WO2018161678A1 - 一种功率控制电路及功率放大电路 - Google Patents

一种功率控制电路及功率放大电路 Download PDF

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Publication number
WO2018161678A1
WO2018161678A1 PCT/CN2017/117145 CN2017117145W WO2018161678A1 WO 2018161678 A1 WO2018161678 A1 WO 2018161678A1 CN 2017117145 W CN2017117145 W CN 2017117145W WO 2018161678 A1 WO2018161678 A1 WO 2018161678A1
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Prior art keywords
voltage
power
output
control circuit
power control
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PCT/CN2017/117145
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English (en)
French (fr)
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苏强
徐柏鸣
奕江涛
李阳
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广州慧智微电子有限公司
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Publication of WO2018161678A1 publication Critical patent/WO2018161678A1/zh
Priority to US16/411,095 priority Critical patent/US10862432B2/en

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • 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
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • 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
    • H03F1/0261—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A
    • H03F1/0272—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A by using a signal derived from the output signal
    • 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
    • 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
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • 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
    • H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
    • 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
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/516—Some amplifier stages of an amplifier use supply voltages of different value

Definitions

  • the present invention relates to the field of electronic technologies, and in particular, to a power control circuit and a power amplifying circuit.
  • RF power amplifiers have a wide range of applications in the field of communications, such as the power amplifier in the Global 2nd Generation (2G) mobile communication technology Global System for Mobile Communication (GSM), which is a power amplifier.
  • 2G Global 2nd Generation
  • GSM Global System for Mobile Communication
  • 3GPP 3rd Generation Partnership Project
  • PVT power time template
  • Signal Vramp voltage control when the RF signal input from the RF input port RF IN is amplified and outputted by the RF output port RF OUT, the commonly used implementation method is: controlling the collector voltage Vcc of the power amplifier with a closed loop circuit to make the collector voltage Vcc is proportional to the output power control signal Vramp, and the output power of the power amplifier is changed with the output power control signal Vramp.
  • This method is called a voltage control method.
  • the collector output voltage value information of the power transistor M1 is fed back to the positive input terminal of the differential amplifier OP through the sampling circuit, and the power transistor is driven after the difference is compared with the output power control signal Vramp voltage.
  • the M1 output voltage Vout is used as the collector voltage of the power amplifier, and the collector voltage of the power amplifier is the collector voltages Vcc1, Vcc2 of the driver stage of the power amplifier and the collector voltage Vcc3 of the amplification stage of the power amplifier.
  • an embodiment of the present invention provides a power control circuit and a power amplifying circuit.
  • An embodiment of the present invention provides a power control circuit, where the power control circuit includes a voltage control circuit and a current control circuit.
  • the voltage control circuit is configured to detect an input output power control signal, convert the output power control signal into a control voltage, and output the control voltage to a driving stage of a power amplifier connected to the power control circuit;
  • the current control circuit is configured to detect an input output power control signal, convert the output power control signal into a control current, and output to an amplification stage of the power amplifier.
  • control voltage is output to each stage of the driver stage of the power amplifier including at least one stage of the driver stage.
  • the voltage control circuit includes a first shaping circuit and a voltage regulator, and the first shaping circuit and the voltage regulator are configured to convert the output power control signal into a control voltage.
  • control voltage output by the voltage control circuit is positively correlated with the input output power control signal voltage when the output power control signal is greater than a preset first threshold and less than a preset second threshold.
  • the voltage control circuit further includes a clamp circuit configured to perform voltage clamping on the output power control signal when the output power control signal exceeds a preset second threshold.
  • the current control circuit includes a voltage current converter, an error amplifier, and a power transistor;
  • the voltage current converter is configured to convert an input voltage into a first output current
  • the error amplifier and the power transistor are configured to convert the first output current into a control current.
  • the first control current output by the voltage current converter is positively correlated with the input output power control signal voltage when the output power control signal is greater than a preset third threshold.
  • the current control circuit further includes a second shaping circuit configured to shape the output power control signal.
  • the power control circuit further includes a resistor connected to the power source at one end, and the other end of the resistor is simultaneously connected to the negative input terminal of the error amplifier and the collector of the power amplifier amplification stage.
  • An embodiment of the present invention provides a power amplifying circuit, where the power amplifying circuit includes a power amplifier and a power control circuit in the foregoing technical solution;
  • the power control circuit is coupled to the power amplifier and configured to input a control voltage and a control current to the power amplifier;
  • the power amplifier is configured to perform corresponding amplification processing on the input radio frequency signal according to the control voltage and the control current, and then output.
  • the power control circuit and the power amplifying circuit provided by the embodiments of the present invention use a voltage control circuit and a current control circuit to convert an input power control signal into a control voltage and a control current, and output to a driving stage and an amplification stage of the power amplifier to control the power amplifier.
  • a voltage control circuit and a current control circuit to convert an input power control signal into a control voltage and a control current, and output to a driving stage and an amplification stage of the power amplifier to control the power amplifier.
  • FIG. 1 is a schematic diagram showing the circuit structure of a power amplifying circuit in the related art
  • FIG. 2 is a schematic structural diagram of a circuit of a power amplifying circuit according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic structural diagram of a circuit of a power amplifying circuit according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic diagram showing relationship between output voltage and input voltage of a voltage control circuit according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram showing the relationship between output current and input voltage of a voltage current converter according to an embodiment of the present invention.
  • a power control circuit provided by an embodiment of the present invention includes a voltage control circuit and a current control circuit.
  • the voltage control circuit is configured to detect an input.
  • the output power control signal Vramp converts the output power control signal Vramp into the control voltage Vout2 and outputs the control voltage Vout2 to the driving stage of the power amplifier connected to the power control circuit;
  • the current control circuit is configured to detect the input output power control signal Vramp converts the output power control signal Vramp into a control current Ibase and outputs the control current Ibase to the amplification stage of the power amplifier.
  • the collector of the power transistor M1 is connected to the collector of the power amplifier, and the control voltage is supplied to the power amplifier.
  • the current through the power transistor M1 is large.
  • the power transistor M2 only needs to be a power amplifier. A small bias current is provided. Therefore, the power control circuit in the embodiment of the present invention does not require a large-area power transistor, and the area of the power control circuit is reduced; in addition, the power of the power control circuit in the embodiment of the present invention is The driver's driver stage and amplifier stage control are separated and have greater design freedom.
  • control voltage Vout2 is output to each stage of the power amplifier including the power amplifier of at least one stage of driving; as shown in FIG. 2, the driving stage of the power amplifier is two stages, and the control voltage Vout2 is output to the power.
  • the collector of the two stages of the driver stage of the amplifier serves as the collector voltages Vcc1 and Vcc2, but is not limited thereto in practical applications, and the driving stage of the power amplifier may be one or more stages.
  • the voltage control circuit includes a first shaping circuit and a voltage regulator Ldo configured to convert the output power control signal Vramp into the control voltage Vout2.
  • the regulator Ldo is a low dropout regulator.
  • the first shaping circuit performs a starting point drift with respect to the output power control signal Vramp, that is, when the output power control signal Vramp is smaller than the set first voltage value VosX1, the voltage output value is shifted.
  • the set second voltage value VosY is such that the amplifier output power meets the PVT requirement.
  • the control voltage Vout2 output by the voltage control circuit is positively correlated with the input output power control signal Vramp voltage when the output power control signal Vramp is greater than the preset first threshold and less than the preset second threshold. relationship.
  • the output voltage Vout2 of the voltage control circuit shown in FIG. 4(a) is linear with the input voltage Vramp; the output voltage Vout2 of the voltage control circuit and the input voltage Vramp as shown in FIG.
  • the relationship is a piecewise linear relationship; the output voltage Vout2 of the voltage control circuit shown in Fig. 4(c) is squared with the input voltage Vramp; the output voltage Vout2 of the voltage control circuit shown in Fig. 4(d) is The input voltage Vramp is exponential.
  • the voltage control circuit further includes a clamping circuit configured to voltage clamp the output power control signal when the output power control signal exceeds a preset second threshold, the first shaping circuit and the clamping circuit pair output
  • the power control signal Vramp is processed to obtain a voltage Vin1, and the regulator Ldo converts the voltage Vin1 into a control voltage Vout2.
  • the clamp output circuit Vtop causes the voltage output value to no longer change with the output power control signal Vramp, ensuring the output voltage Vout2 of the linear regulator Ldo.
  • the output power control signal Vramp voltage is converted into the output voltage Vin1 by the first shaping circuit and the clamp circuit in a proportional relationship, and the voltage Vin1 is regulated by the voltage regulator Ldo to output the control voltage Vout2 as the operating voltage of the power amplifier driving stage;
  • the output power control signal Vramp voltage is increased from small, the control voltage Vout2 is increased, the power amplifier driver stage operating voltages Vcc1 and Vcc2 are increased, and the output power of the driving power amplifier is increased; when the output power control signal Vramp is decreased The power amplifier driver stage operating voltages Vcc1 and Vcc2 are reduced, and the output power of the driving power amplifier is reduced.
  • the current control circuit includes a voltage current converter configured to convert the output power control signal Vramp into a first output current Ivi, and an error amplifier and power configured to convert the first output current Ivi into a control current Ibase.
  • Transistor M2 is configured to convert the output power control signal Vramp into a first output current Ivi, and an error amplifier and power configured to convert the first output current Ivi into a control current Ibase.
  • the first control current Ivi output by the voltage current converter is positively correlated with the input output power control signal Vramp voltage.
  • the output current Ivi of the voltage-current converter is positively correlated with the input voltage Vramp when the output power control signal Vramp is greater than the set third voltage value VosX2.
  • the output current Ivi of the voltage-current converter shown in FIG. 5(a) is linear with the input voltage VRAMP; the output current Ivi of the voltage-current converter shown in FIG.
  • the current control circuit further includes a second shaping circuit configured to shape the output power control signal Vramp.
  • the second shaping circuit performs a starting point drift of the output current with respect to the output power control signal Vramp, that is, when the output power control signal Vramp is smaller than the set third voltage value VosX2, the current output value Ivi is shifted. For the set current value IosY, so that the amplifier output power meets the power time template PVT requirements.
  • the collector current Icc3 of the power amplifier amplifier stage is converted into a voltage signal input to the negative input V- of the error amplifier by the resistor Rsense, and the current Ivi positively correlated with the output power control signal Vramp is converted into the error amplifier by the resistor R1.
  • the positive input voltage V+ due to the virtual short characteristic of the error amplifier, the negative input changes as the positive input changes.
  • the output current Ivi of the voltage current converter becomes larger, the positive input voltage V+ of the error amplifier becomes smaller, the negative input voltage V- follows V+ becomes smaller, and the error amplifier output voltage Vout1 becomes smaller.
  • the output current Ibase of the power transistor M2 becomes larger, and at the same time, the voltage drop Vsense on the resistor Rsense becomes smaller, so that the collector current Icc3 of the power amplifier amplification stage becomes larger, the output power of the power amplifier increases; when the output power control signal Vramp decreases
  • the negative input voltage V- of the error amplifier is decreased, the error amplifier output voltage Vout1 becomes larger, the output current Ibase of the power transistor M2 becomes smaller, the collector current Icc3 of the power amplifier amplification stage becomes smaller, and the output power of the power amplifier decreases.
  • the power control circuit further includes a resistor Rsense connected to the power source at one end, and the other end of the resistor Rsense is simultaneously connected to the negative input terminal of the error amplifier and the collector of the power amplifier amplification stage.
  • the collector current Icc3 is large when the power amplifier has a large output power, and the Rsense is directly connected in series to the collector of the power amplifier amplifier stage, the amplifier efficiency is affected.
  • the value of the resistor Rsense is generally less than 100 milliohms.
  • the substrate can be routed, tied, or routed.
  • the magnitude of the power amplifier efficiency reduction caused by the resistor Rsense is smaller than the magnitude of the power amplifier efficiency reduction caused by the voltage control method in the related art.
  • the power control circuit uses a voltage control circuit and a current control circuit to convert an input power control signal into a control voltage Vout2 and a control current Ibase, and outputs the same to a driving stage and an amplification stage of the power amplifier, and controls the power amplifier to realize the same.
  • the RF amplification function improves the performance of the power amplifier circuit compared to the prior art.
  • an embodiment of the present invention provides a power amplifying circuit.
  • the power control circuit provided by the embodiment of the present invention includes a voltage control circuit and a current control circuit.
  • the voltage control circuit is configured to detect an input output power control signal Vramp and convert the output power control signal Vramp into a control.
  • the voltages Vout3 and Vout4, and the control voltages Vout3 and Vout4 are output to the driving stage of the power amplifier connected to the power control circuit;
  • the current control circuit is configured to detect the input output power control signal Vramp, and convert the output power control signal Vramp into a control
  • the current Ibase outputs the control current Ibase to the amplification stage of the power amplifier.
  • the control voltage is output to each of the driving stages of the power amplifier including at least one driving stage; as shown in FIG. 3, the driving stage of the power amplifier is two stages, and the control voltages Vout3 and Vout4 are respectively output. It is applied to the collectors of the two stages of the driver stage of the power amplifier as the collector voltages Vcc1 and Vcc2, but is not limited thereto in practical applications, and the driving stage of the power amplifier may be one or more stages.
  • the voltage control circuit includes a first shaping circuit and a voltage regulator configured to convert the output power control signal Vramp into control voltages Vout3 and Vout4.
  • the voltage regulator includes a voltage regulator Ldo1 and a voltage regulator Ldo2, the voltage regulator Ldo1 outputs a control voltage Vout3, the voltage regulator Ldo2 outputs a control voltage Vout4, and the voltage regulators Ldo1 and Ldo2 are low-dropout linear regulators.
  • control voltages Vout3 and Vout4 output by the voltage control circuit are different from the input output power control signal Vramp voltage when the output power control signal Vramp is greater than the preset first threshold and less than the preset second threshold. Positive relationship.
  • the voltage control circuit further includes a clamp circuit 1 and a clamp circuit 2 configured to voltage clamp the output power control signal when the output power control signal exceeds a preset second threshold, the first shaping circuit
  • the clamp circuit 1 processes the output power control signal Vramp to obtain the voltage Vin3
  • the regulator Ldo1 converts the voltage Vin3 into the control voltage Vout3
  • the first shaping circuit and the clamp circuit 2 process the output power control signal Vramp to obtain The voltage Vin4
  • the regulator Ldo2 converts the voltage Vin4 into the control voltage Vout4.
  • the clamp output circuit makes the voltage output value no longer change with the output power control signal Vramp, ensuring the output voltage of the linear regulator at the normal operating voltage of the power amplifier driver stage.
  • the functions of the clamp circuit 2 and the clamp circuit 3 in the embodiment of the present invention may also be implemented by the same clamp circuit.
  • the first shaping circuit and the clamp circuit process the output power signal Vramp to obtain an input stable. Voltages of voltage regulators Ldo1 and Ldo2.
  • the power control circuit uses a voltage control circuit and a current control circuit to convert an input power control signal into a control voltage and a control current Ibase, and outputs the same to a driving stage and an amplification stage of the power amplifier, and controls the power amplifier to realize the RF thereof.
  • the amplification function improves the performance of the power amplifying circuit compared to the prior art.
  • An embodiment of the present invention provides a power amplifying circuit including a power amplifier and a power control circuit.
  • the power control circuit is connected to the power amplifier and configured to input a control voltage and a control current Ibase to the power amplifier.
  • the power amplifier is configured to According to the control voltage and the control current Ibase, the input radio frequency signal is correspondingly amplified and output;
  • the power control circuit may adopt the composition and function of the power control circuit described in the above technical solution.
  • a power control circuit as shown in FIG. 2 may be adopted, specifically:
  • the voltage control circuit receives the input output power control signal Vramp, converts the output power control signal Vramp into a control voltage Vout2 by the first shaping circuit and the linear regulator, and inputs the control voltage Vout2 to the driving stage of the power amplifier;
  • the current control circuit receives The input output power control signal Vramp converts the output power control signal Vramp from the voltage current converter, the error amplifier and the power transistor to the control current Ibase, and then inputs the control current Ibase to the amplification stage of the power amplifier; the control voltage Vout2 and the control current Under the control of Ibase, the power amplifier proportionally amplifies the RF signal received by the RF input RF IN and outputs it from the RF output terminal RF OUT.
  • the power amplifying circuit uses a voltage control circuit and a current control circuit to convert an input power control signal into a control voltage and a control current Ibase, and outputs the power to the driving stage and the amplification stage of the power amplifier, and controls the power amplifier to realize the radio frequency thereof.
  • the amplification function improves the performance of the power amplifying circuit compared to the prior art.
  • the power control circuit and the power amplifying circuit provided by the embodiment of the invention convert the input power control signal into a control voltage and a control current by using a voltage control circuit and a current control circuit, and output to the driving stage and the amplification stage of the power amplifier, and control the power amplifier.
  • the collector current of the power transistor M1 is reduced and the performance of the power amplifier circuit is improved compared with the related art.

Abstract

本发明公开了一种功率控制电路，所述功率控制电路包括：电压控制电路和电流控制电路；其中，所述电压控制电路，配置为检测输入的输出功率控制信号，将所述输出功率控制信号转换为控制电压并向与所述功率控制电路连接的功率放大器的驱动级输出；所述电流控制电路，配置为检测输入的输出功率控制信号，将所述输出功率控制信号转换为控制电流并向所述功率放大器的放大级输出。本发明还公开了一种功率放大电路。

Description

一种功率控制电路及功率放大电路
相关申请的交叉引用
本申请基于申请号为201710139207.0、申请日为2017年03月09日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及电子技术领域，尤其涉及一种功率控制电路及功率放大电路。
背景技术
目前，射频功率放大器在通信领域有着极为广泛的应用，如全球第二代(The 2nd Generation，2G)移动通信技术全球移动通信系统(Global System for Mobile Communication，GSM)中的功率放大器，该功率放大器在饱和工作模式下，为了满足第三代合作伙伴计划(3rd Generation Partnership Project，3GPP)协议对GSM输出功率在时域上的功率时间模板(PVT)的要求，功率放大器输出功率受外部输出功率控制信号Vramp电压控制，将射频输入端口RF IN的输入的射频信号放大，并由射频输出端口RF OUT输出时，常用的实现方法是：用闭环电路控制功率放大器的集电极电压Vcc，使集电极电压Vcc与输出功率控制信号Vramp成正比关系，达到功率放大器的输出功率随输出功率控制信号Vramp变化的目的，这种方法被称为电压控制方法。
如图1所示的电压控制方法中，通过采样电路将功率晶体管M1的集电极输出电压值信息反馈到差分放大器OP正输入端，与输出功率控制信号 Vramp电压相比较取差值后驱动功率晶体管M1输出电压Vout作为功率放大器的集电极电压，功率放大器的集电极电压即功率放大器的驱动级的集电极电压Vcc1、Vcc2以及功率放大器的放大级的集电极电压Vcc3。当输出功率控制信号Vramp增大时，功率晶体管M的集电极输出Vout增大，功率放大器工作电压上升，输出功率增高；当输出功率控制信号Vramp减小时，功率晶体管M的集电极输出Vout下降，功率放大器的输出功率降低。
使用电压控制方法进行功率放大器的输出功率控制时，由于饱和GSM功率放大器输出功率比较高，工作电流大，需要采用大面积的功率晶体管M1才能满足电流要求；同时，功率晶体管M1产生的电压降直接影响功率放大器的效率。
发明内容
有鉴于此，本发明实施例提供一种功率控制电路及功率放大电路。
本发明实施例提供了一种功率控制电路，该功率控制电路包括电压控制电路和电流控制电路；其中，
所述电压控制电路，配置为检测输入的输出功率控制信号，将所述输出功率控制信号转换为控制电压，并将所述控制电压向与所述功率控制电路连接的功率放大器的驱动级输出；
所述电流控制电路，配置为检测输入的输出功率控制信号，将所述输出功率控制信号转换为控制电流，并向所述功率放大器的放大级输出。
上述方案中，所述控制电压输出到包括至少一级驱动级的所述功率放大器的每一级驱动级上。
上述方案中，所述电压控制电路包括第一整形电路和稳压器，所述第一整形电路和所述稳压器配置为将所述输出功率控制信号转换为控制电压。
上述方案中，所述电压控制电路输出的控制电压，在所述输出功率控 制信号大于预设的第一阈值且小于预设的第二阈值时，与输入的输出功率控制信号电压为正相关关系。
上述方案中，所述电压控制电路还包括钳位电路，配置为在所述输出功率控制信号超过预设的第二阈值时，对所述输出功率控制信号进行电压钳位。
上述方案中，所述电流控制电路包括电压电流转换器、误差放大器和功率晶体管；其中，
所述电压电流转换器，配置为将输入电压转换为第一输出电流；
所述误差放大器和所述功率晶体管，配置为将所述第一输出电流转换为控制电流。
上述方案中，所述电压电流转换器输出的第一控制电流，在所述输出功率控制信号大于预设的第三阈值时，与输入的输出功率控制信号电压为正相关关系。
上述方案中，所述电流控制电路还包括第二整形电路，配置为对所述输出功率控制信号进行整形。
上述方案中，所述功率控制电路还包括一端与电源连接的电阻，所述电阻的另一端同时连接误差放大器的负极输入端和功率放大器放大级的集电极。
本发明实施例提供了一种功率放大电路，所述功率放大电路包括功率放大器以及上述技术方案中的功率控制电路；其中，
所述功率控制电路，与所述功率放大器连接，配置为向所述功率放大器输入控制电压和控制电流；
所述功率放大器，配置为根据所述控制电压和控制电流将输入的射频信号进行相应放大处理后输出。
本发明实施例提供的功率控制电路及功率放大电路，采用电压控制电 路和电流控制电路将输入功率控制信号转换为控制电压和控制电流，并向功率放大器的驱动级和放大级输出，控制功率放大器实现其射频放大功能，相比较相关技术，减少了功率晶体管M1的集电极电流，改善了功率放大电路的性能。
附图说明
图1为相关技术中功率放大电路的电路结构示意图；
图2为本发明实施例一中功率放大电路的电路结构示意图；
图3为本发明实施例二中功率放大电路的电路结构示意图；
图4为本发明实施例中电压控制电路的输出电压-输入电压关系示意图；
图5为本发明实施例中电压电流转换器的输出电流-输入电压关系示意图。
具体实施方式
为了能够更加详尽地了解本发明的特点与技术内容，下面结合附图对本发明的实现进行详细阐述，所附附图仅供参考说明之用。
实施例一
图2为本发明实施例中功率放大电路的电路结构示意图，如图2所示，本发明实施例提供的功率控制电路包括电压控制电路和电流控制电路；其中，电压控制电路，配置为检测输入的输出功率控制信号Vramp，将输出功率控制信号Vramp转换为控制电压Vout2并将控制电压Vout2向与功率控制电路连接的功率放大器的驱动级输出；电流控制电路，配置为检测输入的输出功率控制信号Vramp，将输出功率控制信号Vramp转换为控制电流Ibase并将控制电流Ibase向功率放大器的放大级输出。
在相关技术中，功率晶体管M1的集电极连接功率放大器的集电极，为 功率放大器提供控制电压，通过功率晶体管M1的电流较大；而在本发明实施例中，功率晶体管M2仅需为功率放大器提供较小的偏置电流，因此，本发明实施例中的功率控制电路不需要大面积的功率晶体管，减小了功率控制电路的面积；此外，本发明实施例中的功率控制电路的将功率放大器的驱动级和放大级控制分开，具有较大的设计自由度。
在本发明实施例中，控制电压Vout2输出到包括至少一级驱动级的功率放大器的每一级驱动级上；如图2所示，功率放大器的驱动级为两级，控制电压Vout2输出到功率放大器的驱动级的两级的集电极上，作为集电极电压Vcc1和Vcc2，但在实际应用中并不局限于此，功率放大器的驱动级也可以为一级或者多级。
如图2所示，电压控制电路包括配置为将输出功率控制信号Vramp转换为控制电压Vout2的第一整形电路和稳压器Ldo。其中，稳压器Ldo是一种低压差线性稳压器(low dropout regulator)。如图4所示，第一整形电路将电压输出值相对于输出功率控制信号Vramp进行起始点漂移，即在输出功率控制信号Vramp小于设定的第一电压值VosX1时，使电压输出值偏移为设定的第二电压值VosY，以使放大器输出功率满足PVT要求。
在本发明实施例中，电压控制电路输出的控制电压Vout2在输出功率控制信号Vramp大于预设的第一阈值且小于预设的第二阈值时，与输入的输出功率控制信号Vramp电压为正相关关系。如图4所示，在输出功率控制信号Vramp大于设定的第一电压值VosX1即第一阈值且小于第二阈值Vclamp时，电压控制电路的输出电压Vout2与输入电压Vramp之间为正相关关系；其中，如图4(a)所示的电压控制电路的输出电压Vout2与输入电压Vramp之间为线性关系；如图4(b)所示的电压控制电路的输出电压Vout2与输入电压Vramp之间为分段线性关系；如图4(c)所示的电压控制电路的输出电压Vout2与输入电压Vramp之间为平方关系；如图4(d) 所示的电压控制电路的输出电压Vout2与输入电压Vramp之间为指数关系。
如图2所示，电压控制电路还包括配置为在输出功率控制信号超过预设的第二阈值时对输出功率控制信号进行电压钳位的钳位电路，第一整形电路和钳位电路对输出功率控制信号Vramp进行处理，得到电压Vin1，稳压器Ldo将电压Vin1转换为控制电压Vout2。如图4所示，钳位电路在输出功率控制信号Vramp超过第二阈值Vclamp时，固定输出电压Vtop使电压输出值不再随输出功率控制信号Vramp变化，确保线性稳压器Ldo的输出电压Vout2在功率放大器驱动级的正常工作电压范围内。
功率放大器工作时，输出功率控制信号Vramp电压被第一整形电路和钳位电路按比例关系转换输出电压Vin1，电压Vin1经过稳压器Ldo稳压输出控制电压Vout2作为功率放大器驱动级的工作电压；当输出功率控制信号Vramp电压由小增大时，控制电压Vout2增大，功率放大器驱动级工作电压Vcc1和Vcc2随之增大，驱动功率放大器的输出功率增大；当输出功率控制信号Vramp减小时，功率放大器驱动级工作电压Vcc1和Vcc2减小，驱动功率放大器的输出功率随之减小。
如图2所示，电流控制电路包括配置为将输出功率控制信号Vramp转换为第一输出电流Ivi的电压电流转换器，以及配置为将第一输出电流Ivi转换为控制电流Ibase的误差放大器以及功率晶体管M2。
其中，在输出功率控制信号Vramp大于预设的第三阈值时，电压电流转换器输出的第一控制电流Ivi与输入的输出功率控制信号Vramp电压为正相关关系。如图5所示，电压电流转换器的输出电流Ivi在输出功率控制信号Vramp大于设定的第三电压值VosX2时，与输入电压Vramp之间为正相关关系。其中，如图5(a)所示的电压电流转换器的输出电流Ivi与输入电压VRAMP之间为线性关系；如图5(b)所示的电压电流转换器的输出电流Ivi与输入电压Vramp之间为分段线性关系；如图5(c)所示的电压电 流转换器的输出电流Ivi与输入电压Vramp之间为平方关系；如图5(d)所示的电压电流转换器的输出电流Ivi与输入电压Vramp之间为指数关系。
如图2所示，电流控制电路还包括配置为对输出功率控制信号Vramp进行整形的第二整形电路。如图5所示，第二整形电路将输出电流相对于输出功率控制信号Vramp进行起始点漂移，即在输出功率控制信号Vramp小于设定的第三电压值VosX2时，使电流输出值Ivi偏移为设定的电流值IosY，以使放大器输出功率满足功率时间模板PVT要求。
功率放大器工作时，功率放大器放大级的集电极电流Icc3被电阻Rsense转化为电压信号输入到误差放大器的负极输入V-，与输出功率控制信号Vramp正相关关系的电流Ivi被电阻R1转化为误差放大器的正极输入电压V+，由于误差放大器的虚短特性，负极输入跟随正极输入变化而变化。
当输出功率控制信号Vramp电压增大时，电压电流转换器的输出电流Ivi变大，误差放大器的正极输入电压V+变小，负极输入电压V-跟随V+变小，误差放大器输出电压Vout1变小，功率晶体管M2的输出电流Ibase变大，同时，电阻Rsense上压降Vsense变小，使功率放大器放大级的集电极电流Icc3变大，功率放大器的输出功率增大；当输出功率控制信号Vramp减小时，误差放大器的负极输入电压V-减小，误差放大器输出电压Vout1变大，功率晶体管M2的输出电流Ibase变小，功率放大器放大级的集电极电流Icc3变小，功率放大器的输出功率减小。
如图2所示，在发明实施例中，功率控制电路还包括一端与电源连接的电阻Rsense，电阻Rsense的另一端同时连接误差放大器的负极输入端和功率放大器放大级的集电极。
由于功率放大器在输出功率较大时集电极电流Icc3较大，而Rsense是直接串接在功率放大器放大级的集电极上，会影响放大器效率。为了降低在Rsense上的消耗的能量，电阻Rsense取值一般为100毫欧姆以下，其实 现方式可以是基板走线，绑线，芯片走线等方式。电阻Rsense引起的功率放大器效率降低的量级比相关技术中电压控制方法引起的功率放大器效率降低的量级要小。
本发明实施例提供的功率控制电路，采用电压控制电路和电流控制电路将输入功率控制信号转换为控制电压Vout2和控制电流Ibase，并向功率放大器的驱动级和放大级输出，控制功率放大器实现其射频放大功能，相比较现有技术，改善了功率放大电路的性能。
实施例二
在实施例一的基础上，本发明实施例提供了一种功率放大电路。如图3所示，本发明实施例提供的功率控制电路包括电压控制电路和电流控制电路；其中，电压控制电路，配置为检测输入的输出功率控制信号Vramp，将输出功率控制信号Vramp转换为控制电压Vout3和Vout4，并将控制电压Vout3和Vout4向与功率控制电路连接的功率放大器的驱动级输出；电流控制电路，配置为检测输入的输出功率控制信号Vramp，将输出功率控制信号Vramp转换为控制电流Ibase并将控制电流Ibase向功率放大器的放大级输出。
在本发明实施例中，控制电压输出到包括至少一级驱动级的功率放大器的每一级驱动级上；如图3所示，功率放大器的驱动级为两级，控制电压Vout3和Vout4分别输出到功率放大器的驱动级的两级的集电极上，作为集电极电压Vcc1和Vcc2，但在实际应用中并不局限于此，功率放大器的驱动级也可以为一级或者多级。
如图3所示，电压控制电路包括配置为将输出功率控制信号Vramp转换为控制电压Vout3和Vout4的第一整形电路和稳压器。其中，稳压器包括稳压器Ldo1和稳压器Ldo2，稳压器Ldo1输出控制电压Vout3，稳压器Ldo2输出控制电压Vout4，稳压器Ldo1和Ldo2均为低压差线性稳压器。
在本发明实施例中，电压控制电路输出的控制电压Vout3和Vout4在输出功率控制信号Vramp大于预设的第一阈值且小于预设的第二阈值时，与输入的输出功率控制信号Vramp电压为正相关关系。
如图3所示，电压控制电路还包括配置为在输出功率控制信号超过预设的第二阈值时对输出功率控制信号进行电压钳位的钳位电路1和钳位电路2，第一整形电路和钳位电路1对输出功率控制信号Vramp进行处理，得到电压Vin3，稳压器Ldo1将电压Vin3转换为控制电压Vout3；第一整形电路和钳位电路2对输出功率控制信号Vramp进行处理，得到电压Vin4，稳压器Ldo2将电压Vin4转换为控制电压Vout4。
钳位电路在输出功率控制信号Vramp超过设定的阈值时，固定输出电压使电压输出值不再随输出功率控制信号Vramp变化，确保线性稳压器的输出电压在功率放大器驱动级的正常工作电压范围内。
本发明实施例中的钳位电路2和钳位电路3的功能也可以由同一个钳位电路来实现，此时，第一整形电路和钳位电路对输出功率信号Vramp进行处理后得到输入稳压器Ldo1和Ldo2的电压。
功率放大器工作时，当输出功率控制信号Vramp电压由小增大时，控制电压Vout3和Vout4增大，功率放大器驱动级工作电压Vcc1和Vcc2随之增大，驱动功率放大器的输出功率增大；当输出功率控制信号Vramp减小时，功率放大器驱动级工作电压Vcc1和Vcc2减小，驱动功率放大器的输出功率随之减小。
本发明实施例提供的功率控制电路，采用电压控制电路和电流控制电路将输入功率控制信号转换为控制电压和控制电流Ibase，并向功率放大器的驱动级和放大级输出，控制功率放大器实现其射频放大功能，相比较现有技术，改善了功率放大电路的性能。
实施例三
本发明实施例提供一种功率放大电路，该功率放大电路包括功率放大器以及功率控制电路；其中，功率控制电路与功率放大器连接，配置为向功率放大器输入控制电压和控制电流Ibase；功率放大器配置为根据控制电压和控制电流Ibase将输入的射频信号进行相应放大处理后输出；
这里，所述功率控制电路可采用上述技术方案中描述的功率控制电路的组成及功能，比如：可采用如图2所示的功率控制电路，具体地：
电压控制电路接收输入的输出功率控制信号Vramp，将输出功率控制信号Vramp由第一整形电路和线性稳压器转换为控制电压Vout2后，将控制电压Vout2输入功率放大器的驱动级；电流控制电路接收输入的输出功率控制信号Vramp，将输出功率控制信号Vramp由电压电流转换器、误差放大器和功率晶体管转换为控制电流Ibase后，将控制电流Ibase输入功率放大器的放大级；在控制电压Vout2和控制电流Ibase的控制下，功率放大器将射频输入端RF IN接收的射频信号按比例放大后由射频输出端RF OUT输出。
本发明实施例提供的功率放大电路，采用电压控制电路和电流控制电路将输入功率控制信号转换为控制电压和控制电流Ibase，并向功率放大器的驱动级和放大级输出，控制功率放大器实现其射频放大功能，相比较现有技术，改善了功率放大电路的性能。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。
工业实用性
本发明实施例提供的功率控制电路及功率放大电路，采用电压控制电路和电流控制电路将输入功率控制信号转换为控制电压和控制电流，并向功率放大器的驱动级和放大级输出，控制功率放大器实现其射频放大功能，相比较相关技术，减少了功率晶体管M1的集电极电流，改善了功率放大电 路的性能。

Claims (10)

  1. 一种功率控制电路，所述功率控制电路包括电压控制电路和电流控制电路；其中，
    所述电压控制电路，配置为检测输入的输出功率控制信号，将所述输出功率控制信号转换为控制电压，并将所述控制电压向与所述功率控制电路连接的功率放大器的驱动级输出；
    所述电流控制电路，配置为检测输入的输出功率控制信号，将所述输出功率控制信号转换为控制电流，并向所述功率放大器的放大级输出。
  2. 根据权利要求1所述的功率控制电路，其中，所述控制电压输出到包括至少一级驱动级的所述功率放大器的每一级驱动级上。
  3. 根据权利要求1或2所述的功率控制电路，其中，所述电压控制电路包括第一整形电路和稳压器，所述第一整形电路和所述稳压器配置为将所述输出功率控制信号转换为控制电压。
  4. 根据权利要求3所述的功率控制电路，其中，所述电压控制电路输出的控制电压，在所述输出功率控制信号大于预设的第一阈值且小于预设的第二阈值时，与输入的输出功率控制信号电压为正相关关系。
  5. 根据权利要求4所述的功率控制电路，其中，所述电压控制电路还包括钳位电路，配置为在所述输出功率控制信号超过预设的第二阈值时，对所述输出功率控制信号进行电压钳位。
  6. 根据权利要求1或2所述的功率控制电路，其中，所述电流控制电路包括电压电流转换器、误差放大器和功率晶体管；其中，
    所述电压电流转换器，配置为将输入电压转换为第一输出电流；
    所述误差放大器和所述功率晶体管，配置为将所述第一输出电流转换为控制电流。
  7. 根据权利要求6所述的功率控制电路，其中，所述电压电流转换器 输出的第一控制电流，在所述输出功率控制信号大于预设的第三阈值时，与输入的输出功率控制信号电压为正相关关系。
  8. 根据权利要求6所述的功率控制电路，其中，所述电流控制电路还包括第二整形电路，配置为对所述输出功率控制信号进行整形。
  9. 根据权利要求6所述的功率控制电路，其中，所述功率控制电路还包括一端与电源连接的电阻，所述电阻的另一端同时连接误差放大器的负极输入端和功率放大器放大级的集电极。
  10. 一种功率放大电路，所述功率放大电路包括功率放大器以及权利要求1至9任一项所述的功率控制电路；其中，
    所述功率控制电路，与所述功率放大器连接，配置为向所述功率放大器输入控制电压和控制电流；
    所述功率放大器，配置为根据所述控制电压和控制电流将输入的射频信号进行相应放大处理后输出。
PCT/CN2017/117145 2017-03-09 2017-12-19 一种功率控制电路及功率放大电路 WO2018161678A1 (zh)

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