WO2015135267A1 - Power amplifier circuit, power amplifying apparatus, and broadband matching method therefor - Google Patents

Power amplifier circuit, power amplifying apparatus, and broadband matching method therefor Download PDF

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Publication number
WO2015135267A1
WO2015135267A1 PCT/CN2014/081879 CN2014081879W WO2015135267A1 WO 2015135267 A1 WO2015135267 A1 WO 2015135267A1 CN 2014081879 W CN2014081879 W CN 2014081879W WO 2015135267 A1 WO2015135267 A1 WO 2015135267A1
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Prior art keywords
unit
power
main
phase
auxiliary
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PCT/CN2014/081879
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French (fr)
Chinese (zh)
Inventor
余敏德
戴丽
秦天银
冯萍丽
王小平
张晓毅
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中兴通讯股份有限公司
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Publication of WO2015135267A1 publication Critical patent/WO2015135267A1/en

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Classifications

    • 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
    • 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
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
    • 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
    • H03F1/42—Modifications of amplifiers to extend the bandwidth
    • 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
    • H03F1/56—Modifications of input or output impedances, not otherwise provided for
    • 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
    • H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/36—Indexing scheme relating to amplifiers the amplifier comprising means for increasing the bandwidth
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/387—A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier

Definitions

  • the present invention relates to the field of communications, and in particular, to a power amplifier circuit, a power amplifying device, and a broadband matching method thereof. Background technique
  • the power amplifier (referred to as power amplifier) as an important part of the base station directly relates to the quality and communication effect of the base station transmitting signal.
  • the multi-mode integration of base stations has become more demanding on power amplifiers. Different frequency bands of various standard signals require a wide bandwidth of power amplifiers. Therefore, broadband power amplifiers have become a hot research topic.
  • the Doherty power amplifier As shown in Figure 1, the traditional Doherty power amplifier consists of two or more power amplifier tubes, which are divided into main power amplifier PA1 and auxiliary power amplifier PA2. The input signal is separated by the bridge and sent to the main power amplifier PA1 and the auxiliary power amplifier PA2, and then amplified and then combined into one way. In order to compensate for the 90° phase difference caused by the bridge, the output of the amplifier needs to be phase aligned by a 1/4 wavelength microstrip line. However, because the 1/4-wavelength microstrip line has frequency characteristics, it can only be aligned for a certain frequency point, and the phase of other frequency points has a certain degree of deviation. The influence of the phase deviation of the ordinary narrow-band power amplifier is not obvious, but for the broadband. The power amplifier, the phase deviation may reach 10. Even higher, at this time, the phase deviation has a large impact on the loss of power and efficiency. Summary of the invention
  • Embodiments of the present invention provide a power amplifier circuit, a power amplifying device, and a broadband matching method thereof, which are intended to improve bandwidth and efficiency of a power amplifier circuit.
  • the present invention provides a power amplifier circuit including a power distribution unit and a main An amplifying unit, a power combining unit, and at least one auxiliary amplifying unit in parallel with the main amplifying unit, wherein the input signals are distributed by the power distributing unit and output to the main amplifying unit and the auxiliary amplifying unit respectively, through the main
  • the amplified multi-channel signals of the amplifying unit and the auxiliary amplifying unit are combined into one signal by the power combining unit, and then output.
  • An impedance transformation line is connected in series between the main amplification unit and the power synthesis unit and between the at least one auxiliary amplification unit and the power synthesis unit;
  • the power amplifier circuit further includes a phase compensation unit, the phase compensation unit being connected in series on the main amplification unit branch, or in series on the at least one auxiliary amplification unit branch, or in series on the main amplification unit branch and the At least one auxiliary amplifying unit branch, the phase compensating unit has the same phase characteristic as the impedance transforming line, and the phase compensating unit is arranged to cancel the high and low frequency point phase difference caused by the impedance transforming line.
  • a compensation line is connected between the input terminal and the output terminal of the power distribution unit and between the output terminal of the auxiliary amplification unit and the power synthesis unit.
  • the power distribution unit includes a bridge, an input end of the bridge receives an input signal, an output end of the bridge is connected to the main amplification unit, and another output end of the bridge is The auxiliary amplification unit is connected.
  • the main amplifying unit includes a main amplifier
  • the auxiliary amplifying unit includes an auxiliary amplifier, an input end of the main amplifier and an output end of the bridge, an output end of the main amplifier
  • the A compensation line is connected between the power combining units, between the input of the auxiliary amplifier and the output of the bridge, and between the output of the auxiliary amplifier and the power combining unit.
  • the impedance transformation line is a 1/4 wavelength microstrip line, and the 1/4 wavelength microstrip line is connected between the main amplifier and the power combining unit.
  • the phase compensation unit is connected to an output of the bridge and the auxiliary amplifier Between the inputs.
  • the phase compensation unit comprises a main transmission line, a bypass capacitor and a bypass microstrip line, one end of the main transmission line is connected to an output end of the bridge, and the other end of the main transmission line is compensated by An input end of the auxiliary amplifier is connected; one end of the bypass capacitor is connected to the main transmission line, and the other end of the bypass capacitor is grounded; one end of the bypass microstrip line is connected to the main transmission line The other end of the bypass microstrip line is grounded or suspended.
  • the phase compensation unit further includes a phase compensation microstrip line, the phase compensation microstrip line is connected in series with the main transmission line, and is connected between the output end of the bridge and the input end of the auxiliary amplifier. .
  • Embodiments of the present invention also provide a power amplifying apparatus including the power amplifier circuit as described above.
  • the embodiment of the invention further provides a broadband matching method for the power amplifying device as described above, which comprises:
  • the power distribution unit distributes the input signal to a phase difference of 90.
  • the multi-channel signals are respectively output to the main amplifying unit and the auxiliary amplifying unit for amplification;
  • the impedance conversion line is 90 for the multi-channel signal amplified by the main amplification unit and the auxiliary amplification unit.
  • the phase difference is phase-aligned to generate a high-low frequency point phase difference;
  • phase compensation unit Offset the high and low frequency point phase difference by the phase compensation unit, wherein the phase characteristic of the phase compensation unit is the same as the phase characteristic of the impedance transformation line;
  • the power synthesizing unit synthesizes the multiplexed signal that cancels the phase difference of the high and low frequency points into one signal and outputs it.
  • the step of canceling the phase difference of the high and low frequency points by the phase compensation unit comprises: first acquiring phase characteristics of the impedance transformation line; and further setting a main transmission line in the phase compensation unit based on a phase characteristic of the impedance transformation line
  • the size of the bypass microstrip line and the capacitance value of the bypass capacitor are such that the phase compensation unit has the same phase characteristic as the 1/4 wavelength microstrip line, and cancels the high and low frequency points brought by the 1/4 wavelength microstrip line. Phase difference.
  • a power amplifier circuit, a power amplifying device, and a broadband matching method thereof by connecting a phase of an impedance conversion line in series with a main amplifying unit and/or at least one auxiliary amplifying unit
  • the phase compensation unit with the same bit characteristics cancels the phase difference between the high and low frequencies caused by the impedance conversion line, so that the phase of the high and low frequency points in the entire frequency band of the power amplifier circuit can achieve phase alignment, reducing power loss, thereby improving output power.
  • the efficiency the bandwidth of the power amplifier circuit is expanded, and the structure of the phase compensation unit is very simple and the cost is low.
  • Figure 1 is a circuit diagram of a conventional Doherty power amplifier
  • FIG. 2 is a schematic structural view of an embodiment of a power amplifier circuit of the present invention.
  • FIG. 3 is a circuit diagram of an embodiment of a power amplifier circuit of the present invention. Preferred embodiment of the invention
  • the embodiment of the present invention provides a power amplifier circuit.
  • the power amplifier circuit includes a power distribution unit 1, a main amplification unit 2, a power synthesis unit 4, and at least one auxiliary amplification unit 3 connected in parallel with the main amplification unit 2.
  • the input signals are distributed by the power distribution unit 1 and output to the main amplification unit 2 and the auxiliary amplification unit 3, respectively.
  • the multi-channel signals amplified by the main amplification unit 2 and the auxiliary amplification unit 3 are combined into a signal by the power synthesis unit 4 and output. .
  • An impedance transformation line 5 is connected in series between the main amplification unit 2 and/or the at least one auxiliary amplification unit 3 and the power synthesis unit 4, and only the impedance conversion line 5 is connected in series to the main amplification unit 2 and the power synthesis Between the units 4, the impedance transformation line 5 may also be connected in series between the at least one auxiliary amplification unit 3 and the power synthesis unit 4, or between the main amplification unit and the power synthesis unit, and at least The position of a change line 5 in the circuit is not limited.
  • the power amplifier circuit further includes: a phase compensating unit 6 connected in series on the branch of the main amplifying unit 2 and/or the at least one auxiliary amplifying unit 3, wherein only the phase compensating unit 6 is connected in series on the branch of the auxiliary amplifying unit 3, the phase The compensation unit 6 can also be connected in series to at least one auxiliary amplification unit 3
  • a phase compensating unit 6 may be connected in series on the branch of the main amplifying unit 2 and the at least one auxiliary amplifying unit 3, and the position of the phase compensating unit 6 in the circuit is not limited.
  • the phase compensation unit 6 has the same phase characteristics as the impedance conversion line 5, and is used to cancel the high-low frequency point phase difference caused by the impedance conversion line 5.
  • the present embodiment cancels the phase difference between the high and low frequencies caused by the impedance conversion line 5 by serially connecting a phase compensation unit 6 having the same phase characteristic as the impedance transformation line 5 to the main amplification unit 2 and/or the at least one auxiliary amplification unit 3.
  • the phase of the high and low frequency points in the entire frequency band of the power amplifier circuit can achieve phase alignment, reduce power loss, thereby improving output power and efficiency, and expanding the bandwidth of the power amplifier circuit.
  • FIG. 3 is a circuit diagram of an embodiment of a power amplifier circuit of the present invention; an input end of the main amplification unit 2 and an output end of the power distribution unit 1, and an output end of the main amplification unit 2 Between the power combining unit 4, the input end of the auxiliary amplifying unit 3 and the output end of the power distribution unit 1, and the output end of the auxiliary amplifying unit 3 and the power combining unit 4, The compensation line Offset is connected.
  • the power distribution unit 1 includes a bridge. It should be noted that the bridge in this embodiment may be a bridge of 3 dB, 5 dB, or other specifications, which is not limited herein. For convenience of description, only the embodiment is used in this embodiment.
  • the bridge is a 3dB bridge as an example.
  • the input end of the 3dB bridge receives an input signal, one output of the 3dB bridge is connected to the main amplification unit 2, and the other output is connected to the auxiliary amplification unit 3.
  • the main amplification unit 2 includes a main amplifier PA3, and the auxiliary amplification unit 3 includes an auxiliary amplifier PA4.
  • a compensation line Offset is connected between the output ends of the bridge and between the output of the auxiliary amplifier PA4 and the power combining unit 4.
  • the impedance conversion line 5 is a 1/4 wavelength microstrip line connected between the main amplifier PA3 and the power combining unit 4.
  • the phase compensation unit 6 is connected between the output of the 3dB bridge and the input of the auxiliary amplifier PA4.
  • the phase compensation unit 6 includes a main transmission line 61, a bypass capacitor 62, and a bypass microstrip line 63.
  • One end of the main transmission line 61 is connected to the output end of the 3dB bridge, and the other end of the main transmission line 61 is connected to the input end of the auxiliary amplifier PA4 via a compensation line Offset; one end of the bypass capacitor 62 is connected On the main transmission line 61, the bypass capacitor 62 The other end is grounded; one end of the bypass microstrip line 63 is connected to the main transmission line 61, and the other end of the bypass microstrip line 63 is grounded or suspended.
  • the input signal is separated by a 3dB bridge and sent to the main amplifier PA3 and the auxiliary amplifier PA4. After amplification, it is combined into one way.
  • the two signals separated by the 3dB bridge will have 90.
  • Phase difference the 90° phase difference is brought about by the 3dB bridge.
  • the output of the main amplifier PA3 is set with a 1/4 wavelength microstrip line for phase alignment.
  • the 1/4-wavelength microstrip line has a frequency characteristic, it can only be aligned for one frequency point, and the phase of other frequency points has a certain degree of deviation, so that the 1/4 wavelength microstrip line compensates for 3 dB of electricity.
  • the 90° phase difference brought by the bridge also brings about the problem of high and low frequency point phase difference.
  • the phase is set between the output end of the 3dB bridge and the input end of the auxiliary amplifier PA4.
  • the compensating unit 6, the slope of the phase characteristic curve of the phase compensating unit 6 and the slope of the phase characteristic curve of the 1/4 wavelength microstrip line are the same, and the phase error of the high and low frequency points can be cancelled, thereby ensuring the phase alignment of the center frequency of the power amplifier circuit , that is, the phase of all frequency points is aligned.
  • the size of the main transmission line 61, the bypass microstrip line 63, and the capacitance value of the bypass capacitor 62 in the phase compensation unit 6 can be set by an auxiliary design of the simulation software, thereby changing the microstrip size and the capacitance value.
  • the phase compensation slope and the port standing wave of the phase compensating unit 6 are adjusted such that the slope of the phase characteristic curve of the phase compensating unit 6 and the slope of the phase characteristic curve of the 1/4 wavelength microstrip line are the same.
  • the minimum size of the main transmission line 61 is limited by the bypass capacitor 62 pad and cannot be smaller than the bypass capacitor 62 pad.
  • the length and width of the bypass microstrip line 63 and the value of the bypass capacitor 62 capacitor have a large influence on the slope characteristics of the phase and the standing wave of the port.
  • the phase compensating unit 6 can be used. Add a small phase compensation microstrip line.
  • the phase compensation microstrip line is connected in series with the main transmission line 61 of the phase compensation unit 6 and is connected between the output terminal of the 3dB bridge and the input terminal of the auxiliary amplifier PA4 to ensure that the phase of the center frequency is zero.
  • phase compensation unit 6 is very simple and easy to implement. Small size, excellent performance, high reliability, and good productivity, effectively expanding the bandwidth of the power amplifier circuit.
  • the embodiment of the present invention further provides a power amplifying device, which includes the power amplifier circuit.
  • the circuit structure and principle of the power amplifier circuit can be referred to the foregoing, and details are not described herein. Since the above power amplifier circuit is used, the output power and efficiency are improved, and the bandwidth of the power amplifier circuit is expanded to satisfy The requirements of the base station for the power amplifying device in practical applications.
  • the embodiment of the present invention further provides a broadband matching method for the above power amplifying device, the method comprising: first, the input signal is allocated by the power distribution unit 1 to have a phase difference of 90.
  • the multiplexed signals are respectively output to the main amplifying unit 2 and the auxiliary amplifying unit 3 for amplification; and the impedance converting line 5 is applied to 90 of the multiplexed signals of the main amplifying unit 2 and the auxiliary amplifying unit 3.
  • the phase difference is phase-aligned to generate a high-low frequency point phase difference; the phase compensation unit 6 cancels the high-low frequency point phase difference, wherein the phase characteristic of the phase compensation unit 6 is the same as the phase characteristic of the impedance conversion line 5;
  • the power combining unit 4 synthesizes the multiplexed signals that cancel the phase difference of the high and low frequency points into one signal and outputs them.
  • the phase compensation unit 6 first acquiring the phase characteristic of the impedance transformation line 5; and further based on the impedance transformation line 5, that is, the phase of the 1/4 wavelength microstrip line
  • the size of the main transmission line 61, the bypass microstrip line 63, and the capacitance value of the bypass capacitor 62 in the phase compensation unit 6 are set by the simulation software so that the phase characteristic of the phase compensation unit 61 and the 1/4 wavelength.
  • the microstrip line is the same, which cancels the phase difference between the high and low frequencies caused by the 1/4 wavelength microstrip line, thereby improving the output power and efficiency.
  • the power amplifier circuit, the power amplifying device and the broadband matching method thereof cancel the impedance conversion line by connecting a phase compensation unit having the same phase characteristic as the impedance transformation line in series on the main amplification unit and/or the at least one auxiliary amplification unit
  • the phase difference between the high and low frequencies makes the phase alignment of the high and low frequency points in the entire frequency band of the power amplifier circuit, which reduces the power loss, thereby improving the output power and efficiency, expanding the bandwidth of the power amplifier circuit, and the phase compensation unit
  • the structure is very simple and the cost is low.
  • the embodiment of the invention improves the output power and efficiency, expands the bandwidth of the power amplifier circuit, and has a simple structure and a low cost.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Amplifiers (AREA)
  • Microwave Amplifiers (AREA)

Abstract

A power amplifier circuit, a power amplifying apparatus, and a broadband matching method therefor. The power amplifier circuit comprises a power allocation unit, a main amplifying unit, a power combining unit and at least one auxiliary amplifying unit connected in parallel to the main amplifying unit. Input signals are allocated by the power allocation unit and then are separately output to the main amplifying unit and the auxiliary amplifying unit. Multiple signals amplified by the main amplifying unit and the auxiliary amplifying unit are combined into one signal by the power combining unit and then are output. An impedance conversion line is connected in series between the main amplifying unit and/or the at least one auxiliary amplifying unit and the power combining unit. The power amplifier circuit also comprises a phase compensation unit connected in series to a branch of the main amplifying unit and/or the at least one auxiliary amplifying unit. The phase compensation unit and the impedance conversion line have the same phase characteristics, so as to offset a phase difference between a high frequency point and a low frequency point, which is caused by the impedance conversion line.

Description

功放电路、 功率放大装置及其宽带匹配方法 技术领域  Power amplifier circuit, power amplifying device and broadband matching method thereof
本发明涉及通信领域， 尤其涉及一种功放电路、 功率放大装置及其宽带 匹配方法。 背景技术  The present invention relates to the field of communications, and in particular, to a power amplifier circuit, a power amplifying device, and a broadband matching method thereof. Background technique
目前， 随着市场竟争的日益激烈， 基站产品的性能高低成为业内竟争的 主要焦点。 基于统一平台的多模一体化基站的出现， 使多制式技术体系无缝 融合， 使 GSM、 WCDMA、 HSPA/HSPA+和 LTE统一基站成为现实， 实现了 基站共享， 既能解决现有投资的长期保护问题， 帮助运营商向未来平滑演进， 又能对现网落后淘汰的 2G设备进行反向替代和优化， 节省了大量成本。 而 功率放大器 （简称功放）作为基站的重要组成部分， 直接关系着基站发射信 号的质量和通信效果。 基站的多模一体化对功放的要求变得更高， 各种制式 信号的频段不同要求功放具有很宽的带宽， 因此， 宽带功放成为目前研究的 热点。  At present, with the increasingly fierce market competition, the performance of base station products has become the main focus of competition in the industry. The emergence of multi-mode integrated base stations based on a unified platform enables seamless integration of multi-standard technology systems, making GSM, WCDMA, HSPA/HSPA+ and LTE unified base stations a reality, enabling base station sharing, which can solve the long-term protection of existing investments. The problem is to help operators to smoothly evolve into the future, and to reverse replace and optimize the 2G equipment that is behind the elimination of the existing network, which saves a lot of cost. The power amplifier (referred to as power amplifier) as an important part of the base station directly relates to the quality and communication effect of the base station transmitting signal. The multi-mode integration of base stations has become more demanding on power amplifiers. Different frequency bands of various standard signals require a wide bandwidth of power amplifiers. Therefore, broadband power amplifiers have become a hot research topic.
现有基站功放中应用最广的就是 Doherty (多赫蒂）功放， 如图 1所示， 传统的 Doherty功放由 2到多个功放管组成，分为主功放 PA1和辅助功放 PA2。 输入信号经电桥分离开分别送入主功放 PA1和辅助功放 PA2, 经放大后再合 成为一路。 为了补偿电桥带来的 90° 相位差， 在功放的输出需要通过 1/4波 长微带线进行相位对齐。 但是因为 1/4 波长微带线具有频率特性， 只能针对 某一个频点进行对齐， 而其他频点的相位就有一定程度的偏差， 对于普通窄 带功放相位偏差影响不是很明显， 但对于宽带功放， 相位偏差可能达到 10。 甚至更高， 这时， 相位偏差对功率和效率的损失会造成较大的影响。 发明内容  The most widely used of the existing base station power amplifiers is the Doherty power amplifier. As shown in Figure 1, the traditional Doherty power amplifier consists of two or more power amplifier tubes, which are divided into main power amplifier PA1 and auxiliary power amplifier PA2. The input signal is separated by the bridge and sent to the main power amplifier PA1 and the auxiliary power amplifier PA2, and then amplified and then combined into one way. In order to compensate for the 90° phase difference caused by the bridge, the output of the amplifier needs to be phase aligned by a 1/4 wavelength microstrip line. However, because the 1/4-wavelength microstrip line has frequency characteristics, it can only be aligned for a certain frequency point, and the phase of other frequency points has a certain degree of deviation. The influence of the phase deviation of the ordinary narrow-band power amplifier is not obvious, but for the broadband. The power amplifier, the phase deviation may reach 10. Even higher, at this time, the phase deviation has a large impact on the loss of power and efficiency. Summary of the invention
本发明实施例提供一种功放电路、 功率放大装置及其宽带匹配方法， 旨 在提高功放电路的带宽及效率。  Embodiments of the present invention provide a power amplifier circuit, a power amplifying device, and a broadband matching method thereof, which are intended to improve bandwidth and efficiency of a power amplifier circuit.
为了达到上述目的， 本发明提出一种功放电路， 包括功率分配单元、 主 放大单元、 功率合成单元以及与所述主放大单元并联的至少一个辅助放大单 元， 输入信号经所述功率分配单元分配后分别输出至所述主放大单元及所述 辅助放大单元， 经所述主放大单元及所述辅助放大单元放大后的多路信号再 经所述功率合成单元合成为一路信号后输出， In order to achieve the above object, the present invention provides a power amplifier circuit including a power distribution unit and a main An amplifying unit, a power combining unit, and at least one auxiliary amplifying unit in parallel with the main amplifying unit, wherein the input signals are distributed by the power distributing unit and output to the main amplifying unit and the auxiliary amplifying unit respectively, through the main The amplified multi-channel signals of the amplifying unit and the auxiliary amplifying unit are combined into one signal by the power combining unit, and then output.
者所述主放大单元与所述功率合成单元之间以及所述至少一个辅助放大单元 与所述功率合成单元之间均串联有一阻抗变换线； An impedance transformation line is connected in series between the main amplification unit and the power synthesis unit and between the at least one auxiliary amplification unit and the power synthesis unit;
该功放电路还包括相位补偿单元， 所述相位补偿单元串联在所述主放大 单元支路上， 或串联在所述至少一个辅助放大单元支路上， 或串联在所述主 放大单元支路上以及所述至少一个辅助放大单元支路上， 所述相位补偿单元 与所述阻抗变换线的相位特性相同， 所述相位补偿单元设置为抵消所述阻抗 变换线带来的高低频点相位差。  The power amplifier circuit further includes a phase compensation unit, the phase compensation unit being connected in series on the main amplification unit branch, or in series on the at least one auxiliary amplification unit branch, or in series on the main amplification unit branch and the At least one auxiliary amplifying unit branch, the phase compensating unit has the same phase characteristic as the impedance transforming line, and the phase compensating unit is arranged to cancel the high and low frequency point phase difference caused by the impedance transforming line.
入端与所述功率分配单元的输出端之间以及所述辅助放大单元的输出端与所 述功率合成单元之间均连接有 卜偿线。 A compensation line is connected between the input terminal and the output terminal of the power distribution unit and between the output terminal of the auxiliary amplification unit and the power synthesis unit.
较佳地， 所述功率分配单元包括电桥， 所述电桥的输入端接收输入信号， 所述电桥的一路输出端与所述主放大单元相连， 所述电桥的另一路输出端与 所述辅助放大单元连接。  Preferably, the power distribution unit includes a bridge, an input end of the bridge receives an input signal, an output end of the bridge is connected to the main amplification unit, and another output end of the bridge is The auxiliary amplification unit is connected.
较佳地， 所述主放大单元包括主放大器， 所述辅助放大单元包括辅助放 大器， 所述主放大器的输入端与所述电桥的输出端之间、 所述主放大器的输 出端与所述功率合成单元之间、 所述辅助放大器的输入端与所述电桥的输出 端之间， 以及所述辅助放大器的输出端与所述功率合成单元之间， 均连接有 补偿线。  Preferably, the main amplifying unit includes a main amplifier, the auxiliary amplifying unit includes an auxiliary amplifier, an input end of the main amplifier and an output end of the bridge, an output end of the main amplifier, and the A compensation line is connected between the power combining units, between the input of the auxiliary amplifier and the output of the bridge, and between the output of the auxiliary amplifier and the power combining unit.
较佳地， 所述阻抗变换线为 1/4波长微带线， 所述 1/4波长微带线连接在 所述主放大器与所述功率合成单元之间。  Preferably, the impedance transformation line is a 1/4 wavelength microstrip line, and the 1/4 wavelength microstrip line is connected between the main amplifier and the power combining unit.
较佳地， 所述相位补偿单元连接在所述电桥的输出端与所述辅助放大器 的输入端之间。 Preferably, the phase compensation unit is connected to an output of the bridge and the auxiliary amplifier Between the inputs.
较佳地， 所述相位补偿单元包括主传输线、 旁路电容和旁路微带线， 所 述主传输线的一端与所述电桥的输出端连接， 所述主传输线的另一端经补偿 线与所述辅助放大器的输入端连接； 所述旁路电容的一端连接在所述主传输 线上， 所述旁路电容的另一端接地； 所述旁路微带线的一端连接在所述主传 输线上， 所述旁路微带线的另一端接地或悬空。  Preferably, the phase compensation unit comprises a main transmission line, a bypass capacitor and a bypass microstrip line, one end of the main transmission line is connected to an output end of the bridge, and the other end of the main transmission line is compensated by An input end of the auxiliary amplifier is connected; one end of the bypass capacitor is connected to the main transmission line, and the other end of the bypass capacitor is grounded; one end of the bypass microstrip line is connected to the main transmission line The other end of the bypass microstrip line is grounded or suspended.
较佳地， 所述相位补偿单元还包括相位补偿微带线， 所述相位补偿微带 线与所述主传输线串联后连接在所述电桥的输出端与所述辅助放大器的输入 端之间。  Preferably, the phase compensation unit further includes a phase compensation microstrip line, the phase compensation microstrip line is connected in series with the main transmission line, and is connected between the output end of the bridge and the input end of the auxiliary amplifier. .
本发明实施例还提出一种功率放大装置， 包括如上所述的功放电路。 本发明实施例又提出一种如上所述的功率放大装置的宽带匹配方法， 包 括：  Embodiments of the present invention also provide a power amplifying apparatus including the power amplifier circuit as described above. The embodiment of the invention further provides a broadband matching method for the power amplifying device as described above, which comprises:
功率分配单元将输入信号分配为相位差为 90。 的多路信号后分别输出至 主放大单元及辅助放大单元进行放大；  The power distribution unit distributes the input signal to a phase difference of 90. The multi-channel signals are respectively output to the main amplifying unit and the auxiliary amplifying unit for amplification;
由阻抗变换线针对主放大单元及辅助放大单元放大后的多路信号的 90。 相位差进行相位对齐， 产生高低频点相位差；  The impedance conversion line is 90 for the multi-channel signal amplified by the main amplification unit and the auxiliary amplification unit. The phase difference is phase-aligned to generate a high-low frequency point phase difference;
通过相位补偿单元抵消高低频点相位差， 其中， 所述相位补偿单元的相 位特性与所述阻抗变换线的相位特性相同；  Offset the high and low frequency point phase difference by the phase compensation unit, wherein the phase characteristic of the phase compensation unit is the same as the phase characteristic of the impedance transformation line;
功率合成单元将抵消了高低频点相位差的多路信号合成为一路信号后输 出。  The power synthesizing unit synthesizes the multiplexed signal that cancels the phase difference of the high and low frequency points into one signal and outputs it.
较佳地， 所述通过相位补偿单元抵消高低频点相位差的步骤包括： 首先 获取所述阻抗变换线的相位特性； 再基于所述阻抗变换线的相位特性设置所 述相位补偿单元中主传输线、 旁路微带线的尺寸及旁路电容的电容值大小， 以使所述相位补偿单元相位特性与 1/4波长微带线相同，抵消 1/4波长微带线 带来的高低频点相位差。  Preferably, the step of canceling the phase difference of the high and low frequency points by the phase compensation unit comprises: first acquiring phase characteristics of the impedance transformation line; and further setting a main transmission line in the phase compensation unit based on a phase characteristic of the impedance transformation line The size of the bypass microstrip line and the capacitance value of the bypass capacitor are such that the phase compensation unit has the same phase characteristic as the 1/4 wavelength microstrip line, and cancels the high and low frequency points brought by the 1/4 wavelength microstrip line. Phase difference.
本发明实施例提出的一种功放电路、 功率放大装置及其宽带匹配方法， 通过在主放大单元和 /或至少一个辅助放大单元上串联一与阻抗变换线的相 位特性相同的相位补偿单元， 来抵消阻抗变换线带来的高低频点相位差， 使 功放电路整个频带内的高低频点的相位都可以实现相位对齐， 减少了功率损 耗， 从而提高了输出功率及效率， 扩展了功放电路的带宽， 且该相位补偿单 元的结构十分简单， 成本较低。 附图概述 A power amplifier circuit, a power amplifying device, and a broadband matching method thereof according to an embodiment of the present invention, by connecting a phase of an impedance conversion line in series with a main amplifying unit and/or at least one auxiliary amplifying unit The phase compensation unit with the same bit characteristics cancels the phase difference between the high and low frequencies caused by the impedance conversion line, so that the phase of the high and low frequency points in the entire frequency band of the power amplifier circuit can achieve phase alignment, reducing power loss, thereby improving output power. And the efficiency, the bandwidth of the power amplifier circuit is expanded, and the structure of the phase compensation unit is very simple and the cost is low. BRIEF abstract
图 1是传统 Doherty功放的电路图；  Figure 1 is a circuit diagram of a conventional Doherty power amplifier;
图 2是本发明功放电路一实施例的结构示意图；  2 is a schematic structural view of an embodiment of a power amplifier circuit of the present invention;
图 3是本发明功放电路一实施例的电路图。 本发明的较佳实施方式  3 is a circuit diagram of an embodiment of a power amplifier circuit of the present invention. Preferred embodiment of the invention
应当理解， 此处所描述的具体实施例仅仅用以解释本发明， 并不用于限 定本发明。 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。  It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It should be noted that the embodiments in the present application and the features in the embodiments may be arbitrarily combined with each other without conflict.
本发明实施例提供一种功放电路， 参照图 2, 该功放电路包括功率分配 单元 1、 主放大单元 2、 功率合成单元 4以及与所述主放大单元 2并联的至少 一个辅助放大单元 3。 输入信号经功率分配单元 1分配后分别输出至主放大 单元 2及辅助放大单元 3 ,经主放大单元 2及辅助放大单元 3放大后的多路信 号再经功率合成单元 4合成为一路信号后输出。 所述主放大单元 2和 /或至少 一个辅助放大单元 3与所述功率合成单元 4之间串联有一阻抗变换线 5 , 图 中仅以阻抗变换线 5串联在主放大单元 2与所述功率合成单元 4之间示意， 阻抗变换线 5也可以串联在至少一个辅助放大单元 3与所述功率合成单元 4 之间， 也可以在所述主放大单元与所述功率合成单元之间以及所述至少一个 换线 5在电路中的位置不进行限定。 The embodiment of the present invention provides a power amplifier circuit. Referring to FIG. 2, the power amplifier circuit includes a power distribution unit 1, a main amplification unit 2, a power synthesis unit 4, and at least one auxiliary amplification unit 3 connected in parallel with the main amplification unit 2. The input signals are distributed by the power distribution unit 1 and output to the main amplification unit 2 and the auxiliary amplification unit 3, respectively. The multi-channel signals amplified by the main amplification unit 2 and the auxiliary amplification unit 3 are combined into a signal by the power synthesis unit 4 and output. . An impedance transformation line 5 is connected in series between the main amplification unit 2 and/or the at least one auxiliary amplification unit 3 and the power synthesis unit 4, and only the impedance conversion line 5 is connected in series to the main amplification unit 2 and the power synthesis Between the units 4, the impedance transformation line 5 may also be connected in series between the at least one auxiliary amplification unit 3 and the power synthesis unit 4, or between the main amplification unit and the power synthesis unit, and at least The position of a change line 5 in the circuit is not limited.
该功放电路还包括： 串联在所述主放大单元 2和 /或至少一个辅助放大单 元 3支路上的相位补偿单元 6, 图中仅以相位补偿单元 6 串联在辅助放大单 元 3支路上示意， 相位补偿单元 6也可以串联在至少一个辅助放大单元 3支 路上， 也可以在所述主放大单元 2和至少一个辅助放大单元 3支路上均串联 有相位补偿单元 6, 对相位补偿单元 6在电路中的位置不进行限定。 所述相 位补偿单元 6与所述阻抗变换线 5的相位特性相同， 用于抵消所述阻抗变换 线 5带来的高低频点相位差。 本实施例通过在主放大单元 2和 /或至少一个辅 助放大单元 3上串联一与阻抗变换线 5的相位特性相同的相位补偿单元 6, 来抵消阻抗变换线 5带来的高低频点相位差， 使功放电路整个频带内的高低 频点的相位都可以实现相位对齐， 减少了功率损耗， 从而提高了输出功率及 效率， 扩展了功放电路的带宽。 The power amplifier circuit further includes: a phase compensating unit 6 connected in series on the branch of the main amplifying unit 2 and/or the at least one auxiliary amplifying unit 3, wherein only the phase compensating unit 6 is connected in series on the branch of the auxiliary amplifying unit 3, the phase The compensation unit 6 can also be connected in series to at least one auxiliary amplification unit 3 On the road, a phase compensating unit 6 may be connected in series on the branch of the main amplifying unit 2 and the at least one auxiliary amplifying unit 3, and the position of the phase compensating unit 6 in the circuit is not limited. The phase compensation unit 6 has the same phase characteristics as the impedance conversion line 5, and is used to cancel the high-low frequency point phase difference caused by the impedance conversion line 5. The present embodiment cancels the phase difference between the high and low frequencies caused by the impedance conversion line 5 by serially connecting a phase compensation unit 6 having the same phase characteristic as the impedance transformation line 5 to the main amplification unit 2 and/or the at least one auxiliary amplification unit 3. The phase of the high and low frequency points in the entire frequency band of the power amplifier circuit can achieve phase alignment, reduce power loss, thereby improving output power and efficiency, and expanding the bandwidth of the power amplifier circuit.
参照图 3 , 图 3是本发明功放电路一实施例的电路图； 所述主放大单元 2 的输入端与所述功率分配单元 1的输出端之间、 所述主放大单元 2的输出端 与所述功率合成单元 4之间、 所述辅助放大单元 3的输入端与所述功率分配 单元 1的输出端之间， 以及所述辅助放大单元 3的输出端与所述功率合成单 元 4之间， 均连接有补偿线 Offset。  Referring to FIG. 3, FIG. 3 is a circuit diagram of an embodiment of a power amplifier circuit of the present invention; an input end of the main amplification unit 2 and an output end of the power distribution unit 1, and an output end of the main amplification unit 2 Between the power combining unit 4, the input end of the auxiliary amplifying unit 3 and the output end of the power distribution unit 1, and the output end of the auxiliary amplifying unit 3 and the power combining unit 4, The compensation line Offset is connected.
其中， 所述功率分配单元 1 包括电桥， 需要说明的是， 本实施例中的电 桥可以是 3dB、 5dB或其他规格的电桥， 在此不作限定， 为了便于说明， 本 实施例中仅以该电桥为 3dB电桥为例进行说明。 所述 3dB电桥的输入端接收 输入信号， 所述 3dB电桥的一路输出端与主放大单元 2连接， 另一路输出端 与辅助放大单元 3连接。  The power distribution unit 1 includes a bridge. It should be noted that the bridge in this embodiment may be a bridge of 3 dB, 5 dB, or other specifications, which is not limited herein. For convenience of description, only the embodiment is used in this embodiment. The bridge is a 3dB bridge as an example. The input end of the 3dB bridge receives an input signal, one output of the 3dB bridge is connected to the main amplification unit 2, and the other output is connected to the auxiliary amplification unit 3.
所述主放大单元 2包括主放大器 PA3 , 所述辅助放大单元 3包括辅助放 大器 PA4。 所述主放大器 PA3的输入端与所述 3dB电桥的输出端之间、 所述 主放大器 PA3的输出端与所述功率合成单元 4之间、所述辅助放大器 PA4的 输入端与所述 3dB电桥的输出端之间， 以及所述辅助放大器 PA4的输出端与 所述功率合成单元 4之间， 均连接有补偿线 Offset。  The main amplification unit 2 includes a main amplifier PA3, and the auxiliary amplification unit 3 includes an auxiliary amplifier PA4. An input of the main amplifier PA3 and an output of the 3dB bridge, an output of the main amplifier PA3 and the power synthesizing unit 4, an input of the auxiliary amplifier PA4 and the 3dB A compensation line Offset is connected between the output ends of the bridge and between the output of the auxiliary amplifier PA4 and the power combining unit 4.
所述阻抗变换线 5为 1/4波长微带线，所述 1/4波长微带线连接在所述主 放大器 PA3与所述功率合成单元 4之间。  The impedance conversion line 5 is a 1/4 wavelength microstrip line connected between the main amplifier PA3 and the power combining unit 4.
所述相位补偿单元 6 连接在所述 3dB 电桥的输出端与所述辅助放大器 PA4的输入端之间。 所述相位补偿单元 6包括主传输线 61、 旁路电容 62和 旁路微带线 63。 所述主传输线 61的一端与所述 3dB电桥的输出端连接， 所 述主传输线 61的另一端经补偿线 Offset与所述辅助放大器 PA4的输入端连 接； 所述旁路电容 62的一端连接在所述主传输线 61上， 所述旁路电容 62的 另一端接地； 所述旁路微带线 63的一端连接在所述主传输线 61上， 所述旁 路微带线 63的另一端接地或悬空。 The phase compensation unit 6 is connected between the output of the 3dB bridge and the input of the auxiliary amplifier PA4. The phase compensation unit 6 includes a main transmission line 61, a bypass capacitor 62, and a bypass microstrip line 63. One end of the main transmission line 61 is connected to the output end of the 3dB bridge, and the other end of the main transmission line 61 is connected to the input end of the auxiliary amplifier PA4 via a compensation line Offset; one end of the bypass capacitor 62 is connected On the main transmission line 61, the bypass capacitor 62 The other end is grounded; one end of the bypass microstrip line 63 is connected to the main transmission line 61, and the other end of the bypass microstrip line 63 is grounded or suspended.
输入信号经 3dB 电桥分离开后分别送入主放大器 PA3 和辅助放大器 PA4, 经放大后再合成为一路， 由此， 经 3dB电桥分离开的两路信号会有 90 。 相位差， 该 90° 相位差是由 3dB电桥带来的， 为了补偿 3dB电桥带来的 90° 相位差，在主放大器 PA3的输出设置有 1/4波长微带线来进行相位对齐。 但是由于 1/4 波长微带线具有频率特性， 只能针对某一个频点进行对齐， 而 其他频点的相位就有一定程度的偏差， 这样， 在 1/4波长微带线补偿了 3dB 电桥带来的 90° 相位差的同时， 也会带来高低频点相位差的问题， 本实施例 中，在所述 3dB电桥的输出端与所述辅助放大器 PA4的输入端之间设置相位 补偿单元 6,该相位补偿单元 6的相位特性曲线斜率和 1/4波长微带线的相位 特性曲线斜率相同， 可以将高低频点的相位误差抵消， 从而保证该功放电路 的中心频点相位对齐， 也即所有频点的相位均得到对齐。 较佳地， 可通过仿 真软件的辅助设计来设置相位补偿单元 6中主传输线 61、 旁路微带线 63的 尺寸大小及旁路电容 62的电容值大小，从而通过改变微带尺寸和电容值来调 整相位补偿单元 6的相位补偿斜率和端口驻波， 使该相位补偿单元 6的相位 特性曲线斜率和 1/4 波长微带线的相位特性曲线斜率相同。 其中， 主传输线 61的最小尺寸受旁路电容 62焊盘的限制， 不能小于旁路电容 62焊盘。 旁路 微带线 63的长宽、 旁路电容 62电容的取值对相位的斜率特性和端口驻波影 响较大。  The input signal is separated by a 3dB bridge and sent to the main amplifier PA3 and the auxiliary amplifier PA4. After amplification, it is combined into one way. Thus, the two signals separated by the 3dB bridge will have 90. Phase difference, the 90° phase difference is brought about by the 3dB bridge. To compensate for the 90° phase difference caused by the 3dB bridge, the output of the main amplifier PA3 is set with a 1/4 wavelength microstrip line for phase alignment. However, since the 1/4-wavelength microstrip line has a frequency characteristic, it can only be aligned for one frequency point, and the phase of other frequency points has a certain degree of deviation, so that the 1/4 wavelength microstrip line compensates for 3 dB of electricity. The 90° phase difference brought by the bridge also brings about the problem of high and low frequency point phase difference. In this embodiment, the phase is set between the output end of the 3dB bridge and the input end of the auxiliary amplifier PA4. The compensating unit 6, the slope of the phase characteristic curve of the phase compensating unit 6 and the slope of the phase characteristic curve of the 1/4 wavelength microstrip line are the same, and the phase error of the high and low frequency points can be cancelled, thereby ensuring the phase alignment of the center frequency of the power amplifier circuit , that is, the phase of all frequency points is aligned. Preferably, the size of the main transmission line 61, the bypass microstrip line 63, and the capacitance value of the bypass capacitor 62 in the phase compensation unit 6 can be set by an auxiliary design of the simulation software, thereby changing the microstrip size and the capacitance value. The phase compensation slope and the port standing wave of the phase compensating unit 6 are adjusted such that the slope of the phase characteristic curve of the phase compensating unit 6 and the slope of the phase characteristic curve of the 1/4 wavelength microstrip line are the same. The minimum size of the main transmission line 61 is limited by the bypass capacitor 62 pad and cannot be smaller than the bypass capacitor 62 pad. The length and width of the bypass microstrip line 63 and the value of the bypass capacitor 62 capacitor have a large influence on the slope characteristics of the phase and the standing wave of the port.
较佳地， 若相位补偿单元 6的斜率特性满足要求即与 1/4波长微带线的 相位特性曲线斜率相同， 但中心频点的相位较为接近而不为零时， 可在相位 补偿单元 6中增加一小段相位补偿微带线。 该相位补偿微带线与相位补偿单 元 6中的主传输线 61串联后连接在所述 3dB电桥的输出端与所述辅助放大器 PA4 的输入端之间， 以保证中心频点相位为零。 这样， 能在不改变中心频点 的相位的同时， 抵消高低频点的相位误差， 减少了功率损耗， 从而提高了输 出功率及效率， 且该相位补偿单元 6的结构十分简单， 易于实现， 其尺寸小、 性能优、 可靠性高、 生产性好， 有效地扩展了功放电路的带宽。  Preferably, if the slope characteristic of the phase compensating unit 6 satisfies the requirement, that is, the slope of the phase characteristic curve of the 1/4 wavelength microstrip line is the same, but the phase of the center frequency point is relatively close and not zero, the phase compensating unit 6 can be used. Add a small phase compensation microstrip line. The phase compensation microstrip line is connected in series with the main transmission line 61 of the phase compensation unit 6 and is connected between the output terminal of the 3dB bridge and the input terminal of the auxiliary amplifier PA4 to ensure that the phase of the center frequency is zero. In this way, the phase error of the high and low frequency points can be cancelled without changing the phase of the center frequency point, the power loss is reduced, thereby improving the output power and efficiency, and the structure of the phase compensation unit 6 is very simple and easy to implement. Small size, excellent performance, high reliability, and good productivity, effectively expanding the bandwidth of the power amplifier circuit.
本发明实施例还提出一种功率放大装置， 该功率放大装置包括上述功放 电路， 该功放电路的电路结构和原理可参照前述， 在此不再赘述。 由于釆用 了上述功放电路， 提高了输出功率及效率， 扩展了功放电路的带宽， 能满足 实际应用中基站对功率放大装置的要求。 The embodiment of the present invention further provides a power amplifying device, which includes the power amplifier circuit. The circuit structure and principle of the power amplifier circuit can be referred to the foregoing, and details are not described herein. Since the above power amplifier circuit is used, the output power and efficiency are improved, and the bandwidth of the power amplifier circuit is expanded to satisfy The requirements of the base station for the power amplifying device in practical applications.
本发明实施例又提出一种上述功率放大装置的宽带匹配方法， 该方法包 括： 先由功率分配单元 1将输入信号分配为相位差为 90。 的多路信号后分别 输出至主放大单元 2及辅助放大单元 3进行放大； 再由阻抗变换线 5针对主 放大单元 2及辅助放大单元 3放大后的多路信号的 90。 相位差进行相位对齐， 产生高低频点相位差； 通过相位补偿单元 6抵消高低频点相位差， 其中， 所 述相位补偿单元 6的相位特性与所述阻抗变换线 5的相位特性相同； 最后， 功率合成单元 4 将抵消了高低频点相位差的多路信号合成为一路信号后输 出。 较佳地， 通过相位补偿单元 6抵消高低频点相位差的步骤中， 首先获取 所述阻抗变换线 5的相位特性； 再基于所述阻抗变换线 5也即 1/4波长微带 线的相位特性通过仿真软件设置所述相位补偿单元 6中主传输线 61、 旁路微 带线 63的尺寸及旁路电容 62的电容值大小，以使所述相位补偿单元 61的相 位特性与 1/4波长微带线相同， 抵消 1/4波长微带线带来的高低频点相位差， 从而提高输出功率及效率。  The embodiment of the present invention further provides a broadband matching method for the above power amplifying device, the method comprising: first, the input signal is allocated by the power distribution unit 1 to have a phase difference of 90. The multiplexed signals are respectively output to the main amplifying unit 2 and the auxiliary amplifying unit 3 for amplification; and the impedance converting line 5 is applied to 90 of the multiplexed signals of the main amplifying unit 2 and the auxiliary amplifying unit 3. The phase difference is phase-aligned to generate a high-low frequency point phase difference; the phase compensation unit 6 cancels the high-low frequency point phase difference, wherein the phase characteristic of the phase compensation unit 6 is the same as the phase characteristic of the impedance conversion line 5; The power combining unit 4 synthesizes the multiplexed signals that cancel the phase difference of the high and low frequency points into one signal and outputs them. Preferably, in the step of canceling the phase difference of the high and low frequency points by the phase compensation unit 6, first acquiring the phase characteristic of the impedance transformation line 5; and further based on the impedance transformation line 5, that is, the phase of the 1/4 wavelength microstrip line The size of the main transmission line 61, the bypass microstrip line 63, and the capacitance value of the bypass capacitor 62 in the phase compensation unit 6 are set by the simulation software so that the phase characteristic of the phase compensation unit 61 and the 1/4 wavelength. The microstrip line is the same, which cancels the phase difference between the high and low frequencies caused by the 1/4 wavelength microstrip line, thereby improving the output power and efficiency.
上述功放电路、 功率放大装置及其宽带匹配方法， 通过在主放大单元和 / 或至少一个辅助放大单元上串联一与阻抗变换线的相位特性相同的相位补偿 单元， 来抵消阻抗变换线带来的高低频点相位差， 使功放电路整个频带内的 高低频点的相位都可以实现相位对齐， 减少了功率损耗， 从而提高了输出功 率及效率， 扩展了功放电路的带宽， 且该相位补偿单元的结构十分简单， 成 本较低。 The power amplifier circuit, the power amplifying device and the broadband matching method thereof cancel the impedance conversion line by connecting a phase compensation unit having the same phase characteristic as the impedance transformation line in series on the main amplification unit and/or the at least one auxiliary amplification unit The phase difference between the high and low frequencies makes the phase alignment of the high and low frequency points in the entire frequency band of the power amplifier circuit, which reduces the power loss, thereby improving the output power and efficiency, expanding the bandwidth of the power amplifier circuit, and the phase compensation unit The structure is very simple and the cost is low.
以上所述仅为本发明的优选实施例， 并非因此限制本发明的专利范围， 凡是利用本发明说明书及附图内容所作的等效结构或流程变换， 或直接或间 接运用在其它相关的技术领域， 均同理包括在本发明的专利保护范围内。  The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and equivalent structural or process changes made by the present specification and drawings may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.
工业实用性 Industrial applicability
本发明实施例提高了输出功率及效率， 扩展了功放电路的带宽， 且结构 十分简单， 成本较低。  The embodiment of the invention improves the output power and efficiency, expands the bandwidth of the power amplifier circuit, and has a simple structure and a low cost.

Claims

权 利 要 求 书 claims
1、 一种功放电路， 包括功率分配单元、 主放大单元、 功率合成单元以及 与所述主放大单元并联的至少一个辅助放大单元， 输入信号经所述功率分配 单元分配后分别输出至所述主放大单元及所述辅助放大单元， 经所述主放大 单元及所述辅助放大单元放大后的多路信号再经所述功率合成单元合成为一 路信号后输出， 1. A power amplifier circuit, including a power distribution unit, a main amplification unit, a power synthesis unit and at least one auxiliary amplification unit connected in parallel with the main amplification unit. The input signal is distributed by the power distribution unit and output to the main amplification unit respectively. The amplification unit and the auxiliary amplification unit, the multi-channel signals amplified by the main amplification unit and the auxiliary amplification unit are then synthesized into one signal by the power synthesis unit and then output,
者所述主放大单元与所述功率合成单元之间以及所述至少一个辅助放大单元 与所述功率合成单元之间均串联有一阻抗变换线； There is an impedance transformation line connected in series between the main amplification unit and the power synthesis unit and between the at least one auxiliary amplification unit and the power synthesis unit;
该功放电路还包括相位补偿单元， 所述相位补偿单元串联在所述主放大 单元支路上， 或串联在所述至少一个辅助放大单元支路上， 或串联在所述主 放大单元支路上以及所述至少一个辅助放大单元支路上， 所述相位补偿单元 与所述阻抗变换线的相位特性相同， 所述相位补偿单元设置为抵消所述阻抗 变换线带来的高低频点相位差。 The power amplifier circuit also includes a phase compensation unit, which is connected in series on the main amplification unit branch, or on the at least one auxiliary amplification unit branch, or on the main amplification unit branch and the On at least one auxiliary amplification unit branch, the phase compensation unit and the impedance conversion line have the same phase characteristics, and the phase compensation unit is configured to offset the phase difference between high and low frequencies brought by the impedance conversion line.
2、 根据权利要求 1所述的功放电路， 其中， 所述主放大单元的输入端与 所述功率分配单元的输出端之间、 所述主放大单元的输出端与所述功率合成 2. The power amplifier circuit according to claim 1, wherein between the input terminal of the main amplification unit and the output terminal of the power distribution unit, the output terminal of the main amplification unit and the power synthesis
3、根据权利要求 2所述的功放电路，其中，所述功率分配单元包括电桥， 所述电桥的输入端接收输入信号， 所述电桥的一路输出端与所述主放大单元 相连， 所述电桥的另一路输出端与所述辅助放大单元连接。 3. The power amplifier circuit according to claim 2, wherein the power distribution unit includes a bridge, an input end of the bridge receives an input signal, and one output end of the bridge is connected to the main amplification unit, The other output end of the bridge is connected to the auxiliary amplification unit.
4、 根据权利要求 3所述的功放电路， 其中， 所述主放大单元包括主放大 器， 所述辅助放大单元包括辅助放大器， 所述主放大器的输入端与所述电桥 的输出端之间、 所述主放大器的输出端与所述功率合成单元之间、 所述辅助 放大器的输入端与所述电桥的输出端之间， 以及所述辅助放大器的输出端与 所述功率合成单元之间， 均连接有补偿线。 4. The power amplifier circuit according to claim 3, wherein the main amplification unit includes a main amplifier, the auxiliary amplification unit includes an auxiliary amplifier, between the input terminal of the main amplifier and the output terminal of the bridge, Between the output end of the main amplifier and the power combining unit, the auxiliary Compensation lines are connected between the input terminal of the amplifier and the output terminal of the bridge, and between the output terminal of the auxiliary amplifier and the power combining unit.
5、 根据权利要求 4所述的功放电路， 其中， 所述阻抗变换线为 1/4波长 微带线， 所述 1/4波长微带线连接在所述主放大器与所述功率合成单元之间。 5. The power amplifier circuit according to claim 4, wherein the impedance conversion line is a 1/4 wavelength microstrip line, and the 1/4 wavelength microstrip line is connected between the main amplifier and the power combining unit. between.
6、 根据权利要求 4或 5所述的功放电路， 其中， 所述相位补偿单元连接 在所述电桥的输出端与所述辅助放大器的输入端之间。 6. The power amplifier circuit according to claim 4 or 5, wherein the phase compensation unit is connected between the output end of the bridge and the input end of the auxiliary amplifier.
7、 根据权利要求 6所述的功放电路， 其中， 所述相位补偿单元包括主传 输线、 旁路电容和旁路微带线， 所述主传输线的一端与所述电桥的输出端连 接， 所述主传输线的另一端经补偿线与所述辅助放大器的输入端连接； 所述 旁路电容的一端连接在所述主传输线上， 所述旁路电容的另一端接地； 所述 旁路微带线的一端连接在所述主传输线上， 所述旁路微带线的另一端接地或 悬空。 7. The power amplifier circuit according to claim 6, wherein the phase compensation unit includes a main transmission line, a bypass capacitor and a bypass microstrip line, one end of the main transmission line is connected to the output end of the bridge, so The other end of the main transmission line is connected to the input end of the auxiliary amplifier through a compensation line; one end of the bypass capacitor is connected to the main transmission line, and the other end of the bypass capacitor is grounded; the bypass microstrip One end of the line is connected to the main transmission line, and the other end of the bypass microstrip line is grounded or suspended.
8、 根据权利要求 7所述的功放电路， 其中， 所述相位补偿单元还包括相 位补偿微带线， 所述相位补偿微带线与所述主传输线串联后连接在所述电桥 的输出端与所述辅助放大器的输入端之间。 8. The power amplifier circuit according to claim 7, wherein the phase compensation unit further includes a phase compensation microstrip line, the phase compensation microstrip line is connected in series with the main transmission line and then connected to the output end of the bridge and between the input terminals of the auxiliary amplifier.
9、一种功率放大装置，包括权利要求 1至 8中任意一项所述的功放电路。 9. A power amplifier device, comprising the power amplifier circuit according to any one of claims 1 to 8.
10、 一种如权利要求 9所述的功率放大装置的宽带匹配方法， 包括： 功率分配单元将输入信号分配为相位差为 90。 的多路信号后分别输出至 主放大单元及辅助放大单元进行放大； 10. A wideband matching method for a power amplification device as claimed in claim 9, comprising: the power distribution unit allocates the input signal so that the phase difference is 90. The multi-channel signals are then output to the main amplification unit and the auxiliary amplification unit for amplification;
由阻抗变换线针对主放大单元及辅助放大单元放大后的多路信号的 90。 相位差进行相位对齐， 产生高低频点相位差； 通过相位补偿单元抵消高低频点相位差， 其中， 所述相位补偿单元的相 位特性与所述阻抗变换线的相位特性相同； 90 of the multi-channel signals amplified by the impedance conversion line for the main amplification unit and the auxiliary amplification unit. The phase difference performs phase alignment to produce phase differences between high and low frequency points; The phase difference between high and low frequency points is offset by a phase compensation unit, wherein the phase characteristics of the phase compensation unit are the same as the phase characteristics of the impedance transformation line;
功率合成单元将抵消了高低频点相位差的多路信号合成为一路信号后输 出。 The power synthesis unit synthesizes the multi-channel signals that offset the phase difference between high and low frequency points into one signal and outputs it.
11、 如权利要求 10所述的方法， 其中， 11. The method of claim 10, wherein,
所述通过相位补偿单元抵消高低频点相位差的步骤包括： 首先获取所述 阻抗变换线的相位特性； 再基于所述阻抗变换线的相位特性设置所述相位补 偿单元中主传输线、 旁路微带线的尺寸及旁路电容的电容值大小， 以使所述 相位补偿单元相位特性与 1/4波长微带线相同，抵消 1/4波长微带线带来的高 氐频点相位差。 The step of offsetting the phase difference between high and low frequency points through the phase compensation unit includes: first obtaining the phase characteristics of the impedance conversion line; and then setting the main transmission line and bypass micro in the phase compensation unit based on the phase characteristics of the impedance conversion line. The size of the strip line and the capacitance value of the bypass capacitor are such that the phase characteristics of the phase compensation unit are the same as those of the 1/4-wavelength microstrip line, thereby offsetting the phase difference at high frequency points caused by the 1/4-wavelength microstrip line.
PCT/CN2014/081879 2014-03-10 2014-07-09 Power amplifier circuit, power amplifying apparatus, and broadband matching method therefor WO2015135267A1 (en)

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