier that the present invention proposes can be realized adaptive frequency compensation, the error vector adjuster of feed forward power amplifier is followed the variation of the frequency of input carrier signal and is automatically regulated amplitude and the phase place that signal is extracted in distortion, thereby make distortion extract signal and offset in loop at distorted signal the best counteracting state that is in all the time, thereby make the linearity of Feed Forward Power Amplifier reach optimum.
Below in conjunction with drawings and Examples, describe technical solution of the present invention in detail.
Refer to Fig. 2, the present invention specifically comprises: digital device, main amplifier, the first coupler, filtering wave by prolonging time device, the first mixer, the first amplitude vector adjuster, the second power splitter, the second coupler, delayer, the second mixer, the second amplitude vector adjuster, second-phase bit vector adjuster, error amplifier, wave detector, the control module of the first power splitter, first-phase bit vector adjuster, detection frequency.
The first power splitter connects respectively first-phase bit vector adjuster and delayer, digital device, main amplifier, the first coupler, the filtering wave by prolonging time device of first-phase bit vector adjuster, detection frequency connect successively, and the coupled signal output of the first coupler is through first amplitude vector adjuster input the second power splitter; The output of the second power splitter connects respectively a road input of the digital device that detects frequency and the second mixer, and delayer connects another road input of the second mixer; The output of the second mixer connects the second coupler, the second amplitude vector adjuster, second-phase bit vector adjuster, error amplifier successively, the coupled signal output access wave detector of the second coupler; The filtering wave by prolonging time device is connected the first mixer with error amplifier.Control module is connected respectively with wave detector with the digital device, first-phase bit vector adjuster, second-phase bit vector adjuster, the first amplitude vector adjuster, the second amplitude vector adjuster that detect frequency.Wherein, mainly by the first power splitter, main amplifier, the first coupler, the second power splitter, delayer and the second mixer, form the first order and offset loop, mainly by filtering wave by prolonging time device, the second coupler, error amplifier and the first mixer, form the second level and offset loop.
Operation principle: after mobile communication signal (RFin) enters embodiment power amplifier is provided, first by the first power splitter, the first power splitter is divided into two parts by input signal, wherein a part of signal is designated as A1, and signal A1, through first-phase bit vector adjuster, inputs to the digital device that detects frequency and processes, after processing, signal is input to main amplifier, after main amplifier amplified, by the first coupler, the through connect signal of the first coupler entered the first mixer through the filtering wave by prolonging time device.The coupled signal that the first coupler produces is through the first amplitude vector adjuster, after adjusting range, through the second power splitter, be divided into two parts, a part of signal is designated as B1, and signal B1 feeds back to the digital device that detects frequency, another part signal is designated as B2, and signal B2 enters the second mixer.Another road signal of the first power splitter output is designated as A2, and signal A2 enters the second mixer after the delayer time delay, and two paths of signals A2 and B2 cancel each other at the second mixer place.The second mixer output signal enters the second coupler, and the coupled signal input wave detector that the second coupler produces is for power detection.Control module, according to wave detector detected value size, is regulated the first amplitude vector adjuster and first-phase bit vector adjuster automatically, makes the second mixer output signal gross power minimum, and namely the keynote signal is cancelled, and extracts distorted signal.This distortion is extracted signal and through the second amplitude vector adjuster, second-phase bit vector adjuster, is carried out the adjustment of amplitude and phase place through the through connect signal of the second coupler output, then after error amplifier amplifies, enter the first mixer.The two paths of signals that enters the first mixer completes counteracting at the first mixer place, obtain closing road after signal be the radio frequency amplifying signal (RFout) that the linearity is very high.
For the sake of ease of implementation, provide the amplifier specific implementation of embodiment to be described as follows:
Detect the digital device of frequency, this functions of modules is to detect in real time frequency and the watt level of input signal, and this transfer of data is to control module, and the phase and magnitude modulation of signal is extracted in the distortion that can be used for the second loop;
Main amplifier, comprise at least three grades of power tubes of cascade, and the signal of input is amplified, and the power output of power amplifier is exactly to amplify output by main amplifier, can produce nonlinear distortion component;
Error amplifier, comprise the power tube of level Four at least of cascade, and the distorted signal that extracts is amplified;
The first coupler, from coupling one tunnel radiofrequency signal main amplifier output radiofrequency signal;
The second coupler, from coupling one tunnel radiofrequency signal output radiofrequency signal after the second mixer;
The first mixer, synthetic from a coupling part and filtering wave by prolonging time device output signal power error amplifier output signal, balance out the distorted signal that contains in the main amplifier output signal;
The second mixer, the coupled signal that the first coupler produces produces with the second coupler after delay circuit coupled signal is synthetic at mixer place power, balances out carrier signal, extracts distorted signal;
The first power splitter, be divided into two paths of signals by input signal, and a road is for amplifying, and another road offsets for carrier wave;
The second power splitter, be divided into two paths of signals by the coupled signal of the first coupler, and frequency detecting and power detection processing are done for feeding back to the digital device that detects frequency in a road;
Delayer, a road signal that produces for the first power splitter provides certain time delay;
The filtering wave by prolonging time device, for the output of main amplifier provides certain time delay;
First-phase bit vector adjuster, regulate the phase place that the first order is offset output amplifying signal in loop; The first amplitude vector adjuster, regulate the amplitude that the first order is offset coupled signal in loop;
Second-phase bit vector adjuster, regulate the phase place that output amplifying signal in loop is offset in the second level;
The second amplitude vector adjuster, regulate the amplitude that coupled signal in loop is offset in the second level;
Wave detector, the watt level after function signal pre-amplification;
Control module, the performance number of monitoring detecting circuit, and the frequency that reports according to the digital device that detects frequency, control phase vector adjuster and amplitude vector adjuster automatically.
Above each parts can adopt the existing circuit devcie of prior art to realize, the digital device and the control module that detect frequency can adopt software mode to set in advance working method by those skilled in the art voluntarily as required.
While specifically carrying out the frequency compensation self adaptation, the adjusting of first order counteracting loop can be according to existing techniques in realizing, the adjusting of loop is offset in the second level can extract according to distortion the mapping relations of signal amplitude, phase place and incoming frequency, at preset table of control module internal initialization, this preset form, under corresponding varying input signal frequency, arranges the phase and magnitude that signal is extracted in distortion.This table can pass through in advance through go-and-return test, under the input signal of different frequency, debugging second-phase bit vector adjuster and the second amplitude vector adjuster, the linearity of statistics output signal, record the settings of linearity second-phase bit vector adjuster and second amplitude vector adjuster preferably the time, then the signal frequency of corresponding this moment is made form and is preset in control module.During normal operation, the digital device that detects frequency reports the frequency input signal data, can second-phase bit vector adjuster and the second amplitude vector adjuster be set table look-at, the phase and magnitude of signal is extracted in the initialization distortion, completes fast the self adaptation setting of the second loop.
For the sake of ease of implementation, the detailed treatment step while below introducing amplifier that the embodiment of the present invention provides work, carry out one time according to the following steps order during power-up initializing, then enters the self adaptation circulation adjusting stage:
Step 1: after radiofrequency signal enters embodiment power amplifier is provided, be introduced into the first power splitter.These signals can be the signals of the existing standard different frequency range of GSM, CDMA, WCDMA etc.;
Step 2: radiofrequency signal, after step 1 is processed, is divided into two paths of signals, and a road is for treating amplifying signal (signal A1), and a road is for extracting signal (signal A2).The power splitter power division is determined on a case-by-case basis, and usually can be considered constant power and distributes.Extract signal power this moment very little, only contain input carrier signal, do not contain the nonlinear distortion signal.
Step 3: in step 2, treat amplifying signal A1, after first-phase bit vector adjuster, the phase place that can regulate this signal., the initial value of first-phase bit vector adjuster is preset in control module, during power-up initializing, by initial value, regulates, follow-up can automatically the adjusting.
Step 4: the extraction signal A2 in step 2, enter delayer, the time delay that delayer produces, should equal the time delay that produces when amplifying signal A1 enters the second mixer after the digital device that detects frequency, main amplifier, the first coupler, the first amplitude vector adjuster, the second amplifirer in theory.
Step 5: but the signal of control phase in step 3, enter the digital device that detects frequency, carry out digital processing and extract size and the frequency information of input signal, extract the data obtained and be transferred to control module for adapting data processing, concrete extracting mode is prior art, and it will not go into details in the present invention.
Step 6: the signal of processing in step 5, output, produced distorted signal in its output signal after main amplifier amplifies.
Step 7: the output signal in step 6, by the first coupler coupling, produce two paths of signals, be respectively through connect signal and coupled signal.The through connect signal decay is very little, and the degree of coupling is usually greater than 30dB.
Step 8: the through connect signal in step 7, the gained time delayed signal enters the first mixer after the time delay of filtering wave by prolonging time device, the time delay of filtering wave by prolonging time device generation herein, equal the coupled signal in step 7 produces after the first amplitude vector adjuster, the second power splitter, the second mixer, the second coupler, the second amplitude vector adjuster, second-phase bit vector adjuster, error amplifier time delay in theory.
Step 9: the coupled signal that produces in step 7, through the first amplitude vector adjuster, carry out the amplitude modulation processing, the first amplitude vector adjuster is directly controlled by control module, during power-up initializing, by initial value, regulates follow-up can automatically the adjusting.
Step 10: the signal of processing through the first amplitude vector adjuster in step 9, through the second power splitter, be divided into two paths of signals, a road signal (signal B1) is for feedback, and a road signal (signal B2) is be used to closing road.Being generally constant power herein distributes.
Step 11: the signal B1 for feedback in step 10, input detects the digital device of frequency, the digital device that detects frequency uses the input signal A1 in this signal B1 and step 3 to compare, and produces size and the frequency data of input signal A1, is transferred to control module.Specific implementation can adopt prior art, and the digital device that for example detects frequency adopts the SC1887 chip of Scintera company.Wherein, the transmission intercal of the digital device of predeterminable detection frequency, complain to size and the frequency information of control module output signal when the digital device interval 20MS that detects frequency for example is set.
Step 12: in step 10 be used to closing the signal B2 on road, enter the second mixer, the delay time signal that produces with delayer in step 4 closes road, two paths of signals is cancelled each other, and extracts distorted signal.
After in step 13, step 12, offsetting, the distorted signal of output, by the second coupler, produces two paths of signals and is respectively through connect signal and coupled signal.The degree of coupling is designed to 10dB herein.
Step 14: the through connect signal in step 13, through the second amplitude vector adjuster, carry out the amplitude modulation processing, obtain the second amplitude vector adjuster and directly by control module, controlled, can automatically regulate.
Step 15: the amplitude-modulated signal in step 14, through second-phase bit vector adjuster, carry out the phase modulation processing, second-phase bit vector adjuster is directly controlled by control module, can automatically regulate.During concrete enforcement, signal magnitude and frequency data that control module is complained to according to the digital device that detects frequency in step 11, look into the second built-in amplitude vector adjuster and the preset table of second-phase bit vector adjuster, the second amplitude vector adjuster and second-phase bit vector adjuster are set to corresponding state
Step 16: in step 15 through the signal of amplitude modulation and phase modulation, through error amplifier, amplify, signal power is less herein, the linearity of error amplifier is much better than main amplifier, the distorted signal of generation can be ignored and not remember.
Step 17: the process amplifying signal in step 16, enter the first mixer, with the time delayed signal that produces in step 8, close road, balance out the distortion component in time delayed signal, improve its linearity.After closing road, signal is the radio frequency amplifying signal that the linearity is very high.
The self adaptation circulation adjusting stage continues to carry out, and concrete the adjusting is achieved as follows:
(1) to the coupled signal of the second coupler, (referring to step 13), by wave detector, detect its size, export the magnitude of voltage corresponding with watt level and process to control module.
(2) control module is according to the current signal magnitude of complaining to of digital device and the frequency data (referring to detecting step 11) that detect frequency, look into the second built-in amplitude vector adjuster and the preset table of second-phase bit vector adjuster, the second amplitude vector adjuster and second-phase bit vector adjuster are set to corresponding state.
(3) control module detects the voltage minimum as purpose take wave detector, Lookup protocol the first amplitude vector adjuster and first-phase bit vector adjuster, and with the different counteracting situation of correspondence, specific implementation is prior art.Control module is regulated the first amplitude vector adjuster and first-phase bit vector adjuster can change the counteracting situation of the second mixer (referring to step 12), the power of Shi He road output changes, thereby cause coupled signal power (referring to step 13), to change, thereby cause wave detector to detect change in voltage.
(4) when frequency input signal changes, the digital device that detects frequency can detect and changes and pass to control module, and this moment, control module was returned to (1), through circulation self adaptation adjusting maintenance wave detector, detected voltage and was adjusted to minimum.
When the wave detector power detection is adjusted to hour, carrier signal can be cancelled minimum, and distorted signal extracts purer, and the neutralization effect of last the first mixer is better.
Above-mentioned adaptive adjusting, automatically, arrange take the power detection minimum as purpose in real time, guaranteed that carrier wave offsets to remain and offset preferably, removed the impact that environment and temperature parameter change.And when frequency input signal changes, can table be set by the second preset amplitude vector adjuster and second-phase bit vector adjuster, the distorted signal at the first mixer place is offseted and is adjusted to optimum state, and then automatic, the real-time setting to guarantee that the second mixer place carrier signal offsets to optimum state.Therefore realize the adaptive control that the Liang Chuhe road is offseted, improved and offseted precision, and increased and offset frequency bandwidth, guaranteed the consistency of equipment full bandwidth linear compensation.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (3)
1. feed forward power amplifier for adaptive frequency compensation, it is characterized in that: the digital device, main amplifier, the first coupler, filtering wave by prolonging time device, the first mixer, the first amplitude vector adjuster, the second power splitter, the second coupler, delayer, the second mixer, the second amplitude vector adjuster, second-phase bit vector adjuster, error amplifier, wave detector and the control module that comprise the first power splitter, first-phase bit vector adjuster, detection frequency
The first power splitter connects respectively first-phase bit vector adjuster and delayer, digital device, main amplifier, the first coupler, the filtering wave by prolonging time device of first-phase bit vector adjuster, detection frequency connect successively, and the coupled signal output of the first coupler is through first amplitude vector adjuster input the second power splitter; The output of the second power splitter connects respectively a road input of the digital device that detects frequency and the second mixer, and delayer connects another road input of the second mixer; The output of the second mixer connects the second coupler, the second amplitude vector adjuster, second-phase bit vector adjuster, error amplifier successively, the coupled signal output access wave detector of the second coupler; The filtering wave by prolonging time device is connected the first mixer with error amplifier; Control module is connected respectively with wave detector with the digital device, first-phase bit vector adjuster, second-phase bit vector adjuster, the first amplitude vector adjuster, the second amplitude vector adjuster that detect frequency.
2. according to claim 1 for the feed forward power amplifier of adaptive frequency compensation, it is characterized in that: adopt the first amplitude vector adjuster and the first amplitude vector adjuster to regulate the first order and offset loop, adopt the second amplitude vector adjuster and the second amplitude vector adjuster to regulate the second level and offset loop, the described first order is offset loop and is comprised the first power splitter, main amplifier, the first coupler, the second power splitter, delayer and the second mixer, the described second level is offset loop and is comprised the second coupler, error amplifier and the first mixer form the second level and offset loop,
After mobile communication signal enters, first by the first power splitter, the first power splitter is divided into two parts by the mobile communication signal of input, wherein a part of signal is designated as A1, signal A1, through first-phase bit vector adjuster, inputs to the digital device that detects frequency and processes, and after processing, signal is input to main amplifier, by the first coupler, the through connect signal of the first coupler enters the first mixer through the filtering wave by prolonging time device after main amplifier amplifies; The coupled signal that the first coupler produces is after the first amplitude vector adjuster, through the second power splitter, be divided into two parts, a part of signal is designated as B1, and signal B1 feeds back to the digital device that detects frequency, another part signal is designated as B2, and signal B2 enters the second mixer;
Another road signal of the first power splitter output is designated as A2, and signal A2 enters the second mixer after the delayer time delay, and two paths of signals A2 and B2 cancel each other at the second mixer place; The second mixer output signal enters the second coupler, the coupled signal input wave detector that the second coupler produces; Control module, according to wave detector gained detected value size adjustment the first amplitude vector adjuster and first-phase bit vector adjuster, makes the second mixer output signal gross power minimum, extracts distorted signal; Distorted signal is adjusted through the second amplitude vector adjuster, second-phase bit vector adjuster through the through connect signal of the second coupler output, then through error amplifier, is amplified into the first mixer; The two paths of signals that enters the first mixer completes counteracting at the first mixer place, obtain closing road after signal be the radio frequency amplifying signal that the linearity is very high.
3. according to claim 2 for the feed forward power amplifier of adaptive frequency compensation, it is characterized in that: in control module, preset second-phase bit vector adjuster and the second amplitude vector adjuster respective frequencies arranges table, control module, according to the signal B1 that feeds back to the digital device that detects frequency, is regulated second-phase bit vector adjuster and the second amplitude vector adjuster.
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| US10539946B2 (en) | 2016-05-12 | 2020-01-21 | Siemens Aktiengesellschaft | Closed-loop control device with adaptive fault compensation |
| CN107367932A (en) * | 2016-05-12 | 2017-11-21 | 西门子公司 | Adjusting means with adaptive error compensation |
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| CN108134583A (en) * | 2017-12-28 | 2018-06-08 | 电子科技大学 | A kind of error negative feedback arized power amplifying device and method |
| CN108390651A (en) * | 2018-02-09 | 2018-08-10 | 厚元技术控股有限公司 | A kind of radio-frequency power amplifier and counteracting method of adaptive feedback canceller distorted signal |
| CN112068057A (en) * | 2020-08-31 | 2020-12-11 | 中电科仪器仪表有限公司 | Self-adaptive calibration compensation method for accurate power display |
| CN112068057B (en) * | 2020-08-31 | 2023-02-17 | 中电科思仪科技股份有限公司 | Self-adaptive calibration compensation method for accurate power display |
| CN112688648A (en) * | 2020-12-29 | 2021-04-20 | 京信网络系统股份有限公司 | Power combining apparatus and method |
| WO2023087200A1 (en) * | 2021-11-18 | 2023-05-25 | 华为技术有限公司 | Signal processing apparatus and communication device |
| CN117579008A (en) * | 2024-01-17 | 2024-02-20 | 南京纳特通信电子有限公司 | Overload signal prevention automatic adjusting device and adjusting method for power amplifier system |
| CN117579008B (en) * | 2024-01-17 | 2024-04-02 | 南京纳特通信电子有限公司 | Overload signal prevention automatic adjusting device and adjusting method for power amplifier system |
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