WO2010075645A1 - Procédé et dispositif d'amélioration de la linéarité d'un amplificateur de puissance à radiofréquence - Google Patents

Procédé et dispositif d'amélioration de la linéarité d'un amplificateur de puissance à radiofréquence Download PDF

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Publication number
WO2010075645A1
WO2010075645A1 PCT/CN2008/002164 CN2008002164W WO2010075645A1 WO 2010075645 A1 WO2010075645 A1 WO 2010075645A1 CN 2008002164 W CN2008002164 W CN 2008002164W WO 2010075645 A1 WO2010075645 A1 WO 2010075645A1
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WO
WIPO (PCT)
Prior art keywords
power amplifier
signal
radio frequency
input
final stage
Prior art date
Application number
PCT/CN2008/002164
Other languages
English (en)
Chinese (zh)
Inventor
朱国斌
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to PCT/CN2008/002164 priority Critical patent/WO2010075645A1/fr
Publication of WO2010075645A1 publication Critical patent/WO2010075645A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
    • H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
    • H04L27/368—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion adaptive predistortion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3276—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using the nonlinearity inherent to components, e.g. a diode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for improving the linearity of a high power final stage power amplifier circuit and a high power user terminal equipment (CPE) RF power amplifier of a communication base station.
  • CPE user terminal equipment
  • WiMAX CPE combines the latest 3G technology to provide user voice and data services using Voice over Internet Protocol (VoIP).
  • VoIP Voice over Internet Protocol
  • the WiMAX signal amplification of the transmit channel generally uses a high-gain integrated power amplifier, or uses a multi-stage power amplifier link and the final stage power amplifier uses power back-off technology to improve the RF output linearity.
  • the integrated power amplifier is the preferred solution, but the integrated power amplifier has high cost, few equipment suppliers or even the problem of exclusive supply (currently only Mitsubishi Semiconductor has related devices), and the device characteristics are affected by the product application range. Limited and poorly flexible. Power backoff technology is currently the solution of most equipment providers, but this solution requires higher power capacity of the final stage power amplifier (because WiMAX signals have higher peak-to-average ratio and large dynamic range), thus causing device linearity. Low degree, small dynamic range, high price, low efficiency, large size and increased design difficulty.
  • the technical problem to be solved by the present invention is to provide an apparatus and method for improving the linearity of a radio frequency power amplifier to compensate and improve the linearity of the final stage power amplifier.
  • the present invention provides an apparatus for improving the linearity of a radio frequency power amplifier, including a final stage power amplifier, wherein:
  • a predistortion circuit including an output of the predistortion circuit and the final stage power amplifier
  • the input terminals are connected for phase shifting the input signal according to the input signal amplitude of the final stage power amplifier - the nonlinear distortion of the output signal phase to compensate for the nonlinear distortion.
  • the above device may also have the following features, and the predistortion circuit is a diode pre-distortion circuit.
  • the above device may also have the following features.
  • the diode predistortion circuit includes a 3dB quadrature coupler and a varactor phase shifting circuit, or a circulator and a varactor, or a circulator and a PIN diode.
  • the above device may also have the following features.
  • the diode predistortion circuit includes a 3dB quadrature coupler and a varactor phase shifting circuit, wherein the 3dB quadrature coupler includes an input port, an output port, and two internals connected to the varactor phase shifting circuit Port, the varactor phase shifting circuit comprises two varactor diodes, the negative poles of which are connected to ground, the positive poles are connected to a DC voltage, and respectively pass through a capacitor and an internal of the 3dB quadrature coupler The ports are connected.
  • the above device may further have the following features, the device further comprising a driving power amplifier, the output of the driving power amplifier being connected to the input end of the predistortion circuit.
  • the above device may also have the following features.
  • the device is a radio frequency signal transmitting device, and further comprises a fixed attenuator whose output is connected to the input end of the driving power amplifier, a balun filter connected to the fixed attenuator input, an input terminal and the final stage power amplifier A low pass filter connected to the output, and an RF switch connected to the low pass filter at the input end.
  • the above device may further have the following features: the device is a radio frequency signal transmitting device in a base station or a user terminal device, and the predistortion circuit is configured to phase shift the input radio frequency signal.
  • the present invention also provides a method for improving the linearity of a radio frequency power amplifier, including:
  • the signal Before the signal is input to the final stage RF power amplifier, the signal is phase-shifted according to the input signal amplitude of the final stage power amplifier - the nonlinear distortion of the output signal phase to compensate for the nonlinear distortion. Further, the above method may also have the following features.
  • the diode pre-distortion circuit is used to phase shift the RF signal.
  • the diode predistortion circuit includes a 3dB quadrature coupler and a varactor phase shift circuit.
  • the above method may also have the following features.
  • the final stage radio frequency power amplifier is located in a radio frequency signal transmitting device in a base station or a user terminal device, and the signal is a radio frequency signal.
  • the method of the invention minimizes the cost of the corresponding device such as WiMAX CPE and the design difficulty of the CPE product, and improves the overall launch performance of the corresponding device such as WiMAX CPE, such as improving the linearity of the whole machine of the WiMAX CPE and Dynamic range, reduced power consumption and low heat generation;
  • this design scheme reduces the volume of corresponding products in CPE or base station, is not limited by exclusive supply, can make full use of selectable general-purpose devices, and increase the usable frequency band. Selectivity thus limits the frequency band. ⁇ Use a power amplifier with a smaller power rating to reduce costs and improve cost performance.
  • FIG. 1 is a schematic structural diagram of a prior art WiMAX signal processing module
  • FIG. 2 is a schematic structural diagram of a WiMAX radio frequency signal transmission channel according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a diode predistortion circuit according to an embodiment of the present invention.
  • the present invention provides a predistortion process prior to the final stage general purpose power amplifier to phase shift the input RF signal of the final stage power amplifier to compensate for and improve the linearity and dynamic range of the final stage power amplifier.
  • the schematic diagram of the WiMAX signal processing module is shown in FIG. 1 , and includes a baseband processor 101 , a radio frequency processor 102 , a WiMAX radio frequency signal receiving channel 103 , and a WiMAX radio frequency signal transmission channel .
  • a baseband processor and a radio frequency processor of BECEEM are used, wherein:
  • the baseband processor 101 When transmitting, the baseband processor 101 modulates the baseband digital signal into a WiMAX modulated analog low frequency signal output to the RF processor 102.
  • the RF processor 102 converts the WiMAX modulated analog low frequency signal to the desired RF operating frequency band to generate a WiMAX modulated RF.
  • the signal is sent to the WiMAX radio frequency signal transmission channel 104, and the WiMAX radio frequency signal transmission channel 104 is responsible for processing the WiMAX modulated radio frequency signal and radiating it to the free space through the antenna;
  • the WiMAX RF signal receiving channel 103 Upon receiving, the WiMAX RF signal receiving channel 103 is responsible for receiving and filtering the WiMAX RF receiving signal, and transmitting the filtered WiMAX RF receiving signal to the RF processor 102.
  • the RF processor 102 converts the WiMAX RF receiving signal to an analog low frequency signal and outputs To the baseband processor 101, the baseband processor 101 demodulates the analog low frequency signal to a baseband digital signal.
  • the structure diagram of the WiMAX radio frequency signal transmission channel 104 is as shown in FIG. 2, and includes a balun filter 201 (BALU FILTER), a fixed attenuator 202, a driving power amplifier 203, a diode predistortion circuit 204, and a final stage power.
  • the stage power amplifier can be a general-purpose low-gain power amplifier; the RF switch can be a combined single-Pole Double-Throw (SPDT) RF switch.
  • the diode predistortion circuit 204 therein is added in this embodiment.
  • the diode predistortion circuit 204 includes a 3dB quadrature coupler and a varactor phase shift circuit, as shown in FIG.
  • the 3dB quadrature coupler has four ports.
  • the varactor phase shifting circuit consists of two varactor diodes. The negative poles of the two varactor diodes are connected to ground. The positive poles are connected to the DC voltage and pass through a capacitor and 3dB positive respectively. Port 3 of the AC coupler is connected to Port 4.
  • the RF signal is input through the 3dB quadrature coupler port 1, it is divided into two channels and transmitted to two varactor diodes connected through the capacitor.
  • the phase shift of the varactor diode the phase of the RF signal changes, and finally the reflected signal after the phase change.
  • the port 2 of the 3dB coupler is remixed and output together.
  • a diode predistortion circuit including a 3dB quadrature coupler and a varactor phase shifting circuit indirectly adjusts the PN junction capacitance of the diode by adjusting a bias DC voltage external to the varactor to indirectly shift the RF signal to compensate for the end.
  • Amplitude and phase distortion (AM-PM) of a stage power amplifier Linearity and dynamic range of high final power amplifier devices.
  • the diode predistortion circuit can also use a circulator plus a varactor diode, or a circulator plus
  • the balun filter 201 After the WiMAX radio frequency signal transmitting channel 104 receives the WiMAX modulated radio frequency signal transmitted by the radio frequency processor 102, the balun filter 201 generates a radio frequency transmitting signal that is balanced to unbalanced and filtered to remove out-of-band clutter, and Transmission to the fixed attenuator 202, in order to prevent the input port mismatch of the driving power amplifier 203 from affecting the passband characteristics of the balun filter 201, the fixed attenuator 202 is used to fixedly attenuate the radio frequency transmitting signal to improve the preamplifier.
  • the input of the driver stage is matched, and the attenuated RF transmission signal is transmitted to a driving power amplifier 203, which may be a medium power high gain power amplifier, and the driving power amplifier 203 amplifies the RF emission signal to a desired level and linearity.
  • the second stage is transmitted to the diode predistortion circuit 204.
  • the diode predistortion circuit 204 indirectly shifts the RF signal by adjusting the bias DC voltage outside the varactor to change the PN junction capacitance of the diode and transmits it to the final stage power amplifier 205.
  • a low-pass filter 206, low-pass filters 206 filter out the higher harmonics emitted after RF signal 207 by RF switch transmits a combined signal of the RF transceiver to the antenna, the antenna transmitting the radio frequency signal is radiated into free space.
  • a diode predistortion circuit is added between the driving power amplifier of the WiMAX radio frequency signal transmitting channel and the final stage power amplifier, and the diode predistortion circuit mainly plays a phase shifting effect on the input radio frequency signal.
  • the final stage power amplifier is a nonlinear device, there is very large nonlinear distortion in high power applications, including input signal amplitude-output signal amplitude (AM-AM) distortion and input signal amplitude-output signal phase (AM- PM) distortion (as shown in Figure 4).
  • the role of the diode predistortion circuit is to phase shift the input signal to reduce AM-PM distortion.
  • the input signal enters the 3dB coupler and is split into two.
  • the two ports of the coupler are connected to varactor diodes (assumed to be ideal reactance components, only phase shifting), which is changed by adjusting the reverse bias voltage of the varactor.
  • the PN junction capacitance causes the phase of the RF signal to change.
  • the reflected signal after the phase change is remixed and output at the output port.
  • the reflected signal arrives at the input port 180. Inverted, so they can cancel each other out.
  • the present invention can also be applied to a high-power final-stage power amplifier circuit of a communication base station, such as a repeater, Global System For Mobile Communication (GSM), and code division multiple access (Code-Division). Multiple Access, CDMA), Wideband-CDMA (WCDMA), WiMAX, Long Term Evolution (LTE) and other base station power amplifier circuits and high-power CPE terminal products of the above communication systems.
  • GSM Global System For Mobile Communication
  • Code-Division Code division multiple access
  • the present invention can improve the linearity of a high power final stage power amplifier circuit and a high power user terminal equipment (CPE) RF power amplifier of a communication base station.
  • CPE user terminal equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne un dispositif d'amélioration de la linéarité d'un amplificateur de puissance à radiofréquence, ledit dispositif comprenant un amplificateur de puissance d'étage final et un circuit de pré-distorsion. Le côté sortie du circuit de pré-distorsion est couplée au côté entrée de l'amplificateur de puissance d'étage final afin d'appliquer un déphasage au le signal d'entrée en fonction de la distorsion non linéaire de l'amplitude du signal d'entrée / de la phase du signal de sortie de l'amplificateur de puissance d'étage final, en vue de compenser la distorsion non linéaire. En conséquence, la présente invention concerne également un procédé d'amélioration de la linéarité d'un amplificateur de puissance à radiofréquence. Avant que le signal soit introduit dans l'amplificateur de puissance d'étage final à radiofréquence, le déphasage est d'abord appliqué au signal afin de compenser la distorsion non linéaire, en fonction de la distorsion non linéaire de l'amplitude du signal d'entrée / de la phase du signal de sortie de l'amplificateur de puissance d'étage final. Le procédé selon la présente invention réduit le coût et la difficulté de conception de dispositifs apparentés comme des CPE WiMAX, améliore la linéarité d'émission et la dynamique de la machine dans son ensemble, et réduit la dissipation d'énergie. En outre, la puissance calorifique est faible.
PCT/CN2008/002164 2008-12-31 2008-12-31 Procédé et dispositif d'amélioration de la linéarité d'un amplificateur de puissance à radiofréquence WO2010075645A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2008/002164 WO2010075645A1 (fr) 2008-12-31 2008-12-31 Procédé et dispositif d'amélioration de la linéarité d'un amplificateur de puissance à radiofréquence

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PCT/CN2008/002164 WO2010075645A1 (fr) 2008-12-31 2008-12-31 Procédé et dispositif d'amélioration de la linéarité d'un amplificateur de puissance à radiofréquence

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106254297A (zh) * 2016-08-31 2016-12-21 浙江嘉科电子有限公司 一种矢量调制器
CN111200404A (zh) * 2018-11-16 2020-05-26 财团法人工业技术研究院 线性度改善系统及线性度改善方法
CN112202477A (zh) * 2020-09-30 2021-01-08 苏州希格玛科技有限公司 一种4g无线传输rfid读写系统
CN112332788A (zh) * 2020-10-22 2021-02-05 浙江三维利普维网络有限公司 一种射频功放模块

Citations (4)

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Publication number Priority date Publication date Assignee Title
CN1384602A (zh) * 2001-05-08 2002-12-11 华为技术有限公司 自适应射频数字预失真线性化方法及其电路
CN1585264A (zh) * 2003-08-22 2005-02-23 华为技术有限公司 一种功放系统及其产生预失真信号的方法
CN1964213A (zh) * 2006-12-13 2007-05-16 北京中星微电子有限公司 一种提高射频功率放大器线性度的方法、系统和基带
CN101027836A (zh) * 2002-07-03 2007-08-29 皇家菲利浦电子有限公司 改进的线性功率放大器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1384602A (zh) * 2001-05-08 2002-12-11 华为技术有限公司 自适应射频数字预失真线性化方法及其电路
CN101027836A (zh) * 2002-07-03 2007-08-29 皇家菲利浦电子有限公司 改进的线性功率放大器
CN1585264A (zh) * 2003-08-22 2005-02-23 华为技术有限公司 一种功放系统及其产生预失真信号的方法
CN1964213A (zh) * 2006-12-13 2007-05-16 北京中星微电子有限公司 一种提高射频功率放大器线性度的方法、系统和基带

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106254297A (zh) * 2016-08-31 2016-12-21 浙江嘉科电子有限公司 一种矢量调制器
CN106254297B (zh) * 2016-08-31 2023-11-28 浙江嘉科电子有限公司 一种矢量调制器
CN111200404A (zh) * 2018-11-16 2020-05-26 财团法人工业技术研究院 线性度改善系统及线性度改善方法
CN112202477A (zh) * 2020-09-30 2021-01-08 苏州希格玛科技有限公司 一种4g无线传输rfid读写系统
CN112332788A (zh) * 2020-10-22 2021-02-05 浙江三维利普维网络有限公司 一种射频功放模块

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