WO2021174566A1 - 平衡或差分放大器和功率放大方法、射频电路 - Google Patents

平衡或差分放大器和功率放大方法、射频电路 Download PDF

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WO2021174566A1
WO2021174566A1 PCT/CN2020/078632 CN2020078632W WO2021174566A1 WO 2021174566 A1 WO2021174566 A1 WO 2021174566A1 CN 2020078632 W CN2020078632 W CN 2020078632W WO 2021174566 A1 WO2021174566 A1 WO 2021174566A1
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radio frequency
coupler
frequency signal
signals
coupled
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PCT/CN2020/078632
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French (fr)
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顾建忠
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芯朴科技(上海)有限公司
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Publication of WO2021174566A1 publication Critical patent/WO2021174566A1/zh

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    • 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
    • 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
    • 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
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics

Definitions

  • the present invention relates to the field of wireless communication technology, and in particular to a balanced or differential amplifier, a method for power amplification of radio frequency signals, and a radio frequency circuit.
  • radio frequency power amplifiers there are balanced and differential amplifiers.
  • This type of amplifier divides the input signal into two channels and amplifies them in two single-ended amplifiers respectively, and then realizes power synthesis at the output.
  • This type of architecture can achieve higher output power, while the balanced amplifier also has performance such as insensitivity to the output load.
  • MIMO multiple input and output
  • Each transmission and reception channel has a set of independent transmission power amplifiers, switches, filters, and receiving low-noise amplifiers.
  • the current 5G mobile terminals generally require support for 2-channel upload transmission and 4-channel download reception (2T4R).
  • WiFi6 has the highest requirement to support 8-channel upload transmission and 8-channel download reception (8T8R).
  • the number of radio frequency channels and radio frequency devices has greatly increased.
  • the purpose of the present invention is to provide a balanced or differential amplifier, which saves MIMO radio frequency paths and devices and improves the transmission power.
  • An embodiment of the present application provides a balanced or differential amplifier, including:
  • Input switch wherein at least one radio frequency signal is coupled to the input switch, and one end of the input switch is coupled to the first isolation terminal;
  • a first coupler, the first and second ends of the first coupler are connected to the input switch;
  • the first power amplifier is coupled to the third end of the first coupler, and the second power amplifier is coupled to the fourth end of the first coupler;
  • a second coupler the first and second ends of the second coupler are respectively coupled to the first and second power amplifiers
  • An output switch the output switch is respectively connected to the second coupler and outputs the amplified at least one radio frequency signal to at least one radio frequency antenna, wherein one end of the output switch is coupled to the second isolation end.
  • two radio frequency signals are respectively coupled to the input switch, and the first coupler divides the two radio frequency signals into two signals with phase difference and separates the two radio frequency signals respectively.
  • the output switch respectively outputs the synthesized two radio frequency signals to a separate radio frequency antenna.
  • a radio frequency signal is coupled to the input switch, and the first coupler divides the radio frequency signal into two signals with a phase difference and outputs the two signals of the radio frequency signal to all signals respectively.
  • the first and second power amplifiers, the first and second power amplifiers respectively amplify two signals of the radio frequency signal, the second coupler respectively synthesizes the two signals of the radio frequency signal, and the output switch
  • the synthesized radio frequency signal is output to a radio frequency antenna.
  • the first coupler divides a radio frequency signal into two signals with a phase difference of 90° or 180°, and the second coupler combines the two signals with a phase difference of 90° or 180°. It is a radio frequency signal.
  • the first and second isolation terminals are coupled to the ground terminal through a resistor, a capacitor, an inductor, or a combination thereof.
  • Another embodiment of the present application also provides a method for power amplification of radio frequency signals, including:
  • Input at least one radio frequency signal to at least the input switch, and output the at least one radio frequency signal to the first and second ends of the first coupler through the input switch;
  • the first coupler decomposes at least one of the at least one radio frequency signal
  • the first and second power amplifiers are respectively used to amplify one of the at least one radio frequency signal, and output the amplified at least one radio frequency signal to the first and second ends of the second coupler;
  • the synthesized at least one radio frequency signal is respectively output to at least one radio frequency antenna through an output switch.
  • the at least one radio frequency signal is input to the first coupler with half the power, and the first coupler divides the at least one radio frequency signal into two signals with phase difference and respectively Outputting the two signals of the at least one radio frequency signal to the first and second power amplifiers, the first and second power amplifiers respectively amplifying the two signals of the at least one radio frequency signal, and the second coupling
  • the two-way signal of the at least one radio frequency signal is respectively synthesized by the device, and the output switch outputs the synthesized at least one radio frequency signal to at least one radio frequency antenna.
  • one end of the input switch is coupled to the first isolation terminal, and the first isolation terminal is coupled to the ground terminal through a resistor, a capacitor, an inductor, or a combination thereof.
  • one end of the output switch is coupled to the second isolation terminal, and the second isolation terminal is coupled to the ground terminal through a resistor, a capacitor, an inductor, or a combination thereof.
  • Another embodiment of the present application also provides a radio frequency circuit, including: the above-mentioned balanced or differential amplifier, the output switch is also connected to the first receiving branch and the second receiving branch, and the output switches respectively pass through the filter Coupled to the at least one radio frequency antenna.
  • a new type of power amplification method for radio frequency signals supporting dual antennas is proposed, which can transmit dual-frequency or 2*2 MIMO radio frequency paths and devices to reduce the front-end volume of the radio frequency module and save costs.
  • This method can be used for single-frequency, dual-frequency 1*1 or 2*2 MIMO transmission and reception, and can also be extended to multi-channel MIMO.
  • the feature A+B+C is disclosed, and in another example, the feature A+B+D+E is disclosed, and the features C and D are equivalent technical means that play the same role.
  • Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be regarded as recorded because it is technically infeasible, and A+B+ The C+E plan should be deemed to have been documented.
  • Fig. 1 is a circuit diagram of a balanced or differential amplifier in an embodiment of the present invention.
  • Fig. 2 is a schematic circuit diagram of a balanced or differential amplifier in another embodiment of the present invention.
  • Fig. 3 is a circuit diagram of a balanced or differential amplifier in another embodiment of the present invention.
  • Fig. 4 is a flowchart of a method for amplifying radio frequency signal power in an embodiment of the present invention.
  • Fig. 5 is a schematic circuit diagram of a radio frequency circuit in an embodiment of the present invention.
  • a balanced or differential amplifier is provided.
  • the balanced or differential amplifier includes:
  • Input switch 401 wherein at least one radio frequency signal is coupled to the input switch 401, and one end of the input switch 401 is coupled to the first isolation terminal;
  • a first coupler 402, the first and second ends of the first coupler 402 are connected to the input switch 401;
  • a second coupler 405, the first and second ends of the second coupler 405 are respectively coupled to the first and second power amplifiers 403, 404,
  • the output switch 406 is respectively connected to the second coupler 405 and outputs the amplified at least one radio frequency signal to at least one radio frequency antenna, wherein one end of the output switch 406 is coupled to the second Isolated end.
  • the first terminal and the second terminal of the first coupler are respectively used as signal input terminals, and the third terminal and the fourth terminal are divided into the through output terminal and the coupled output terminal, wherein the through output terminal does not have phase Shift, the coupling output has a phase shift.
  • one of the first terminal and the second terminal of the first coupler is coupled to the isolation terminal.
  • the first terminal and the second terminal of the first coupler are respectively coupled Connect two RF signals.
  • the first end and the second end of the second coupler are respectively used as two signal input ends
  • the second coupler further includes a third end and a fourth end, and the third end and the fourth end are used as a coupling output end.
  • one of the third terminal and the fourth terminal of the second coupler is coupled to the isolation terminal.
  • the third terminal and the fourth terminal of the second coupler are respectively coupled Connect two output terminals.
  • the first coupler 402 divides a radio frequency signal into two signals with a phase difference of 90° or 180°, and the radio frequency signal is divided into two signals with a half power.
  • the second coupler 405 synthesizes two signals with a phase difference of 90° or 180° into one radio frequency signal.
  • the first coupler 402 divides a radio frequency signal into two signals with a phase difference of 90°
  • the second coupler 405 divides the two signals with a phase difference of 90°.
  • the first coupler 402 divides a radio frequency signal into two signals with a phase difference of 180°
  • the second coupler 405 divides the signal with a phase difference of 180°.
  • the two signals are combined into a radio frequency signal.
  • the first and second isolation terminals are coupled to the ground terminal through a resistor, a capacitor, an inductor, or a combination thereof.
  • the first isolation terminal is coupled to the ground terminal through a resistor 407, and the resistance value of the resistor 407 is 0-100 ⁇ , such as 50 ⁇ .
  • the second isolation terminal is coupled to the ground terminal through a resistor 408, and the resistance value of the resistor 408 is 0-100 ⁇ , such as 50 ⁇ .
  • a radio frequency signal is coupled to the input switch, and the first coupler divides the radio frequency signal into two signals with a phase difference and outputs the two signals of the radio frequency signal to all signals respectively.
  • the first and second power amplifiers, the first and second power amplifiers respectively amplify two signals of the radio frequency signal, the second coupler respectively synthesizes the two signals of the radio frequency signal, and the output switch
  • the synthesized radio frequency signal is output to a radio frequency antenna.
  • the radio frequency input signal RFin A passes through the output switch 401 and enters the first coupler 402.
  • the first coupler 402 divides the input signal RFin A into two channels and inputs the first power amplifier 403 and the second power amplifier 404 respectively.
  • the signal is combined through the output power of the second coupler 405, and then output to the antenna ANT2 through the output switch 406.
  • the balanced or differential amplifier in this embodiment is basically the same as the balanced or differential amplifier in the first embodiment, except that the RF signal is coupled to different ports of the first coupler, so that the same RF signal is transmitted through different antennas.
  • the radio frequency input signal RFin A passes through the output switch 501 and enters the first coupler 502.
  • the first coupler 502 divides the input radio frequency signal into two channels and inputs the first power amplifier 503 and the second power respectively.
  • Amplifier 504 the amplified signal is combined by the output power of the second coupler 505, and then output to the first antenna ANT1 through the output switch 506.
  • the first embodiment and the second embodiment are both described with a balanced amplifier as an example.
  • both the first embodiment and the second embodiment are applicable to the differential amplifier, that is, the coupler shifts the phase of the radio frequency signal by 180°, which The same technical effect can be achieved, so I won’t repeat them here.
  • the balanced or differential amplifier of this embodiment is basically the same as the balanced or differential amplifier of the first embodiment.
  • the difference is that: two radio frequency signals are respectively coupled to the input switch, and the first coupler respectively connects the two radio frequency signals Divided into two signals with phase difference and respectively output the two signals of the two radio frequency signals to the first and second power amplifiers, and the first and second power amplifiers respectively amplify the two radio frequency signals
  • the second coupler respectively synthesizes the two signals of the two radio frequency signals
  • the output switch respectively outputs the synthesized two radio frequency signals to separate radio frequency antennas.
  • the radio frequency input signals RFin A and RFin B enter the first coupler 602 through the output switch 601, and the first coupler 602 divides the input signal into two channels and inputs the first power amplifier 603 and the second power amplifier 604 respectively.
  • the amplified signals are combined through the output power of the second coupler 605, and then output to the first antenna ANT1 and the second antenna ANT2 through the output switch 606, respectively.
  • a balanced or differential amplifier is used in a dual-frequency circuit to amplify the input signals RFin A and RFin B at the same time to achieve dual-frequency transmission, and achieve the purpose of reducing the front-end volume of the radio frequency module and saving costs.
  • This embodiment also provides a method for amplifying the power of a radio frequency signal.
  • a flowchart of the method for amplifying the power of a radio frequency signal refer to FIG. 4, and the method includes:
  • Step S101 input at least one radio frequency signal to at least an input switch, and output the at least one radio frequency signal to the first and second ends of the first coupler through the input switch;
  • Step S103 the first coupler decomposes at least one of the at least one radio frequency signal
  • Step S105 the first and second power amplifiers are respectively used to amplify one of the at least one radio frequency signal, and output the amplified at least one radio frequency signal to the first and second ends of the second coupler ;
  • Step S107 the second coupler synthesizes the amplified at least one radio frequency signal
  • step S109 the synthesized at least one radio frequency signal is respectively output to at least one radio frequency antenna through an output switch.
  • the at least one radio frequency signal is input to the first coupler with half the power, and the first coupler divides the at least one radio frequency signal into two signals with phase difference and respectively Outputting the two signals of the at least one radio frequency signal to the first and second power amplifiers, the first and second power amplifiers respectively amplifying the two signals of the at least one radio frequency signal, and the second coupling
  • the two-way signal of the at least one radio frequency signal is respectively synthesized by the device, and the output switch outputs the synthesized at least one radio frequency signal to at least one radio frequency antenna.
  • one end of the input switch is coupled to the first isolation terminal, and the first isolation terminal is coupled to the ground terminal through a resistor, a capacitor, an inductor, or a combination thereof.
  • one end of the output switch is coupled to the second isolation terminal, and the second isolation terminal is coupled to the ground terminal through a resistor, a capacitor, an inductor, or a combination thereof.
  • the radio frequency circuit includes: the above-mentioned balanced or differential amplifier. As shown in FIG. An amplifier, which includes an input switch 701, a first coupler 702, first and second power amplifiers 703, 704, a second coupler 705, and an output switch 706, which can implement the first, second, and third embodiments above The radio frequency signal amplification function in.
  • the output switch 706 is also connected to the first receiving branch and the second receiving branch, where the first receiving branch includes a first receiving signal amplifier 709 and the second receiving branch includes a second receiving signal amplifier 710.
  • the output switch 706 is respectively coupled to the at least one radio frequency antenna through a filter. Wherein, the output switch 706 is respectively coupled to the first antenna ANT1 and the second antenna ANT2 through the first filter 711 and the second filter 712, so as to realize the transmission and reception of radio frequency signals.
  • an act is performed according to a certain element, it means that the act is performed at least according to the element, which includes two cases: the act is performed only according to the element, and Perform the actions according to the elements and other elements.
  • Multiple, multiple, multiple, etc. expressions include two, two, two, and two or more, two or more, and two or more expressions.

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Abstract

本申请公开了一种平衡或差分放大器，所述射频信号大器包括输入开关，其中至少一个射频信号耦接到所述输入开关，所述输入开关的一端耦接第一隔离端；第一耦合器，所述第一耦合器的第一和第二端连接所述输入开关；第一和第二功率放大器，所述第一功率放大器耦接所述第一耦合器的第三端，所述第二功率放大器耦接所述第一耦合器的第四端；第二耦合器，所述第二耦合器的第一和第二端分别耦接所述第一和第二功率放大器，输出开关，所述输出开关分别连接所述第二耦合器，并将放大后的所述至少一个射频信号分别输出到至少一个射频天线，其中所述输出开关的一端耦接第二隔离端。

Description

平衡或差分放大器和功率放大方法、射频电路 技术领域
本发明涉及无线通信技术领域，且特别涉及一种平衡或差分放大器、射频信号的功率放大方法以及射频电路。
背景技术
在传统的射频功率放大器中，存在平衡和差分放大器，该类型放大器把输入信号分为两路，分别在两个单端放大器放大，之后再输出端实现功率合成。该类型架构可以实现更高的输出功率，同时平衡放大器还存在对输出负载不敏感等性能。在无线通信为了提高上传或者下载速率，目前普遍采用多输入输出(MIMO)方案，每一路发射接收通路，都有一套独立的发射功率放大器、开关、滤波器和接收低噪声放大器。例如目前的5G移动终端普遍要求支持2路上传发射和4路下载接收(2T4R)，WiFi6最高要求支持8路上传发射和8路下载接收(8T8R)，射频通路和射频器件数量大大增加。
发明内容
本发明的目的在于提供一种平衡或差分放大器，节省MIMO的射频通路和器件，提高发射功率。
本申请的一实施例中提供一种平衡或差分放大器，包括：
输入开关，其中至少一个射频信号耦接到所述输入开关，所述输入开关的一端耦接第一隔离端；
第一耦合器，所述第一耦合器的第一和第二端连接所述输入开关；
第一和第二功率放大器，所述第一功率放大器耦接所述第一耦合器的第 三端，所述第二功率放大器耦接所述第一耦合器的第四端；
第二耦合器，所述第二耦合器的第一和第二端分别耦接所述第一和第二功率放大器，
输出开关，所述输出开关分别连接所述第二耦合器，并将放大后的所述至少一个射频信号分别输出到至少一个射频天线，其中所述输出开关的一端耦接第二隔离端。
在一个优选例中，两个射频信号分别耦接到所述输入开关，所述第一耦合器分别将所述两个射频信号分成具有相位差的两路信号并分别将所述两个射频信号的两路信号输出到所述第一和第二功率放大器，所述第一和第二功率放大器分别放大所述两个射频信号的两路信号，所述第二耦合器分别合成所述两个射频信号的两路信号，所述输出开关分别将合成后的所述两个射频信号输出到单独的射频天线。
在一个优选例中，一个射频信号耦接到所述输入开关，所述第一耦合器将所述射频信号分成具有相位差的两路信号并分别将所述射频信号的两路信号输出到所述第一和第二功率放大器，所述第一和第二功率放大器分别放大所述射频信号的两路信号，所述第二耦合器分别合成所述射频信号的两路信号，所述输出开关将合成后的所述射频信号输出到一个射频天线。
在一个优选例中，所述第一耦合器将一路射频信号分成相位差为90°或180°的两路信号，所述第二耦合器将相位差为90°或180°的两路信号合成为一路射频信号。
在一个优选例中，所述第一和第二隔离端通过电阻器、电容器、电感器或其组合耦接到地端。
本申请的另一个实施例中还提供一种射频信号的功率放大方法，包括：
输入至少一个射频信号至少输入开关，通过所述输入开关将所述至少一个射频信号输出到第一耦合器的第一和第二端；
所述第一耦合器分解所述至少一个射频信号中的至少一个；
所述第一和第二功率放大器分别用于放大所述至少一个射频信号中的一个，并将放大后的所述至少一个射频信号输出到第二耦合器的第一和第二端；
所述第二耦合器合成所述放大后的所述至少一个射频信号；
通过输出开关分别将合成后的所述至少一个射频信号输出到至少一个射频天线。
在一个优选例中，所述至少一个射频信号以二分之一功率输入到所述第一耦合器，所述第一耦合器将所述至少一个射频信号分成具有相位差的两路信号并分别将所述至少一个射频信号的两路信号输出到所述第一和第二功率放大器，所述第一和第二功率放大器分别放大所述至少一个射频信号的两路信号，所述第二耦合器分别合成所述至少一个射频信号的两路信号，所述输出开关将合成后的所述至少一个射频信号输出到至少一个射频天线。
在一个优选例中，所述输入开关的一端耦接第一隔离端，所述第一隔离端通过电阻器、电容器、电感器或其组合耦接到地端。
在一个优选例中，所述输出开关的一端耦接第二隔离端，所述第二隔离端通过电阻器、电容器、电感器或其组合耦接到地端。
本申请的另一个实施例中还提供一种射频电路，包括：上述的平衡或差分放大器，所述输出开关还连接第一接收支路和第二接收支路，所述输出开关分别通过滤波器耦接到所述至少一个射频天线。
相对于现有技术，本申请的方法具有以下有益效果：
本申请中，提出了一种新型的支持双天线的射频信号的功率放大方法，可双频发射或2*2MIMO的射频通路和器件，起到降低射频模组前端体积和节约成本的目的。该方法可用于单频、双频1*1或2*2MIMO发射和接收，同时也可以扩展到多路MIMO。-
本申请的说明书中记载了大量的技术特征，分布在各个技术方案中，如 果要罗列出本申请所有可能的技术特征的组合(即技术方案)的话，会使得说明书过于冗长。为了避免这个问题，本申请上述发明内容中公开的各个技术特征、在下文各个实施方式和例子中公开的各技术特征、以及附图中公开的各个技术特征，都可以自由地互相组合，从而构成各种新的技术方案(这些技术方案均应所述视为在本说明书中已经记载)，除非这种技术特征的组合在技术上是不可行的。例如，在一个例子中公开了特征A+B+C，在另一个例子中公开了特征A+B+D+E，而特征C和D是起到相同作用的等同技术手段，技术上只要择一使用即可，不可能同时采用，特征E技术上可以与特征C相组合，则，A+B+C+D的方案因技术不可行而应当不被视为已经记载，而A+B+C+E的方案应当视为已经被记载。
附图说明
图1是本发明一实施例中平衡或差分放大器的电路示意图。
图2是本发明另一实施例中平衡或差分放大器的电路示意图。
图3是本发明另一实施例中平衡或差分放大器的电路示意图。
图4是本发明一实施例中射频信号的功率放大方法的流程图。
图5是本发明一实施例中射频电路的电路示意图。
具体实施方式
在以下的叙述中，为了使读者更好地理解本申请而提出了许多技术细节。但是，本领域的普通技术人员可以理解，即使没有这些技术细节和基于以下各实施方式的种种变化和修改，也可以实现本申请各项权利要求所要求保护的技术方案。
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明的实施方式作进一步地详细描述。
实施例一
本实施例中提供一种平衡或差分放大器，所述平衡或差分放大器的示意图参考图1所示，所述平衡或差分放大器包括：
输入开关401，其中至少一个射频信号耦接到所述输入开关401，所述输入开关401的一端耦接第一隔离端；
第一耦合器402，所述第一耦合器402的第一和第二端连接所述输入开关401；
第一和第二功率放大器403、404，所述第一功率放大器403耦接所述第一耦合器402的第三端，所述第二功率放大器404耦接所述第一耦合器402的第四端，
第二耦合器405，所述第二耦合器405的第一和第二端分别耦接所述第一和第二功率放大器403、404，
输出开关406，所述输出开关406分别连接所述第二耦合器405，并将放大后的所述至少一个射频信号分别输出到至少一个射频天线，其中所述输出开关406的一端耦接第二隔离端。
在一实施例中，第一耦合器的第一端和第二端分别作为信号输入端，第三端和第四端分为作为直通输出端和耦合输出端，其中，直通输出端不具有相移，耦合输出端具有相移。当用于单频器件时，第一耦合器的第一端和第二端中的一个耦接隔离端，当用于双频器件时，第一耦合器的第一端和第二端分别耦接两个射频信号。在一个实施例中，第二耦合器的第一端和第二端分别作为两个信号输入端，第二耦合器还包括第三端和第四端，第三端和第四端作为耦合输出端。当用于单频器件时，第二耦合器的第三端和第四端中的一个耦接隔离端，当用于双频器件时，第二耦合器的第三端和第四端分别耦接两个输出端。
在一个优选例中，所述第一耦合器402将一路射频信号分成相位差为90°或180°的两路信号，并且，该射频信号分别以二分之一功率分为两路信号。所述第二耦合器405将相位差为90°或180°的两路信号合成为一路 射频信号。具体的，在平衡放大器的实施例中，所述第一耦合器402将一路射频信号分成相位差为90°的两路信号，所述第二耦合器405将相位差为90°的两路信号合成为一路射频信号；在差分放大器的实施例中，所述第一耦合器402将一路射频信号分成相位差为180°的两路信号，所述第二耦合器405将相位差为180°的两路信号合成为一路射频信号。
在一个优选例中，所述第一和第二隔离端通过电阻器、电容器、电感器或其组合耦接到地端。例如，第一隔离端通过电阻器407耦接到地端，电阻器407的电阻值为0～100Ω，例如50Ω。例如，第二隔离端通过电阻器408耦接到地端，电阻器408的电阻值为0～100Ω，例如50Ω等。
在一个优选例中，一个射频信号耦接到所述输入开关，所述第一耦合器将所述射频信号分成具有相位差的两路信号并分别将所述射频信号的两路信号输出到所述第一和第二功率放大器，所述第一和第二功率放大器分别放大所述射频信号的两路信号，所述第二耦合器分别合成所述射频信号的两路信号，所述输出开关将合成后的所述射频信号输出到一个射频天线。
具体的，射频输入信号RFin A通过输出开关401，进入第一耦合器402，第一耦合器402把输入信号RFin A分成两路分别输入第一功率放大器403和第二功率放大器404，放大后的信号经过第二耦合器405输出功率合成，然后经过输出开关406输出到天线ANT2。
实施例二
本实施例的平衡或差分放大器与实施例一的平衡或差分放大器基本相同，区别在于：将射频信号耦接到第一耦合器的不同端口，使得同一射频信号通过不同的天线发射。具体的，参考图2所示，射频输入信号RFin A通过输出开关501，进入第一耦合器502，第一耦合器502把输入的射频信号分成两路分别输入第一功率放大器503和第二功率放大器504，放大后的信号经过第二耦合器505输出功率合成，然后经过输出开关506输出到第一天线 ANT1。
实施例一和实施例二均以平衡放大器为例进行说明，本领域技术人员应当理解，实施例一和实施例二均适用于差分放大器，也就是，耦合器将射频信号相移180°，其可以实现相同的技术效果，在此不做赘述。
实施例三
本实施例的平衡或差分放大器与实施例一的平衡或差分放大器基本相同，区别在于：两个射频信号分别耦接到所述输入开关，所述第一耦合器分别将所述两个射频信号分成具有相位差的两路信号并分别将所述两个射频信号的两路信号输出到所述第一和第二功率放大器，所述第一和第二功率放大器分别放大所述两个射频信号的两路信号，所述第二耦合器分别合成所述两个射频信号的两路信号，所述输出开关分别将合成后的所述两个射频信号输出到单独的射频天线。
参考图3所示，射频输入信号RFin A和RFin B通过输出开关601，进入第一耦合器602，第一耦合器602把输入信号分成两路分别输入第一功率放大器603和第二功率放大器604，放大后的信号分别经过第二耦合器605输出功率合成，然后经过输出开关606分别输出到第一天线ANT1和第二天线ANT2。本实施例中，平衡或差分放大器用于双频电路，同时放大输入信号RFin A和RFin B，实现双频发射，起到降低射频模组前端体积和节约成本的目的。
实施例四
本实施例中还提供一种射频信号的功率放大方法，射频信号的功率放大方法的流程图参考图4所示，该方法包括：
步骤S101，输入至少一个射频信号至少输入开关，通过所述输入开关将所述至少一个射频信号输出到第一耦合器的第一和第二端；
步骤S103，所述第一耦合器分解所述至少一个射频信号中的至少一个；
步骤S105，所述第一和第二功率放大器分别用于放大所述至少一个射频信号中的一个，并将放大后的所述至少一个射频信号输出到第二耦合器的第一和第二端；
步骤S107，所述第二耦合器合成所述放大后的所述至少一个射频信号；
步骤S109，通过输出开关分别将合成后的所述至少一个射频信号输出到至少一个射频天线。
在一个优选例中，所述至少一个射频信号以二分之一功率输入到所述第一耦合器，所述第一耦合器将所述至少一个射频信号分成具有相位差的两路信号并分别将所述至少一个射频信号的两路信号输出到所述第一和第二功率放大器，所述第一和第二功率放大器分别放大所述至少一个射频信号的两路信号，所述第二耦合器分别合成所述至少一个射频信号的两路信号，所述输出开关将合成后的所述至少一个射频信号输出到至少一个射频天线。
在一个优选例中，所述输入开关的一端耦接第一隔离端，所述第一隔离端通过电阻器、电容器、电感器或其组合耦接到地端。
在一个优选例中，所述输出开关的一端耦接第二隔离端，所述第二隔离端通过电阻器、电容器、电感器或其组合耦接到地端。
实施例五
本实施例中还提供一种射频电路，该射频电路包括：上述的平衡或差分放大器，参考图5所示，该平衡或差分放大器可以是上述实施例一、实施例二、实施例三中的放大器，其包括输入开关701、第一耦合器702、第一和第二功率放大器703、704、第二耦合器705、输出开关706，其可以实现上述实施例一、实施例二、实施例三中的射频信号放大功能。所述输出开关706还连接第一接收支路和第二接收支路，其中，第一接收支路包括第一接收信号放大器709，第二接收支路包括第二接收信号放大器710。所述输出开关 706分别通过滤波器耦接到所述至少一个射频天线。其中，输出开关706通过第一滤波器711和第二滤波器712分别耦接到第一天线ANT1和第二天线ANT2，实现射频信号的发射和接收。
需要说明的是，在本专利的申请文件中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。本专利的申请文件中，如果提到根据某要素执行某行为，则是指至少根据所述要素执行所述行为的意思，其中包括了两种情况：仅根据所述要素执行所述行为、和根据所述要素和其它要素执行所述行为。多个、多次、多种等表达包括2个、2次、2种以及2个以上、2次以上、2种以上。
在本说明书提及的所有文献都被认为是整体性地包括在本申请的公开内容中，以便在必要时可以作为修改的依据。此外应理解，以上所述仅为本说明书的较佳实施例而已，并非用于限定本说明书的保护范围。凡在本说明书一个或多个实施例的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本说明书一个或多个实施例的保护范围之内。
在一些情况下，在权利要求书中记载的动作或步骤可以按照不同于实施例中的顺序来执行并且仍然可以实现期望的结果。另外，在附图中描绘的过程不一定要求示出的特定顺序或者连续顺序才能实现期望的结果。在某些实施方式中，多任务处理和并行处理也是可以的或者可能是有利的。

Claims (10)

  1. 一种平衡或差分放大器，其特征在于，包括：
    输入开关，其中至少一个射频信号耦接到所述输入开关，所述输入开关的一端耦接第一隔离端；
    第一耦合器，所述第一耦合器的第一和第二端连接所述输入开关；
    第一和第二功率放大器，所述第一功率放大器耦接所述第一耦合器的第三端，所述第二功率放大器耦接所述第一耦合器的第四端；
    第二耦合器，所述第二耦合器的第一和第二端分别耦接所述第一和第二功率放大器；
    输出开关，所述输出开关分别连接所述第二耦合器，并将放大后的所述至少一个射频信号分别输出到至少一个射频天线，其中所述输出开关的一端耦接第二隔离端。
  2. 如权利要求1所述的平衡或差分放大器，其特征在于，两个射频信号分别耦接到所述输入开关，所述第一耦合器分别将所述两个射频信号分成具有相位差的两路信号并分别将所述两个射频信号的两路信号输出到所述第一和第二功率放大器，所述第一和第二功率放大器分别放大所述两个射频信号的两路信号，所述第二耦合器分别合成所述两个射频信号的两路信号，所述输出开关分别将合成后的所述两个射频信号输出到单独的射频天线。
  3. 如权利要求1所述的平衡或差分放大器，其特征在于，一个射频信号耦接到所述输入开关，所述第一耦合器将所述射频信号分成具有相位差的两路信号并分别将所述射频信号的两路信号输出到所述第一和第二功率放大器，所述第一和第二功率放大器分别放大所述射频信号的两路信号，所述第二耦合器分别合成所述射频信号的两路信号，所述输出开关将合成后的所述射频信号输出到一个射频天线。
  4. 如权利要求1或2或3所述的平衡或差分放大器，其特征在于，所述 第一耦合器将一路射频信号分成相位差为90°或180°的两路信号，所述第二耦合器将相位差为90°或180°的两路信号合成为一路射频信号。
  5. 如权利要求1所述的平衡或差分放大器，其特征在于，所述第一和所述第二隔离端通过电阻器、电容器、电感器或其组合耦接到地端。
  6. 一种射频信号的功率放大方法，其特征在于，包括：
    输入至少一个射频信号至少输入开关，通过所述输入开关将所述至少一个射频信号输出到第一耦合器的第一和第二端；
    所述第一耦合器分解所述至少一个射频信号中的至少一个；
    所述第一和第二功率放大器分别用于放大所述至少一个射频信号中的一个，并将放大后的所述至少一个射频信号输出到第二耦合器的第一和第二端；
    所述第二耦合器合成所述放大后的所述至少一个射频信号；
    通过输出开关分别将合成后的所述至少一个射频信号输出到至少一个射频天线。
  7. 如权利要求6所述的射频信号的功率放大方法，其特征在于，所述至少一个射频信号以二分之一功率输入到所述第一耦合器，所述第一耦合器将所述至少一个射频信号分成具有相位差的两路信号并分别将所述至少一个射频信号的两路信号输出到所述第一和第二功率放大器，所述第一和第二功率放大器分别放大所述至少一个射频信号的两路信号，所述第二耦合器分别合成所述至少一个射频信号的两路信号，所述输出开关将合成后的所述至少一个射频信号输出到至少一个射频天线。
  8. 如权利要求6所述的射频信号的功率放大方法，其特征在于，所述输入开关的一端耦接第一隔离端，所述第一隔离端通过电阻器、电容器、电感器或其组合耦接到地端。
  9. 如权利要求6所述的射频信号的功率放大方法，其特征在于，所述输出开关的一端耦接第二隔离端，所述第二隔离端通过电阻器、电容器、电感 器或其组合耦接到地端。
  10. 一种射频电路，包括：如权利要求1～5中任意一项所述的平衡或差分放大器，所述输出开关还连接第一接收支路和第二接收支路，所述输出开关分别通过滤波器耦接到所述至少一个射频天线。
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