WO2013097354A1 - Protection circuit and protection method for power amplifier - Google Patents

Protection circuit and protection method for power amplifier 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
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Prior art keywords
power amplifier
filter
pass filter
band
band pass
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PCT/CN2012/072371
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French (fr)
Chinese (zh)
Inventor
何钢
刘沛玮
杨帆
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中兴通讯股份有限公司
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Priority claimed from CN201110453038.0A external-priority patent/CN103187933B/en
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/en

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    • 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.

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

Abstract

Disclosed are a protection circuit and a protection method for a power amplifier. The protection circuit comprises the power amplifier. An input-end of the power amplifier is connected to an input-end for a radiofrequency signal. The circuit also comprises a band-pass filter. The band-pass filter is arranged between the input-end for the radiofrequency signal and the input-end of the power amplifier. The center frequency of the band-pass filter is the center frequency of the operating frequency band of the power amplifier, where the operating bandwidth of the band-pass filter is greater than the operating bandwidth of the power amplifier. By arranging the band-pass filter at the input-end of the power amplifier, the solution effectively prevents the power amplifier from damages due to impacts by an out-of-band signal or an irregular broadband signal.

Description

功率放大器的保护电路和保护方法  Power amplifier protection circuit and protection method
技术领域 Technical field
本发明涉及通讯领域，尤其涉及一种功率放大器的保护电路和保护方法。  The present invention relates to the field of communications, and in particular, to a protection circuit and a protection method for a power amplifier.
背景技术 Background technique
目前日益激烈的市场竟争对基站产品的稳定性提出了很高的要求， 功率 放大器作为基站的重要组成部分 ,一旦失效 ,不但功率放大模块会受到损坏， 其所在的基站也不能正常工作。 传统的功率放大器简化电路结构如图 1所示， 射频信号通过功率放大器 放大后输出。 功率放大器阻抗渐变， Q值较低， 带内到带外过渡较慢， 带外 增益较高， 因此带外信号会引起功率放大器严重失配从而损坏。 对于目前各 种类型的功放管（例如， 横向扩散金属氧化物半导体（LDMOS )管、 氮化镓 ( GaN ) 、 砷化镓（GaAs )赝高电子迁移率晶体管（ pHEMT )等）来说， 宽 带输入信号带宽越宽时， 越容易造成功率放大器损坏。 特别是当系统输入异 常， 产生大功率带外信号或带宽很宽的异常宽带信号 （如带宽扩展到功率放 大器设计的工作频带之外的信号） 时， 功率放大器更容易因此而受到损坏。  At present, the increasingly fierce market competition puts high demands on the stability of base station products. As an important part of the base station, 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. For various types of power amplifier tubes (for example, laterally diffused metal oxide semiconductor (LDMOS) tubes, gallium nitride (GaN), gallium arsenide (GaAs), high electron mobility transistors (pHEMT), etc., broadband The wider the input signal bandwidth, the more likely the power amplifier is damaged. Especially when the system input is abnormal and a high-power out-of-band signal or a wide bandwidth abnormal broadband signal (such as a signal extending beyond the operating band of the power amplifier design) is generated, the power amplifier is more susceptible to damage.
因此， 为了防止带外信号或异常宽带信号对功率放大器造成损坏， 设计 一种功率放大器的保护电路具有重要的意义。  Therefore, in order to prevent the out-of-band signal or abnormal broadband signal from damaging the power amplifier, it is important to design a protection circuit for the power amplifier.
发明内容 Summary of the invention
本发明实施例提供了一种功率放大器的保护电路和保护方法， 以防止带 外信号或异常宽带信号对功率放大器造成损坏。  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.
为解决上述技术问题， 本发明釆用如下技术方案：  In order to solve the above technical problems, the present invention uses the following technical solutions:
一种功率放大器的保护电路， 包括功率放大器， 该功率放大器的输入端 与射频信号的输入端相连， 其中： 该保护电路还包括带通滤波器， 所述带通 滤波器位于所述射频信号的输入端和所述功率放大器的输入端之间； 所述带 通滤波器的中心频率为所述功率放大器工作频带的中心频率， 所述带通滤波 器的工作带宽大于所述功率放大器的工作带宽。 其中： 所述带通滤波器为腔体滤波器、 介质滤波器、 微带滤波器、 陶瓷 滤波器或集总元件（LC )滤波器。 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, wherein: 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. Wherein: the band pass filter is a cavity filter, a dielectric filter, a microstrip filter, a ceramic filter or a lumped element (LC) filter.
其中： 所述功率放大器为单管功率放大器或功率放大模块。  Wherein: the power amplifier is a single-tube power amplifier or a power amplification module.
其中： 所述功率放大模块包括平衡式 AB类放大器、 道赫蒂（Doherty ) 功率放大器以及多个功率放大器串并联所构成的功放系统。  Wherein: 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.
一种功率放大器的保护方法， 该保护方法包括： 将射频信号输入端与带通滤波器的输入端相连；  A method for protecting a power amplifier, the protection method comprising: connecting an input end of the radio frequency signal to an input end of the band pass filter;
将所述带通滤波器的输出端与所述功率放大器的输入端相连；  Connecting an output of the band pass filter to an input of the power amplifier;
其中， 所述带通滤波器的中心频率与所述功率放大器的中心频率相同， 所述带通滤波器的工作带宽大于所述功率放大器的工作带宽。  Wherein, 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.
其中： 所述带通滤波器为腔体滤波器、 介质滤波器、 微带滤波器、 陶瓷 滤波器或集总元件（LC )滤波器。  Wherein: the band pass filter is a cavity filter, a dielectric filter, a microstrip filter, a ceramic filter or a lumped element (LC) filter.
其中： 所述功率放大器为单管功率放大器或功率放大模块。  Wherein: the power amplifier is a single-tube power amplifier or a power amplification module.
其中： 所述功率放大模块包括平衡式 AB类放大器、 道赫蒂（Doherty ) 功率放大器以及多个功率放大器串并联所构成的功放系统。  Wherein: 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.
上述功率放大器的保护电路和保护方法， 通过在功率放大器输入端设置 了带通滤波器， 有效防止了功率放大器受带外信号或异常宽带信号影响而造 成的损坏。 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.
附图概述 BRIEF abstract
图 1为功率放大器的结构示意图；  1 is a schematic structural view of a power amplifier;
图 2为本发明实施例的功率放大器保护电路的结构示意图。  2 is a schematic structural diagram of a power amplifier protection circuit according to an embodiment of the present invention.
本发明的较佳实施方式 Preferred embodiment of the invention
为使本发明的目的、 技术方案和优点更加清楚明白， 下文中将结合附图 对本发明的实施例进行详细说明。 需要说明的是， 在不冲突的情况下， 本申 请中的实施例及实施例中的特征可以相互任意组合。 In order to make the objects, technical solutions and advantages of the present invention more clear, the following will be combined with the accompanying drawings. The embodiments of the present invention will be described in detail. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.
如图 2所示， 为本发明实施例的功率放大器保护电路结构示意图， 该电 路与图 1所示电路相比， 不同之处在于： 在射频信号输入端和功率放大器的 输入端之间添加一个带通滤波器， 该带通滤波器的工作带宽在功率放大器工 作带宽上适当扩展； 当输入发生异常产生带外信号或变为带宽很宽的宽带信 号时， 带通滤波器可以在很大程度上削弱并滤除掉带外异常信号， 避免功率 放大器因带内匹配失配或输入功率过大而损坏。  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.
其中， 上述带通滤波器的中心频率可以为所述功率放大器工作频带的中 心频率， 所述带通滤波器的工作带宽大于所述功率放大器的工作带宽。  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.
其中， 该电路中的带通滤波器可以是腔体滤波器、 介质滤波器、 微带滤 波器、 陶瓷滤波器、 集总元件（LC )滤波器等， 根据实际需要， 如尺寸、 插 损等要求选取使用。  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.
上述电路中的功率放大器可以是一个单管功率放大器， 也可以是一个功 率放大模块， 如平衡式 AB类放大器、 道赫蒂（Doherty )功率放大器、 多个 功率放大器串并联所构成的功放系统等。  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. .
上述功率放大器的保护电路， 可以在输入信号发生异常产生带外信号或 者带宽很宽的异常宽带信号 （如带宽扩展到功率放大器设计的工作频带之外 的信号） 时， 通过带通滤波器滤除掉带外多余的信号， 避免功率放大器因带 内匹配失配或输入功率过大而损坏； 另外， 上述电路结构简单， 易于实现， 可靠性高， 能有效保护功率放大器， 通过仿真软件的辅助设计能够将其应用 于多种射频场合。  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. In addition, 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.
本发明实施例提供了一种功率放大器的保护方法， 该方法包括： 步骤一、 将射频信号输入端与带通滤波器的输入端相连； 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;
其中， 所述带通滤波器的中心频率与所述功率放大器的中心频率相同， 所述带通滤波器的工作带宽大于所述功率放大器的工作带宽； 且该带通滤波 器相关参数的设计过程可以通过仿真软件来辅助实现。 步骤二、 将所述带通滤波器的输出端与所述功率放大器的输入端相连。 所述带通滤波器可以为腔体滤波器、 介质滤波器、 微带滤波器、 陶瓷滤 波器或 LC滤波器等； 上述功率放大器可以为单管功率放大器或功率放大模 块， 而功率放大模块又包括平衡式 AB类放大器、 Doherty功率放大器以及多 个功率放大器串并联所构成的功放系统等。 Wherein the center frequency of the band pass filter is the same as the center frequency of the power amplifier, the working bandwidth of the band pass filter is greater than the operating bandwidth of the power amplifier; and the design process of the related parameters of the band pass filter It can be assisted by simulation software. 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.
上述功率放大器的保护方法， 可以在输入信号发生异常产生带外信号或 者带宽很宽的异常宽带信号时， 通过带通滤波器滤除掉带外多余的信号， 避 免功率放大器因带内匹配失配或输入功率过大而损坏。  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.
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 上述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。 One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program that instructs the associated hardware to be stored in a computer readable storage medium, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.
以上实施例仅用以说明本发明的技术方案而非限制， 仅仅参照较佳实施 例对本发明进行了详细说明。 本领域的普通技术人员应当理解， 可以对本发 明的技术方案进行修改或者等同替换， 而不脱离本发明技术方案的精神和范 围， 均应涵盖在本发明的权利要求范围当中。  The above embodiments are only intended to illustrate the technical solutions of the present invention and are not to be construed as limiting the invention. It should be understood by those skilled in the art that the present invention may be modified or equivalently substituted without departing from the spirit and scope of the invention.
工业实用性 Industrial applicability
上述功率放大器的保护电路和保护方法， 通过在功率放大器输入端设置 了带通滤波器， 有效防止了功率放大器受带外信号或异常宽带信号影响而造 成的损坏。 因此本发明具有很强的工业实用性。  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.

Claims

权 利 要 求 书 Claim
1、 一种功率放大器的保护电路， 包括功率放大器， 该功率放大器的输入 端与射频信号的输入端相连， 其中： 该保护电路还包括带通滤波器， 所述带 通滤波器位于所述射频信号的输入端和所述功率放大器的输入端之间； 所述 带通滤波器的中心频率为所述功率放大器工作频带的中心频率， 所述带通滤 波器的工作带宽大于所述功率放大器的工作带宽。  What is claimed is: 1. A protection circuit for a power amplifier, comprising a power amplifier, wherein an input end of the power amplifier is connected to an input end of the radio frequency signal, wherein: the protection circuit further comprises a band pass filter, wherein the band pass filter is located at the radio frequency Between the input end of the signal and the input end of the power amplifier; the center frequency of the band pass filter is a center frequency of the operating band of the power amplifier, and the operating bandwidth of the band pass filter is greater than that of the power amplifier Working bandwidth.
2、 根据权利要求 1所述的保护电路， 其中：  2. The protection circuit of claim 1 wherein:
所述带通滤波器为腔体滤波器、 介质滤波器、 微带滤波器、 陶瓷滤波器 或集总元件（LC )滤波器。  The band pass filter is a cavity filter, a dielectric filter, a microstrip filter, a ceramic filter, or a lumped element (LC) filter.
3、 根据权利要求 1或 2所述的保护电路， 其中：  3. The protection circuit according to claim 1 or 2, wherein:
所述功率放大器为单管功率放大器或功率放大模块。  The power amplifier is a single tube power amplifier or a power amplification module.
4、 根据权利要求 3所述的保护电路， 其中：  4. The protection circuit of claim 3, wherein:
所述功率放大模块包括平衡式 AB类放大器、 道赫蒂（Doherty )功率放 大器以及多个功率放大器串并联所构成的功放系统。  The power amplifying 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.
5、 一种功率放大器的保护方法， 该保护方法包括：  5. A method of protecting a power amplifier, the protection method comprising:
将射频信号输入端与带通滤波器的输入端相连；  Connecting the RF signal input terminal to the input of the band pass filter;
将所述带通滤波器的输出端与所述功率放大器的输入端相连； 其中， 所述带通滤波器的中心频率与所述功率放大器的中心频率相同， 所述带通滤波器的工作带宽大于所述功率放大器的工作带宽。  Connecting an output end of the band pass filter to an input end of the power amplifier; wherein 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 Greater than the operating bandwidth of the power amplifier.
6、 根据权利要求 5所述的保护方法， 其中：  6. The protection method according to claim 5, wherein:
所述带通滤波器为腔体滤波器、 介质滤波器、 微带滤波器、 陶瓷滤波器 或集总元件（LC )滤波器。  The band pass filter is a cavity filter, a dielectric filter, a microstrip filter, a ceramic filter, or a lumped element (LC) filter.
7、 根据权利要求 5或 6所述的保护方法， 其中：  7. The protection method according to claim 5 or 6, wherein:
所述功率放大器为单管功率放大器或功率放大模块。  The power amplifier is a single tube power amplifier or a power amplification module.
8、 根据权利要求 7所述的保护方法， 其中：  8. The protection method according to claim 7, wherein:
所述功率放大模块包括平衡式 AB类放大器、 道赫蒂（Doherty )功率放 大器以及多个功率放大器串并联所构成的功放系统。  The power amplifying 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.
PCT/CN2012/072371 2011-12-30 2012-03-15 Protection circuit and protection method for power amplifier WO2013097354A1 (en)

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CN201110453038.0A CN103187933B (en) 2011-12-30 The protection circuit of power amplifier and guard method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113114288A (en) * 2021-05-21 2021-07-13 中国电子科技集团公司第二十九研究所 High-power transmitter power trap method and trap assembly

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CN1169066A (en) * 1996-03-27 1997-12-31 松下电器产业株式会社 Radio receiving apparatus
CN1174450A (en) * 1996-06-25 1998-02-25 哈里公司 Direct up -conversion of digital communication signals into analog IF output signals by means of pre-distortion filter and frequency replica-selecting bandpass filater
CN102006127A (en) * 2010-10-28 2011-04-06 中国电子科技集团公司第五十四研究所 Reconfigurable signal source platform

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1169066A (en) * 1996-03-27 1997-12-31 松下电器产业株式会社 Radio receiving apparatus
CN1174450A (en) * 1996-06-25 1998-02-25 哈里公司 Direct up -conversion of digital communication signals into analog IF output signals by means of pre-distortion filter and frequency replica-selecting bandpass filater
CN102006127A (en) * 2010-10-28 2011-04-06 中国电子科技集团公司第五十四研究所 Reconfigurable signal source platform

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113114288A (en) * 2021-05-21 2021-07-13 中国电子科技集团公司第二十九研究所 High-power transmitter power trap method and trap assembly

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