CN101807886B - Radio frequency power amplifying device and analog predistortion correction method thereof - Google Patents

Radio frequency power amplifying device and analog predistortion correction method thereof Download PDF

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Publication number
CN101807886B
CN101807886B CN2010101373415A CN201010137341A CN101807886B CN 101807886 B CN101807886 B CN 101807886B CN 2010101373415 A CN2010101373415 A CN 2010101373415A CN 201010137341 A CN201010137341 A CN 201010137341A CN 101807886 B CN101807886 B CN 101807886B
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frequency power
signal
radio
power amplifier
coupler
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CN101807886A (en
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丁志佳
刘义
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SHENZHEN WINHAP COMMUNICATIONS Inc
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SHENZHEN WINHAP COMMUNICATIONS Inc
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Abstract

The invention is suitable for the technical field of the power amplifier design and provides a radio frequency power amplifying device and an analog predistortion correction method thereof. The device comprises an analog predistortion correction system, a first coupler, a third coupler, wherein the analog predistortion correction system divides an input signal of a radio frequency power amplifier, which is coupled by the first coupler, into a first signal and a second signal; the first signal is used for counteracting a main signal of an output signal of the radio frequency power amplifier to obtain a distortion signal; the predistortion processing with the corresponding strength is carried out on the second signal according to the distortion signal; and a second coupler couples and inputs the processed second signal and the rest part of the input signal of the radio frequency power amplifier into the radio frequency power amplifier. Due to adoption of the closed-loop control, the invention improves the improving effect on the linearity of the radio frequency power amplifier and has very good applicability.

Description

A kind of radio frequency power amplifying device and analog predistortion correction method thereof
Technical field
The invention belongs to the Designing power amplifier technical field, relate in particular to a kind of radio frequency power amplifying device and analog predistortion correction method thereof.
Background technology
Along with the formal commercialization of 3G (Third Generation) Moblie technology (3G), bandwidth of operation, the linearity of communication equipment are had higher requirement in China.
Traditional radio-frequency power amplifier is to satisfy system to the requirement of the linearity through the back-off method; This method is easy to realize; But the efficient of system greatly reduces; For this reason, the radio frequency power amplifying device that prior art provides is through nonlinear device radio frequency threshold analog signal directly to be carried out pre-distortion, produces distorted signal to offset the distortion of radio-frequency power amplifier.Yet, because this kind radio frequency power amplifying device of providing of prior art has been used open loop control, to the linearity of radio-frequency power amplifier to improve effect limited, generally can improve 1-3dB, application is not good.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of radio frequency power amplifying device; The radio frequency power amplifying device that being intended to solve prior art provides is used open loop control and is offset the distortion of radio-frequency power amplifier to produce distorted signal; To the linearity of radio-frequency power amplifier to improve effect limited, the problem that application is not good.
The embodiment of the invention is achieved in that a kind of radio frequency power amplifying device, comprises radio-frequency power amplifier, and said radio frequency power amplifying device also comprises:
The analog predistortion corrective system;
First coupler is used for the said analog predistortion corrective system of part coupling input with the input signal of said radio-frequency power amplifier;
The 3rd coupler is used for the said analog predistortion corrective system of output signal coupling input with said radio-frequency power amplifier;
Said analog predistortion corrective system is used to receive the part of the input signal of said radio-frequency power amplifier; With the input signal of the said radio-frequency power amplifier part through the said first coupler coupled signal as first signal, with the input signal of the said radio-frequency power amplifier remaining part through the said first coupler coupled signal as secondary signal; The output signal of the said radio-frequency power amplifier that receives with said first signal cancellation; Obtain distorted signal, afterwards, detect the size of said distorted signal; And, said secondary signal is carried out the pre-distortion of respective strengths according to the size of detected said distorted signal;
Second coupler is used for after the remaining part coupling of the input signal of secondary signal after the pre-distortion and said radio-frequency power amplifier, importing said radio-frequency power amplifier;
Said radio frequency power amplifying device also comprises:
Be connected in first balanced to unbalanced transformer between said first coupler and the said analog predistortion corrective system;
Be connected in second balanced to unbalanced transformer between said the 3rd coupler and the said analog predistortion corrective system;
Be connected in the 3rd balanced to unbalanced transformer between said second coupler and the said analog predistortion corrective system;
Said first balanced to unbalanced transformer, said second balanced to unbalanced transformer and said the 3rd balanced to unbalanced transformer are used for the impedance transformation of ratios such as carrying out to the received signal.
Another purpose of the embodiment of the invention is to provide a kind of analog predistortion correction method of aforesaid radio frequency power amplifying device, said method comprising the steps of:
First coupler is with the part coupling input analog predistortion corrective system of the input signal of radio-frequency power amplifier;
The 3rd coupler is with the output signal coupling input analog predistortion corrective system of said radio-frequency power amplifier;
The analog predistortion corrective system receives the part of the input signal of said radio-frequency power amplifier; With the input signal of the said radio-frequency power amplifier part through the said first coupler coupled signal as first signal, with the input signal of the said radio-frequency power amplifier remaining part through the said first coupler coupled signal as secondary signal; Output signal with the said radio-frequency power amplifier of said first signal cancellation; Obtain distorted signal; Detect the size of said distorted signal afterwards; And according to the size of detected said distorted signal, said secondary signal is carried out the pre-distortion of respective strengths, the said radio-frequency power amplifier of remaining part coupling input of the input signal of said secondary signal and the said radio-frequency power amplifier of second coupler after with pre-distortion;
First balanced to unbalanced transformer, second balanced to unbalanced transformer and the 3rd balanced to unbalanced transformer such as carry out to the received signal at the impedance transformation of ratio.
The radio frequency power amplifying device that the embodiment of the invention provides is the output signal through the radio-frequency power amplifier feedback; And combine first signal to adjust pre-distortion effect to secondary signal by the analog predistortion corrective system, because this radio frequency power amplifying device has adopted a close-loop feedback control system.Improved the accuracy of control, thereby improved the effect of improving to the linearity of radio-frequency power amplifier, application is good, and implementation is simple, can reduce the correction cost of analog predistortion; This radio frequency power amplifying device has been taken into account the power amplification efficiency problem simultaneously, experiment showed, that this control system can be so that the efficient of radio-frequency power amplifier reaches 33% when radio-frequency power amplifier is selected the power amplifier based on Doherty technology for use.
Description of drawings
Fig. 1 is the theory structure block diagram of the radio frequency power amplifying device that provides of the embodiment of the invention;
Fig. 2 is the flow chart of the analog predistortion correction method of the radio frequency power amplifying device that provides of the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 is the theory structure block diagram of the radio frequency power amplifying device that provides of the embodiment of the invention, for the ease of explanation, only shows the part relevant with the embodiment of the invention.
The radio frequency power amplifying device that the embodiment of the invention provides comprises: radio-frequency power amplifier 18; Analog predistortion corrective system 11; First coupler 12 and first balanced to unbalanced transformer, 13, the first couplers 12 are used for the part of the input signal of radio-frequency power amplifier 18 is imported analog predistortion corrective systems 11 through 13 couplings of first balanced to unbalanced transformer; The 3rd coupler 15 and second balanced to unbalanced transformer, 16, the three couplers 15 are used for the output signal of radio-frequency power amplifier 18 is imported analog predistortion corrective systems 11 through 16 couplings of second balanced to unbalanced transformer.
Analog predistortion corrective system 11 is used for the part of the input signal of received RF power amplifier 18; With the input signal of radio-frequency power amplifier 18 part through first coupler, 12 coupled signals as first signal, with the input signal of radio-frequency power amplifier 18 remaining part through first coupler, 12 coupled signals as secondary signal; The output signal of the said radio-frequency power amplifier that receives with first signal cancellation; Obtain distorted signal; Afterwards, detect the size of this distorted signal, and according to the size of detected distorted signal; Secondary signal is carried out the pre-distortion of respective strengths, the remaining part input radio frequency power amplifier 18 of the input signal of secondary signal after pre-distortion and radio-frequency power amplifier 18.
The radio frequency power amplifying device that the embodiment of the invention provides also comprises: second coupler 14 and the 3rd balanced to unbalanced transformer 17; After second coupler 14 is used for the remaining part through the input signal of the secondary signal after the pre-distortion and radio-frequency power amplifier that sends through the 3rd balanced to unbalanced transformer 17 is coupled, input radio frequency power amplifier 18.
Radio-frequency power amplifier 18 wherein can be to be applied in the existing communication system, and any of the power amplifier that is used for high-frequency signal is amplified preferably selected the power amplifier based on the Doherty technology for use, so that system has higher efficient; The input signal of radio-frequency power amplifier 18 wherein is meant the input signal of the radio frequency threshold of radio-frequency power amplifier 18.
The radio frequency power amplifying device that the embodiment of the invention provides is the output signal through the radio-frequency power amplifier feedback; And combine first signal to adjust pre-distortion effect to secondary signal by analog predistortion corrective system 11; Because this radio frequency power amplifying device has adopted a close-loop feedback control system; Improved the accuracy of control, thereby improved the effect of improving to the linearity of radio-frequency power amplifier, application is good; And implementation is simple, can reduce the correction cost of analog predistortion; This radio frequency power amplifying device has been taken into account the power amplification efficiency problem simultaneously, experiment showed, that this control system can be so that the efficient of radio-frequency power amplifier reaches 33% when radio-frequency power amplifier is selected the power amplifier based on Doherty technology for use.
Analog predistortion corrective system 11 further comprises: first signal receiving unit 111, be used for the part of the input signal of received RF power amplifier 18, and the part in should part signal is as first signal; Secondary signal receiving element 112 is used for the output signal of received RF power amplifier 18; The 3rd signal receiving unit 115 is used for the part of the input signal of received RF power amplifier 18, and the remaining part in should part signal is as secondary signal; Distorted signal acquiring unit 113, the output signal of the frequency power amplifier that is used for receiving with the first signal cancellation secondary signal receiving element 112 obtains distorted signal; Distorted signal detecting unit 114 is used to detect the size of the distorted signal that distorted signal acquiring unit 113 obtains; Pre-distortion unit 116 is used for the size according to distorted signal detecting unit 114 detected distorted signals, secondary signal is carried out the pre-distortion of respective strengths.
Wherein, The effect of first balanced to unbalanced transformer 13, second balanced to unbalanced transformer 16 and the 3rd balanced to unbalanced transformer 17 is the impedance transformation of ratio such as carrying out to the received signal; The coupling of the output through emulation first balanced to unbalanced transformer 13, second balanced to unbalanced transformer 16 or the 3rd balanced to unbalanced transformer 17 makes analog predistortion corrective system 11 reach best operating frequency and bandwidth.Therefore, when concrete the application, can remove one or more in first balanced to unbalanced transformer 13, second balanced to unbalanced transformer 16 or the 3rd balanced to unbalanced transformer 17.
Wherein, first coupler 12 is connected with second coupler 14 through a line of time delay, and the input signal of radio-frequency power amplifier 18 sends second coupler 14 via the remaining part after 12 couplings of first coupler to via this line of time delay.This line of time delay can be offset secondary signal when carrying out pre-distortion; With respect to the time delay that remaining part produced of the input signal of radio-frequency power amplifier 18, so that on time delay, be consistent through the remaining part of the input signal of secondary signal after the pre-distortion and radio-frequency power amplifier 18.
Because the pre-distortion process to secondary signal can be so that the amplitude of secondary signal and phase place all produce distortion; And the phase change scope can reach 2 π; Be one-period T; Therefore, secondary signal can differ one-period T through the remaining part of the input signal of time delay T1 after the pre-distortion and radio-frequency power amplifier through the time delay T2 behind this line of time delay, that is to say; Can there be error in the length of this line of time delay, and error range is the length that the input signal of radio-frequency power amplifier is propagated in one-period.Because the spread length of input signal in one-period of radio-frequency power amplifier is the wavelength of the input signal of radio-frequency power amplifier; If the wavelength of the input signal of radio-frequency power amplifier is λ p; The error in length of this line of time delay is L, then can be known by above analysis, and the error in length scope of this line of time delay can be expressed as :-λ p/2≤L≤λ p/2; Through regulating the length of this line of time delay, can change the distortion effect of the signal of input radio frequency power amplifier.
In addition; Because the signal of 11 pairs of inputs of analog predistortion corrective system has certain dynamic range; For this reason; This radio frequency power amplifying device also comprises the first amplitude modulator (not shown) that connects first coupler 12, and the 3rd coupler 15 specifically connects second balanced to unbalanced transformer 16 through the second amplitude modulator (not shown).Through this first amplitude modulator, can adjust the size of exporting to the signal of analog predistortion corrective system 11 by first balanced to unbalanced transformer 13; Through this second amplitude modulator; Can adjust the size of output signal of exporting to the radio-frequency power amplifier 18 of analog predistortion corrective system 11 by second balanced to unbalanced transformer 16, thereby make the signal of input analog predistortion corrective system 11 in certain dynamic range.
Fig. 2 shows the flow process of the analog predistortion correction method of above-mentioned radio frequency power amplifying device.
In step S101, first coupler is with the part coupling input analog predistortion corrective system of the input signal of radio-frequency power amplifier.
When above-mentioned radio frequency power amplifying device also comprised first balanced to unbalanced transformer, first coupler specifically was that the part of the input signal of radio-frequency power amplifier is imported the analog predistortion corrective system through first balanced to unbalanced transformer.
In step S102, the 3rd coupler is with the output signal coupling input analog predistortion corrective system of radio-frequency power amplifier.
When above-mentioned radio frequency power amplifying device also comprised second balanced to unbalanced transformer, the 3rd coupler specifically was that the output signal of radio-frequency power amplifier is imported the analog predistortion corrective system through the coupling of second balanced to unbalanced transformer.
In step S103; The part of the input signal of analog predistortion corrective system received RF power amplifier; With the input signal of the radio-frequency power amplifier part through the first coupler coupled signal as first signal, with the input signal of the radio-frequency power amplifier remaining part through the first coupler coupled signal as secondary signal; Output signal with the first signal cancellation radio-frequency power amplifier; Obtain distorted signal, detect the size of this distorted signal afterwards, and according to the size of detected distorted signal; Binary signal is carried out the pre-distortion of respective strengths, the remaining part coupling input radio frequency power amplifier of the input signal of secondary signal and the radio-frequency power amplifier of second coupler after with pre-distortion.
When above-mentioned radio frequency power amplifying device also comprised the 3rd balanced to unbalanced transformer, second coupler specifically was the secondary signal after the pre-distortion cell processing of just sending through the 3rd balanced to unbalanced transformer and the remaining part of the input signal of the radio-frequency power amplifier input radio frequency power amplifier that is coupled.
The analog predistortion correction method of the above-mentioned radio frequency power amplifying device that the embodiment of the invention provides is the output signal through the radio-frequency power amplifier feedback; And combine first signal to adjust pre-distortion effect to secondary signal by the analog predistortion corrective system; Because the analog predistortion correction method of this radio frequency power amplifying device has adopted a close-loop feedback control mode; Improved the accuracy of control, thereby improved the effect of improving to the linearity of radio-frequency power amplifier, application is good; And implementation is simple, can reduce the correction cost of analog predistortion; This radio frequency power amplifying device has been taken into account the power amplification efficiency problem simultaneously, experiment showed, that this control system can be so that the efficient of radio-frequency power amplifier reaches 33% when radio-frequency power amplifier is selected the power amplifier based on Doherty technology for use.
The radio frequency power amplifying device that the embodiment of the invention provides is the output signal through the radio-frequency power amplifier feedback; And combine first signal to adjust pre-distortion effect to secondary signal by the analog predistortion corrective system, because this radio frequency power amplifying device has adopted a close-loop feedback control system.Improved the accuracy of control, thereby improved the effect of improving to the linearity of radio-frequency power amplifier, application is good, and implementation is simple, can reduce the correction cost of analog predistortion; This radio frequency power amplifying device has been taken into account the power amplification efficiency problem simultaneously, experiment showed, that this control system can be so that the efficient of radio-frequency power amplifier reaches 33% when radio-frequency power amplifier is selected the power amplifier based on Doherty technology for use; In addition, first coupler is connected with second coupler through a line of time delay, so that be consistent on time delay through the remaining part of the input signal of secondary signal after the pre-distortion and radio-frequency power amplifier.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is can control relevant hardware through program to accomplish; Described program can be in being stored in a computer read/write memory medium; Described storage medium is like ROM/RAM, disk, CD etc.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. a radio frequency power amplifying device comprises radio-frequency power amplifier, it is characterized in that, said radio frequency power amplifying device also comprises:
The analog predistortion corrective system;
First coupler is used for the said analog predistortion corrective system of part coupling input with the input signal of said radio-frequency power amplifier;
The 3rd coupler is used for the said analog predistortion corrective system of output signal coupling input with said radio-frequency power amplifier;
Said analog predistortion corrective system is used to receive the part of the input signal of said radio-frequency power amplifier; With the input signal of the said radio-frequency power amplifier part through the said first coupler coupled signal as first signal, with the input signal of the said radio-frequency power amplifier remaining part through the said first coupler coupled signal as secondary signal; The output signal of the said radio-frequency power amplifier that receives with said first signal cancellation; Obtain distorted signal, afterwards, detect the size of said distorted signal; And, said secondary signal is carried out the pre-distortion of respective strengths according to the size of detected said distorted signal;
Second coupler is used for after the remaining part coupling of the input signal of secondary signal after the pre-distortion and said radio-frequency power amplifier, importing said radio-frequency power amplifier;
Said radio frequency power amplifying device also comprises:
Be connected in first balanced to unbalanced transformer between said first coupler and the said analog predistortion corrective system;
Be connected in second balanced to unbalanced transformer between said the 3rd coupler and the said analog predistortion corrective system;
Be connected in the 3rd balanced to unbalanced transformer between said second coupler and the said analog predistortion corrective system;
Said first balanced to unbalanced transformer, said second balanced to unbalanced transformer and said the 3rd balanced to unbalanced transformer are used for the impedance transformation of ratios such as carrying out to the received signal.
2. radio frequency power amplifying device as claimed in claim 1 is characterized in that, said radio frequency power amplifying device also comprises first amplitude modulator that connects said first coupler.
3. radio frequency power amplifying device as claimed in claim 1 is characterized in that said radio frequency power amplifying device also comprises second amplitude modulator, and said the 3rd coupler connects said second balanced to unbalanced transformer through said second amplitude modulator.
4. radio frequency power amplifying device as claimed in claim 1; It is characterized in that; Said first coupler is connected with said second coupler through a line of time delay, and the error in length scope of said line of time delay is the length that the said input signal of said radio-frequency power amplifier is propagated in one-period.
5. like each described radio frequency power amplifying device of claim 1 to 4, it is characterized in that said radio-frequency power amplifier is selected the power amplifier based on the Doherty technology for use.
6. the analog predistortion correction method like each described radio frequency power amplifying device of claim 1 to 4 is characterized in that, said method comprising the steps of:
First coupler is with the part coupling input analog predistortion corrective system of the input signal of radio-frequency power amplifier;
The 3rd coupler is with the output signal coupling input analog predistortion corrective system of said radio-frequency power amplifier;
The analog predistortion corrective system receives the part of the input signal of said radio-frequency power amplifier; With the input signal of the said radio-frequency power amplifier part through the said first coupler coupled signal as first signal, with the input signal of the said radio-frequency power amplifier remaining part through the said first coupler coupled signal as secondary signal; Output signal with the said radio-frequency power amplifier of said first signal cancellation; Obtain distorted signal; Detect the size of said distorted signal afterwards; And according to the size of detected said distorted signal, said secondary signal is carried out the pre-distortion of respective strengths, the said radio-frequency power amplifier of remaining part coupling input of the input signal of said secondary signal and the said radio-frequency power amplifier of second coupler after with pre-distortion;
First balanced to unbalanced transformer, second balanced to unbalanced transformer and the 3rd balanced to unbalanced transformer such as carry out to the received signal at the impedance transformation of ratio.
7. the analog predistortion correction method of radio frequency power amplifying device as claimed in claim 6 is characterized in that, said radio-frequency power amplifier is selected the power amplifier based on the Doherty technology for use.
CN2010101373415A 2010-03-26 2010-03-26 Radio frequency power amplifying device and analog predistortion correction method thereof Expired - Fee Related CN101807886B (en)

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CN103401512A (en) * 2013-08-01 2013-11-20 绵阳灵通电讯设备有限公司 Dual-loop structural simulation predistorter of BUC module
CN107431495B (en) * 2015-03-31 2020-01-03 华为技术有限公司 Digital predistortion correction method and device
CN106664269B (en) * 2015-05-30 2019-11-29 华为技术有限公司 A kind of analog predistortion APD correction system and method
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
CN110417366A (en) * 2019-08-20 2019-11-05 上海联影医疗科技有限公司 Radio-frequency power amplifier control device and radio-frequency power amplifier
CN113472299B (en) * 2020-03-30 2024-01-02 大唐移动通信设备有限公司 Signal receiving and transmitting front-end circuit

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