CN101807886A - 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 PDFInfo
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- CN101807886A CN101807886A CN 201010137341 CN201010137341A CN101807886A CN 101807886 A CN101807886 A CN 101807886A CN 201010137341 CN201010137341 CN 201010137341 CN 201010137341 A CN201010137341 A CN 201010137341A CN 101807886 A CN101807886 A CN 101807886A
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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
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 by 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 by 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 described radio frequency power amplifying device also comprises:
The analog predistortion corrective system;
First coupler is used for the described analog predistortion corrective system of part coupling input with the input signal of described radio-frequency power amplifier;
The 3rd coupler is used for the described analog predistortion corrective system of output signal coupling input with described radio-frequency power amplifier;
Described analog predistortion corrective system is used to receive the part of the input signal of described radio-frequency power amplifier, with the input signal of the described radio-frequency power amplifier part by the described first coupler coupled signal as first signal, with the input signal of the described radio-frequency power amplifier remaining part by the described first coupler coupled signal as secondary signal, the output signal of the described radio-frequency power amplifier that receives with described first signal cancellation, obtain distorted signal, afterwards, detect the size of described distorted signal, and, described secondary signal is carried out the pre-distortion of respective strengths according to the size of detected described distorted signal;
Second coupler is used for importing described radio-frequency power amplifier after the remaining part coupling of the input signal of secondary signal after the described pre-distortion system handles and described radio-frequency power amplifier.
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 described radio-frequency power amplifier;
The analog predistortion corrective system receives the part of the input signal of described radio-frequency power amplifier, with the input signal of the described radio-frequency power amplifier part by the described first coupler coupled signal as first signal, with the input signal of the described radio-frequency power amplifier remaining part by the described first coupler coupled signal as secondary signal, output signal with the described radio-frequency power amplifier of described first signal cancellation, obtain distorted signal, detect the size of described distorted signal afterwards, and according to the size of detected described distorted signal, described secondary signal is carried out the pre-distortion of respective strengths, the described secondary signal of second coupler after and the described radio-frequency power amplifier of remaining part coupling input of the input signal of described radio-frequency power amplifier with pre-distortion.
The radio frequency power amplifying device that the embodiment of the invention provides is the output signal by the radio-frequency power amplifier feedback, and adjust pre-distortion effect in conjunction with first signal 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 power amplifier based on the 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 purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.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 convenience 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 by 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 by 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, the input signal of radio-frequency power amplifier 18 is passed through the part of first coupler, 12 coupled signals as first signal, the input signal of radio-frequency power amplifier 18 is passed through the remaining part of first coupler, 12 coupled signals as secondary signal, the output signal of the described 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 the remaining part that second coupler 14 is used for the secondary signal after pre-distortion system 11 handles that will send by the 3rd balanced to unbalanced transformer 17 and the input signal of radio-frequency power amplifier is coupled, input radio frequency power amplifier 18.
Radio-frequency power amplifier 18 wherein can be to be applied in the existing communication system, is used for any of power amplifier that high-frequency signal is amplified, preferably selects 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 by the radio-frequency power amplifier feedback, and adjust pre-distortion effect in conjunction with first signal 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 power amplifier based on the 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 is used for the output signal of the frequency power amplifier that receives 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 by 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 by 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 as can be known from the above analysis, the error in length scope of this line of time delay can be expressed as :-λ p/2≤L≤λ p/2, by 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 by the second amplitude modulator (not shown).By 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; By 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 by 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 by 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, the input signal of radio-frequency power amplifier is passed through the part of the first coupler coupled signal as first signal, the input signal of radio-frequency power amplifier is passed through the remaining part of 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 secondary signal of second coupler after and the remaining part coupling input radio frequency power amplifier of the input signal of radio-frequency power amplifier 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 that just sends by 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 by the radio-frequency power amplifier feedback, and adjust pre-distortion effect in conjunction with first signal 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 power amplifier based on the Doherty technology for use.
The radio frequency power amplifying device that the embodiment of the invention provides is the output signal by the radio-frequency power amplifier feedback, and adjust pre-distortion effect in conjunction with first signal 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 power amplifier based on the Doherty technology for use; In addition, first coupler is connected with second coupler by 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 by program to finish, described program can be in being stored in a computer read/write memory medium, described storage medium is as ROM/RAM, disk, CD etc.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a radio frequency power amplifying device comprises radio-frequency power amplifier, it is characterized in that, described radio frequency power amplifying device also comprises:
The analog predistortion corrective system;
First coupler is used for the described analog predistortion corrective system of part coupling input with the input signal of described radio-frequency power amplifier;
The 3rd coupler is used for the described analog predistortion corrective system of output signal coupling input with described radio-frequency power amplifier;
Described analog predistortion corrective system is used to receive the part of the input signal of described radio-frequency power amplifier, with the input signal of the described radio-frequency power amplifier part by the described first coupler coupled signal as first signal, with the input signal of the described radio-frequency power amplifier remaining part by the described first coupler coupled signal as secondary signal, the output signal of the described radio-frequency power amplifier that receives with described first signal cancellation, obtain distorted signal, afterwards, detect the size of described distorted signal, and, described secondary signal is carried out the pre-distortion of respective strengths according to the size of detected described distorted signal;
Second coupler is used for importing described radio-frequency power amplifier after the remaining part coupling of the input signal of secondary signal after the described pre-distortion system handles and described radio-frequency power amplifier.
2. radio frequency power amplifying device as claimed in claim 1 is characterized in that, described radio frequency power amplifying device also comprises:
Be connected in first balanced to unbalanced transformer between described first coupler and the described analog predistortion corrective system.
3. radio frequency power amplifying device as claimed in claim 2 is characterized in that, described radio frequency power amplifying device also comprises first amplitude modulator that connects described first coupler.
4. radio frequency power amplifying device as claimed in claim 1 is characterized in that, described radio frequency power amplifying device also comprises:
Be connected in second balanced to unbalanced transformer between described the 3rd coupler and the described analog predistortion corrective system.
5. radio frequency power amplifying device as claimed in claim 4 is characterized in that described radio frequency power amplifying device also comprises second amplitude modulator, and described the 3rd coupler connects described second balanced to unbalanced transformer by described second amplitude modulator.
6. radio frequency power amplifying device as claimed in claim 1 is characterized in that, described radio frequency power amplifying device also comprises:
Be connected in the 3rd balanced to unbalanced transformer between described second coupler and the described analog predistortion corrective system.
7. radio frequency power amplifying device as claimed in claim 1, it is characterized in that, described first coupler is connected with described second coupler by a line of time delay, and the error in length scope of described line of time delay is the length that the described input signal of described radio-frequency power amplifier is propagated in one-period.
8. as each described radio frequency power amplifying device of claim 1 to 7, it is characterized in that described radio-frequency power amplifier is selected the power amplifier based on the Doherty technology for use.
9. the analog predistortion correction method as each described radio frequency power amplifying device of claim 1 to 7 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 described radio-frequency power amplifier;
The analog predistortion corrective system receives the part of the input signal of described radio-frequency power amplifier, with the input signal of the described radio-frequency power amplifier part by the described first coupler coupled signal as first signal, with the input signal of the described radio-frequency power amplifier remaining part by the described first coupler coupled signal as secondary signal, output signal with the described radio-frequency power amplifier of described first signal cancellation, obtain distorted signal, detect the size of described distorted signal afterwards, and according to the size of detected described distorted signal, described secondary signal is carried out the pre-distortion of respective strengths, the described secondary signal of second coupler after and the described radio-frequency power amplifier of remaining part coupling input of the input signal of described radio-frequency power amplifier with pre-distortion.
10. the analog predistortion correction method of radio frequency power amplifying device as claimed in claim 9 is characterized in that, described radio-frequency power amplifier is selected the power amplifier based on the Doherty technology for use.
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| CN2010101373415A CN101807886B (en) | 2010-03-26 | 2010-03-26 | Radio frequency power amplifying device and analog predistortion correction method thereof |
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| CN2010101373415A CN101807886B (en) | 2010-03-26 | 2010-03-26 | Radio frequency power amplifying device and analog predistortion correction method thereof |
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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 |
| WO2016154933A1 (en) * | 2015-03-31 | 2016-10-06 | 华为技术有限公司 | Digital pre-distortion correcting method and device |
| WO2016191993A1 (en) * | 2015-05-30 | 2016-12-08 | 华为技术有限公司 | Analog pre-distortion (apd) correction system and 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 |
| CN111200404A (en) * | 2018-11-16 | 2020-05-26 | 财团法人工业技术研究院 | Linearity improving system and linearity improving method |
| CN113472299A (en) * | 2020-03-30 | 2021-10-01 | 大唐移动通信设备有限公司 | Signal receiving and transmitting front-end circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| CN113472299A (en) * | 2020-03-30 | 2021-10-01 | 大唐移动通信设备有限公司 | Signal receiving and transmitting front-end circuit |
| 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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|---|---|
| CN101807886B (en) | 2012-08-08 |
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