WO2012088798A1 - 功率放大电路及移动终端 - Google Patents

功率放大电路及移动终端 Download PDF

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Publication number
WO2012088798A1
WO2012088798A1 PCT/CN2011/071608 CN2011071608W WO2012088798A1 WO 2012088798 A1 WO2012088798 A1 WO 2012088798A1 CN 2011071608 W CN2011071608 W CN 2011071608W WO 2012088798 A1 WO2012088798 A1 WO 2012088798A1
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WO
WIPO (PCT)
Prior art keywords
power
switch
output
circuit
amplifier
Prior art date
Application number
PCT/CN2011/071608
Other languages
English (en)
French (fr)
Inventor
田晓光
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2012088798A1 publication Critical patent/WO2012088798A1/zh

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
    • 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
    • H03F1/0277—Selecting one or more amplifiers from a plurality of 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
    • 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
    • H03F3/72—Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/408—Indexing scheme relating to amplifiers the output amplifying stage of an amplifier comprising three power stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/72—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H03F2203/7227—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal the gated amplifier being switched on or off by a switch in the supply circuit of the amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/72—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H03F2203/7231—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal the gated amplifier being switched on or off by putting into cascade or not, by choosing between amplifiers by one or more switch(es)
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/72—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H03F2203/7239—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers and shunting lines by one or more switch(es)

Definitions

  • the present invention relates to the field of communications, and in particular to a power amplifying circuit and a mobile terminal.
  • the terminal transmitter adjusts the transmission power according to an instruction of the base station side, and the purpose of the adjustment is to match the transmitted signal power of the terminal with the received base station signal. For example, when the terminal detects that the base station signal is strong through the receiver, it indicates that the path loss from the terminal to the base station is small, and the terminal can work with a smaller transmit power, and vice versa. This can avoid long-term high-power transmission, reduce the operating current of the power amplifier, save battery power, and improve the standby time of the terminal.
  • FIG. 1 is a schematic diagram of a power amplifying circuit of a communication terminal according to the related art, as shown in FIG. Whether the terminal needs to output large power or output small power, the path of the signal is always input from the input of the first stage amplifier and output from the output stage of the final stage amplifier.
  • the main object of the present invention is to provide a power amplifying circuit and a mobile terminal to solve the above problems.
  • a power amplifying circuit including a cascaded power amplifier, further comprising: a first switch and a second switch, wherein at least one of the power amplifiers passes the The first switch is connected to the power source, the first switch is configured to turn on or off the power amplifier connected thereto, wherein the first switch is turned on or off according to the control signal; and the amplifier connected to the first switch
  • the input port and the output port are respectively provided with an output circuit, and the second switch is set to select an output circuit.
  • each of the power amplifiers is connected to the power source through one of the first switches; the output ports of each of the power amplifiers are separately provided with an output circuit, and the second switch The user selects the output circuit.
  • each of the power amplifiers in the power amplifier is grouped, and at least one set of power amplifiers is connected to the power source through one of the first switches, wherein one set of power amplifiers comprises one or more stages of power amplifiers;
  • An input circuit and an output port of a group of power amplifiers connected to the first switch are provided with an output circuit, and the second switch is configured to select an output circuit.
  • the output circuit comprises a matching circuit.
  • the control signal is issued by a baseband processor.
  • the first switch and the second switch are radio frequency switches.
  • the first switch is turned on or off by a control signal, and the second switch selects an output circuit according to the control signal.
  • a mobile terminal comprising the above power amplifying circuit.
  • the output circuit of the power amplifying circuit includes a matching circuit.
  • the power amplifier circuit of the present invention includes: a cascaded power amplifier, further comprising: a first switch and a second switch, wherein at least one of the power amplifiers is connected to the power source through the first switch, first The switch is configured to turn on or off the power amplifier connected thereto, wherein the first switch is turned on or off according to the control signal; the input port and the output port of the amplifier connected to the first switch are respectively provided with an output circuit, and the second The switch is set to select the output circuit.
  • FIG. 1 is a schematic diagram of a power amplifying circuit of a communication terminal according to the related art
  • 2 is a schematic diagram of a power amplification circuit in accordance with an embodiment of the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
  • a power amplifying circuit is provided.
  • the power amplifying circuit can be located in a mobile terminal.
  • the power amplifying circuit includes a cascaded power amplifier, and further includes: a first switch and a second switch (eg, a radio frequency switch) Wherein the at least one power amplifier of the power amplifier is connected to the power source through the first switch, the first switch is configured to turn on or off the power amplifier connected thereto, wherein the first switch is turned on or off according to the control signal;
  • the input port and the output port of the amplifier to which the first switch is connected are respectively provided with an output circuit, and the second switch is set to select an output circuit.
  • control signals for controlling the first switch and the second switch may be the same control signal, and of course, different control signals may be used for separate control.
  • a switch is arranged on at least one stage of the power amplifier. For example, considering that the power amplifier is cascaded, the switch can be set on the first or multi-stage power amplifier closest to the total output terminal, so that Turning off the one-stage or multi-stage power amplifier changes the power consumption of each power amplifier in each stage of the related art, thereby achieving the purpose of power saving.
  • the power amplifier of one or more stages can be turned off, a smaller power output can be realized.
  • each stage power amplifier in the power amplifying circuit may be respectively connected to the power source through a first switch; the output ports of each level of the power amplifier are separately provided Output circuit.
  • the individual outputs of the stages enable the power amplifiers to output different levels of power, each of which represents the maximum output power of the respective level, and the number of amplifiers is proportional to the level of the output signal that can be supplied, ie the number of amplifiers cascaded. The more the output signal level that can be supplied, the more.
  • a separate switching circuit and corresponding control signals control its output to selectively output according to the needs of the terminal.
  • the power amplifier circuit supplies power to the amplifiers participating in the amplification according to the operation of the amplifiers of the respective stages, and powers off the amplifiers that do not participate in the amplification, and switches the power supply of each cascade amplifier to turn on and off to achieve small signal output. Power saving function in the case of power.
  • the power amplifiers can also be grouped and controlled by a switch for different groups, for example, each power amplifier in the power amplifier is grouped, at least one group
  • the power amplifier is connected to the power source through a first switch, wherein the set of power amplifiers comprises one or more stages of power amplifiers; the input ports and the output ports of the set of power amplifiers connected to the first switch are provided with output circuits, second The switch is set to select the output circuit.
  • the output circuit includes matching circuits, each of which has matching circuits of respective characteristics to ensure stability of all output signals.
  • the control signal can be issued by the baseband processor.
  • the baseband processor can be used to control the single-pole multi-throw switch, and the output signal level of the power amplifier is controlled according to the requirements of the whole machine, and the corresponding output port is controlled by the signal level, thereby achieving the power output required by the whole machine.
  • the following is an example of a power amplifier integrated with a three-stage cascade amplifier. This embodiment provides an extension 41 of a power amplifier of a wireless communication terminal, a structure, and a related control circuit. The power amplifier can save current in a small signal mode.
  • the wireless data terminal power amplifier in this embodiment includes the following modules: A, a power amplification link, and a main power output channel. B. The matching circuit that is output separately at each stage of the link. C. Control the switching circuits of the individual outputs of the stages and the corresponding control signals. D. Amplify the power supply control switch (ie, the first switch) of each level and the corresponding control circuit.
  • the power amplification link and the main power output channel are responsible for achieving the maximum output power level level
  • the matching circuits of the individual outputs on the link are responsible for realizing the output sub-level and the output matching of the amplifier when the power output is lower than the sub-level.
  • the switching circuits that control the individual outputs of the stages and the corresponding control signals are responsible for controlling the various output levels of the power.
  • the power supply control switches of the amplification link and the corresponding control circuits are responsible for powering the amplifiers participating in the amplification according to the operation of the amplifiers of the respective stages, and powering off the amplifiers that do not participate in the amplification.
  • the 1 area is a simplified block diagram of the integrated power amplifier.
  • the 2 area is the amplified link of the signal, and the power amplification of the signal is still completed by the circuit in this area, but it can be seen that the amplification link different from the related art in FIG. 1 does not only have the main function.
  • Rate output channel the output of this area from the input port and the output of each stage amplifier has a separate output port and matching circuit to adapt to their respective characteristics.
  • the RF switch is used to select the output of the entire power amplifier. This design can not only achieve the maximum. Output power level level, also allows the amplifier link to output from different cascades according to different output levels.
  • the third stage is bypassed, and at the same time
  • the power to the three-stage amplifier is cut off, and the current of the integrated amplifier is reduced compared to the operation of each stage of the conventional integrated power amplifier to save current.
  • the level of topology of the conventional power amplifier is changed in parallel for each cascaded individual output and all cascaded outputs. Each output represents the maximum output power of the respective level.
  • the number of amplifiers cascaded is proportional to the level of the output signal that can be supplied. The more the number of amplifiers cascaded, the more output signal levels are available.
  • the 3 area is a separate matching circuit for each stage.
  • the power amplifier can work normally at various output levels, ensuring the stability of all output signals.
  • the circuit is safe and stable.
  • the 4 area provides a control switch circuit for the amplification link according to the output power required by the terminal, the switch circuit includes a second switch for controlling the individual output of each stage and a corresponding control signal, and controls the power of the second switch control level of each level separately outputted.
  • the output control signal is sent by the baseband processor, and the single-pole multi-throw switch controlled by the baseband processor controls the output signal level of the power amplifier according to the requirements of the whole machine; and the first switch of the power supply control of the amplification link and the corresponding control are also included.
  • an amplifier power on/off switch controlled by the same control signal controls the power supply of each stage of the amplifier, that is, according to the operation of each stage of the amplifier, powers the amplifier participating in the amplification, and powers off the amplifier that does not participate in the amplification, In order to complete the function of dynamic descending working current.
  • the power detection circuit is not integrated in the early power amplifier.
  • the provision of power detection is a trend in power amplifiers.
  • the above embodiment solves the problem that the power amplifier consumes a large amount of power per stage, thereby achieving the effect of power saving.
  • the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed among multiple computing devices.
  • the network may be implemented by program code executable by the computing device, so that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps It is made into a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Description

功率放大电路及移动终端 技术领域 本实用新型涉及通信领域， 具体而言， 涉及一种功率放大电路及移动终 端。 背景技术 当无线通信终端 （或称为移动终端） 正常工作时， 终端发信机上会根据 基站侧的指令调整发射功率， 这种调整的目的是让终端的发射信号功率和接 收到的基站信号匹配， 例如， 终端通过接收机检测到基站信号较强时， 说明 终端到基站的路径损耗较小， 终端可以用较小的发射功率工作， 反之亦然。 这样可以避免长时间的大功率发射， 减小功率放大器的工作电流， 节约电池 电量， 提高终端的待机时间。 同时一方面减小发射功率， 在自千扰系统中可 以减小对其他用户的千^ L, 使基站容量增加； 另一方面在非自千^ L系统中， 减小相邻小区的互相千扰。 通常在这种通信终端上使用的功率放大器的设计 釆用两级或两级以上的数量的放大器级联并集成， 图 1是根据相关技术的通 信终端功率放大电路的示意图， 如图 1所示， 无论终端需要输出大的功率还 是输出小的功率， 信号的路径总是由第一级放大器的输入端输入， 从末级放 大器输出级输出。 因此， 所带来的问题是， 当需要小的输出功率时， 整个功 放器件的增益不变，输入信号会调节得更小， 以适应最终需要的小功率输出， 但是每一级放大器依然工作， 这样耗电量依然会比较大。 实用新型内容 本实用新型的主要目的在于提供一种功率放大电路及移动终端， 以解决 上述问题。 根据本实用新型的一个方面， 提供了一种功率放大电路， 包括级联的功 率放大器， 还包括： 第一开关和第二开关， 其中， 所述功率放大器中的至少 一级功率放大器通过所述第一开关连接至电源， 所述第一开关设置为开启或 关断与其连接的功率放大器， 其中， 所述第一开关根据控制信号进行开启或 关断； 与所述第一开关连接的放大器的输入端口和输出端口分别设置有输出 电路， 所述第二开关设置为选择输出电路。 优选地， 所述功率放大器中的每一级功率放大器分别通过一个所述第一 开关连接至所述电源； 所述每一级功率放大器的输出端口均单独设置有输出 电路， 所述第二开关用户选择输出电路。 优选地， 将所述功率放大器中的每级功率放大器进行分组， 至少一组功 率放大器通过一个所述第一开关连接至所述电源， 其中， 一组功率放大器包 括一级或多级功率放大器； 与所述第一开关连接的一组功率放大器的输入端 口和输出端口均设置有输出电路， 所述第二开关设置为选择输出电路。 优选地， 所述输出电路包括匹配电路。 优选地， 所述控制信号由基带处理器发出。 优选地， 所述第一开关和所述第二开关为射频开关。 优选地， 所述第一开关 居控制信号进行开启或关断， 并且， 所述第二 开关根据所述控制信号选择输出电路。 才艮据本实用新型的另一方面， 还提供了一种移动终端， 包括上述的功率 放大电路。 优选地， 所述功率放大电路的所述输出电路包括匹配电路。 本实用新型， 釆用的功率放大电路包括： 级联的功率放大器， 还包括： 第一开关和第二开关， 其中， 功率放大器中的至少一级功率放大器通过第一 开关连接至电源， 第一开关设置为开启或关断与其连接的功率放大器， 其中， 所述第一开关根据控制信号进行开启或关断； 与第一开关连接的放大器的输 入端口和输出端口分别设置有输出电路， 第二开关设置为选择输出电路。 解 决了相关技术中功率放大器每级都工作耗电量大的问题， 进而达到了省电的 效果。 附图说明 此处所说明的附图用来提供对本实用新型的进一步理解， 构成本申请的 一部分， 本实用新型的示意性实施例及其说明用于解释本实用新型， 并不构 成对本实用新型的不当限定。 在附图中： 图 1是根据相关技术的通信终端功率放大电路的示意图； 图 2是根据本实用新型实施例的功率放大电路的示意图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本实用新型。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组合。 在本实施例中， 提供了一种功率放大电路， 该功率放大电路可以位于移 动终端中， 功率放大电路包括级联的功率放大器， 还包括： 第一开关和第二 开关（例如， 射频开关）， 其中， 功率放大器中的至少一级功率放大器通过第 一开关连接至电源， 第一开关设置为开启或关断与其连接的功率放大器， 其 中， 第一开关根据控制信号进行开启或关断； 与第一开关连接的放大器的输 入端口和输出端口分别设置有输出电路， 第二开关设置为选择输出电路。 需要说明的是， 控制第一开关和第二开关的控制信号可以是同一控制信 号， 当然也可以釆用不同的控制信号来进行分别控制。 通过上述功率放大电路， 在至少一级功率放大器上设置了开关， 例如， 考虑到功率放大器是级联的， 因此， 可以在最靠近总输出端的一级或多级功 率放大器上设置开关， 这样可以关闭一级或多级功率放大器， 从而改变了相 关技术中所有的功率放大器每级都工作耗电量大的问题， 进而达到了省电的 目的。 另外， 与相关技术相比， 由于可以关闭一级或多级的功率放大器， 从 而可以实现更小的功率输出。 优选地， 在实施时， 为了更好的对功率放大器进行控制， 可以在功率放 大电路中每一级功率放大器分别通过一个第一开关连接至电源； 每一级功率 放大器的输出端口均单独设置有输出电路。 这样， 各级单独输出实现了功率 放大器以不同等级的功率输出， 每一种输出代表各自等级的最大输出功率， 放大器的级联数量和可提供的输出信号电平成正比， 即放大器的级联数量越 多， 可提供的输出信号电平也越多。 单独的开关电路及相应的控制信号对其 输出进行控制， 从而达到根据终端需要有选择地进行输出。 功率放大电路根 据各级放大器的工作情况， 给参与放大的放大器供电， 给不参与放大的放大 器断电， 釆用开关控制每一级联放大器的电源的开启和关断， 以达到在小信 号输出功率的情况下的省电功能。 当然， 优选地， 还可以对功率放大器进行分组， 对不同的组釆用一个开 关进行控制， 例如， 将功率放大器中的每级功率放大器进行分组， 至少一组 功率放大器通过一个第一开关连接至电源， 其中， 一组功率放大器包括一级 或多级功率放大器； 与第一开关连接的一组功率放大器的输入端口和输出端 口均设置有输出电路， 第二开关设置为选择输出电路。 优选地，输出电路包括匹配电路，每一种输出都有各自特性的匹配电路， 以保障所有输出信号的稳定性。 优选地， 为了方便功率放大器有选择地进行功率输出， 控制信号可以由 基带处理器发出。 优选地， 可以釆用基带处理器控制单刀多掷开关， 并才艮据 整机的需求控制功率放大器的输出信号电平， 由信号电平控制对应的输出端 口， 从而达到整机需要的功率输出。 以下以三级级联放大器集成的功率放大器为例说明， 本实施例提供了无 线通信终端的功率放大器的拓 41、结构以及相关控制电路， 釆用该功率放大器 可以在小信号模式下节约电流， 延长整机的待机时间和通话时间。 本实施例中的无线数据终端功率放大器包括以下模块： A、 功率放大链 路和主功率输出通道。 B、 链路上各级单独输出的匹配电路。 C、 控制各级单 独输出的开关电路以及相应的控制信号。 D、放大链路各级供电控制开关（即 第一开关） 以及相应的控制电路。 其中， 功率放大链路和主功率输出通道负 责实现最大的输出功率电平等级， 链路上各级单独输出的匹配电路负责实现 输出次等级以及更次等级以下的功率输出时放大器的输出匹配。 控制各级单 独输出的开关电路以及相应的控制信号负责实现功率的各输出等级的控制。 放大链路各级供电控制开关以及相应的控制电路负责实现根据各级放大器的 工作情况， 给参与放大的放大器供电， 给不参与放大的放大器断电。 通过上述实施例，有效地解决了功率放大器每级都工作耗电量大的问题， 减少工作电流， 增加无线终端待机和通话时间， 并且， 减小发热量， 降氐无 线终端的温度。 图 2是根据本实用新型实施例的功率放大电路的示意图， 下面结合图 2 进行说明。
1区域为集成功率放大器内部简略框图。
2区域为信号的放大链路， 信号的功率放大作用仍然由这一区域的电路 完成， 但是可以看到， 不同于图 1中相关技术的放大链路， 即不只是有主功 率输出通道， 本区域从输入端口以及每一级放大器的输出都单独还有一个输 出端口及适应各自特性的匹配电路， 用射频开关来选择整个功率放大器的输 出， 这样的设计不仅可以实现最大的输出功率电平等级， 还可以让功放链路 根据不同的输出电平从不同的级联上输出， 比如， 如果选择从 PA2的输出端 口输出放大的信号， 那么第三级被旁路， 同时第三级放大器的电源被切断， 集成放大器的电流比起传统的集成功率放大器的每一级都工作时下降， 达到 节约电流的作用。 改变传统功率放大器的各级联拓朴为每一级联单独输出和 全部级联输出并行。 每一种输出代表各自等级的最大输出功率， 放大器的级 联数量和可提供的输出信号电平成正比， 即放大器的级联数量越多， 可提供 的输出信号电平也越多。
3区域为各级单独输出的匹配电路， 负责实现输出次等级以及更次等级 以下的功率输出时， 功率放大器能够以各种输出电平正常工作， 保障了所有 输出的信号的稳定性， 实现了电路的安全、 稳定。
4区域根据终端需要的输出功率给放大链路提供控制的开关电路， 开关 电路包括控制各级单独输出的第二开关以及相应的控制信号， 控制各级单独 输出的第二开关控制各级的功率输出， 控制信号由基带处理器发出， 基带处 理器控制的单刀多掷开关根据整机的需求控制功率放大器的输出信号电平； 还包括放大链路各级供电控制的第一开关以及相应的控制电路， 由同一个控 制信号控制的放大器电源开启 /关断开关控制每一级的放大器电源， 即， 根据 各级放大器的工作情况， 给参与放大的放大器供电， 给不参与放大的放大器 断电， 以便完成动态降氏工作电流的功能。
5区域辅助功能， 包括放大链路末级匹配以及常用的功率检测电路， 功 率检测电路在早期的功率放大器中没有集成。 功率检测这个功能的提供是功 率放大器的潮流。 通过上述实施例解决了功率放大器每级都工作耗电量大的问题， 进而达 到了省电的效果。 显然， 本领域的技术人员应该明白， 上述的本实用新型的各模块或各步 骤可以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者 分布在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行 的程序代码来实现， 从而可以将它们存储在存储装置中由计算装置来执行， 或者将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤 制作成单个集成电路模块来实现。 这样， 本实用新型不限制于任何特定的硬 件和软件结合。 以上所述仅为本实用新型的优选实施例而已，并不用于限制本实用新型， 对于本领域的技术人员来说， 本实用新型可以有各种更改和变化。 凡在本实 用新型的精神和原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含 在本实用新型的保护范围之内。

Claims

权 利 要 求 书
1. 一种功率放大电路， 包括级联的功率放大器， 还包括： 第一开关和第 二开关， 其中，
所述功率放大器中的至少一级功率放大器通过所述第一开关连接 至电源， 所述第一开关设置为开启或关断与其连接的功率放大器， 其 中， 所述第一开关根据控制信号进行开启或关断；
与所述第一开关连接的放大器的输入端口和输出端口分别设置有 输出电路， 所述第二开关设置为选择输出电路。
2. 根据权利要求 1所述的功率放大电路， 其中， 所述功率放大器中的每 一级功率放大器分别通过一个所述第一开关连接至所述电源； 所述每 一级功率放大器的输出端口均单独设置有输出电路， 所述第二开关用 户选择输出电路。
3. 根据权利要求 1所述的功率放大电路， 其中， 将所述功率放大器中的 每级功率放大器进行分组， 至少一组功率放大器通过一个所述第一开 关连接至所述电源， 其中， 一组功率放大器包括一级或多级功率放大 器； 与所述第一开关连接的一组功率放大器的输入端口和输出端口均 设置有输出电路， 所述第二开关设置为选择输出电路。
4. 根据权利要求 1至 3中任一项所述的功率放大电路， 其中， 所述输出 电路包括匹配电路。
5. 根据权利要求 1至 3中任一项所述的功率放大电路， 其中， 所述控制 信号由基带处理器发出。
6. 根据权利要求 1至 3中任一项所述的功率放大电路， 其中， 所述第一 开关和所述第二开关为射频开关。
7 根据权利要求 1至 3中任一项所述的功率放大电路， 其中， 所述第一 开关根据控制信号进行开启或关断， 并且， 所述第二开关根据所述控 制信号选择输出电路。
8. —种移动终端， 包括权利要求 1至 3中任一项所述的功率放大电路。 据权利要求 8所述的移动终端， 其中， 所述功率放大电路的所述输 出电路包括匹配电路。
PCT/CN2011/071608 2010-12-27 2011-03-08 功率放大电路及移动终端 WO2012088798A1 (zh)

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