WO2013097354A1 - Circuit de protection et procédé de protection pour amplificateur de puissance - Google Patents

Circuit de protection et procédé de protection pour amplificateur de puissance Download PDF

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Publication number
WO2013097354A1
WO2013097354A1 PCT/CN2012/072371 CN2012072371W WO2013097354A1 WO 2013097354 A1 WO2013097354 A1 WO 2013097354A1 CN 2012072371 W CN2012072371 W CN 2012072371W WO 2013097354 A1 WO2013097354 A1 WO 2013097354A1
Authority
WO
WIPO (PCT)
Prior art keywords
power amplifier
filter
pass filter
band
band pass
Prior art date
Application number
PCT/CN2012/072371
Other languages
English (en)
Chinese (zh)
Inventor
何钢
刘沛玮
杨帆
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
Priority claimed from CN201110453038.0A external-priority patent/CN103187933B/zh
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
Publication of WO2013097354A1 publication Critical patent/WO2013097354A1/fr

Links

Classifications

    • 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
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only

Definitions

  • the present invention relates to the field of communications, and in particular, to a protection circuit and a protection method for a power amplifier.
  • the power amplifier will not only suffer damage to the power amplifier module, but also the base station where it is located.
  • the simplified structure of the conventional power amplifier is shown in Figure 1.
  • the RF signal is amplified by the power amplifier and output.
  • the power amplifier has a gradual impedance, a lower Q value, a slower in-band-to-band transition, and a higher out-of-band gain, so the out-of-band signal can cause serious mismatch of the power amplifier and damage.
  • LDMOS laterally diffused metal oxide semiconductor
  • GaN gallium nitride
  • GaAs gallium arsenide
  • pHEMT high electron mobility transistors
  • Embodiments of the present invention provide a protection circuit and a protection method for a power amplifier to prevent damage to a power amplifier caused by an out-of-band signal or an abnormal wideband signal.
  • the present invention uses the following technical solutions:
  • a protection circuit for a power amplifier comprising a power amplifier, the input end of the power amplifier being connected to an input end of the radio frequency signal
  • the protection circuit further comprises a band pass filter, wherein the band pass filter is located at the radio frequency signal An input terminal and an input of the power amplifier; a center frequency of the band pass filter being a center frequency of an operating band of the power amplifier, the band pass filtering
  • the operating bandwidth of the device is greater than the operating bandwidth of the power amplifier.
  • the band pass filter is a cavity filter, a dielectric filter, a microstrip filter, a ceramic filter or a lumped element (LC) filter.
  • the power amplifier is a single-tube power amplifier or a power amplification module.
  • the power amplification module comprises a balanced class AB amplifier, a Doherty power amplifier, and a power amplifier system comprising a plurality of power amplifiers in series and parallel.
  • a method for protecting a power amplifier comprising: connecting an input end of the radio frequency signal to an input end of the band pass filter;
  • a center frequency of the band pass filter is the same as a center frequency of the power amplifier, and an operating bandwidth of the band pass filter is greater than an operating bandwidth of the power amplifier.
  • the band pass filter is a cavity filter, a dielectric filter, a microstrip filter, a ceramic filter or a lumped element (LC) filter.
  • the power amplifier is a single-tube power amplifier or a power amplification module.
  • the power amplification module comprises a balanced class AB amplifier, a Doherty power amplifier, and a power amplifier system comprising a plurality of power amplifiers in series and parallel.
  • the protection circuit and the protection method of the above power amplifier by providing a band pass filter at the input end of the power amplifier, effectively prevent the power amplifier from being damaged by an out-of-band signal or an abnormal wide-band signal.
  • 1 is a schematic structural view of a power amplifier
  • FIG. 2 is a schematic structural diagram of a power amplifier protection circuit according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a power amplifier protection circuit according to an embodiment of the present invention.
  • the circuit is different from the circuit shown in FIG. 1 in that: a signal is added between the input end of the RF signal and the input end of the power amplifier.
  • Bandpass filter the bandwidth of the bandpass filter is appropriately extended over the operating bandwidth of the power amplifier; the bandpass filter can be largely used when the input generates an out-of-band signal or becomes a wide-bandwidth wideband signal.
  • the out-of-band anomaly signal is attenuated and filtered out to prevent the power amplifier from being damaged due to in-band matching mismatch or excessive input power.
  • the center frequency of the band pass filter may be a center frequency of an operating band of the power amplifier, and an operating bandwidth of the band pass filter is greater than an operating bandwidth of the power amplifier.
  • the band pass filter in the circuit may be a cavity filter, a dielectric filter, a microstrip filter, a ceramic filter, a lumped element (LC) filter, etc., according to actual needs, such as size, insertion loss, etc. Request to use.
  • LC lumped element
  • the power amplifier in the above circuit may be a single-tube power amplifier or a power amplifying module, such as a balanced class AB amplifier, a Doherty power amplifier, a power amplifier system composed of a plurality of power amplifiers in series and parallel, and the like. .
  • the protection circuit of the above power amplifier can filter out an out-of-band signal or a wide-bandwidth abnormal wide-band signal (such as a signal extending beyond the operating band of the power amplifier design) when the input signal is abnormally generated. Excessive extra-band signals are avoided to prevent the power amplifier from being damaged due to in-band matching mismatch or excessive input power.
  • the above circuit is simple in structure, easy to implement, high in reliability, and can effectively protect the power amplifier, and is assisted by simulation software. Can be applied to a variety of RF applications.
  • An embodiment of the present invention provides a method for protecting a power amplifier, the method comprising: Step 1: connecting an input end of the radio frequency signal to an input end of the band pass filter;
  • Step 2 Connect an output end of the band pass filter to an input end of the power amplifier.
  • the band pass filter may be a cavity filter, a dielectric filter, a microstrip filter, a ceramic filter or an LC filter, etc.
  • the power amplifier may be a single tube power amplifier or a power amplification module, and the power amplification module It includes balanced class AB amplifiers, Doherty power amplifiers, and power amplifier systems consisting of multiple power amplifiers in series and parallel.
  • the protection method of the above power amplifier can filter out the extra-band unwanted signal through the band-pass filter when the input signal is abnormally generated to generate an out-of-band signal or an abnormal wide-band signal with a wide bandwidth, thereby avoiding the power amplifier due to in-band matching mismatch. Or the input power is too large and damaged.
  • the protection circuit and the protection method of the above power amplifier by providing a band pass filter at the input end of the power amplifier, effectively prevent the power amplifier from being damaged by an out-of-band signal or an abnormal wide-band signal. Therefore, the present invention has strong industrial applicability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Microwave Amplifiers (AREA)

Abstract

L'invention concerne un circuit de protection et un procédé de protection pour un amplificateur de puissance. Le circuit de protection comprend l'amplificateur de puissance. Une borne d'entrée de l'amplificateur de puissance est connectée à une borne d'entrée d'un signal de radiofréquences. Le circuit comprend également un filtre passe-bande. Le filtre passe-bande est disposé entre la borne d'entrée du signal de radiofréquences et la borne d'entrée de l'amplificateur de puissance. La fréquence centrale du filtre passe-bande est la fréquence centrale de la bande de fréquences de fonctionnement de l'amplificateur de puissance, et la largeur de bande de fonctionnement du filtre passe-bande est supérieure à celle de l'amplificateur de puissance. Par placement du filtre passe-bande à l'entrée de l'amplificateur de puissance, cette solution évite efficacement que l'amplificateur de puissance soit endommagé à cause des impacts d'un signal hors bande ou d'un signal anormal à large bande.
PCT/CN2012/072371 2011-12-30 2012-03-15 Circuit de protection et procédé de protection pour amplificateur de puissance WO2013097354A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110453038.0 2011-12-30
CN201110453038.0A CN103187933B (zh) 2011-12-30 功率放大器的保护电路和保护方法

Publications (1)

Publication Number Publication Date
WO2013097354A1 true WO2013097354A1 (fr) 2013-07-04

Family

ID=48678923

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/072371 WO2013097354A1 (fr) 2011-12-30 2012-03-15 Circuit de protection et procédé de protection pour amplificateur de puissance

Country Status (1)

Country Link
WO (1) WO2013097354A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113114288A (zh) * 2021-05-21 2021-07-13 中国电子科技集团公司第二十九研究所 一种大功率发射机功率陷波方法和陷波组件

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1169066A (zh) * 1996-03-27 1997-12-31 松下电器产业株式会社 无线电接收装置
CN1174450A (zh) * 1996-06-25 1998-02-25 哈里公司 将数字通信信号直接上变频为模拟if输出的方法和装置
CN102006127A (zh) * 2010-10-28 2011-04-06 中国电子科技集团公司第五十四研究所 可重组信号源平台

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1169066A (zh) * 1996-03-27 1997-12-31 松下电器产业株式会社 无线电接收装置
CN1174450A (zh) * 1996-06-25 1998-02-25 哈里公司 将数字通信信号直接上变频为模拟if输出的方法和装置
CN102006127A (zh) * 2010-10-28 2011-04-06 中国电子科技集团公司第五十四研究所 可重组信号源平台

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113114288A (zh) * 2021-05-21 2021-07-13 中国电子科技集团公司第二十九研究所 一种大功率发射机功率陷波方法和陷波组件

Also Published As

Publication number Publication date
CN103187933A (zh) 2013-07-03

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