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    • 13. 发明申请
    • AGC Circuit
    • AGC电路
    • US20060293009A1
    • 2006-12-28
    • US11425910
    • 2006-06-22
    • Kazuyuki Kobayashi
    • Kazuyuki Kobayashi
    • H04B1/06H04B7/00
    • H03G3/3036
    • An AGC circuit comprises a variable gain amplifier that has a gain set variably and amplifies an input signal with the gain; a detection circuit that detects an output signal amplified by the variable gain amplifier; an error amplifier that outputs an error voltage corresponding to a difference voltage between a detected voltage indicating amplitude of the detected output signal and a reference voltage for fixing the amplitude of the output signal to be at a predetermined degree; a capacitor that is charged depending on the error voltage and holds a setting voltage for fixing the gain of the variable gain amplifier to be constant that is applied to a gain setting input of the variable gain amplifier; and a charging switch circuit that is closed to permit charging the capacitor until the charged voltage of the capacitor reaches the setting voltage and is opened to forbid charging the capacitor after the charged voltage reaches the setting voltage.
    • AGC电路包括可变增益放大器,该可变增益放大器可变地设置增益并且利用增益放大输入信号; 检测电路,检测由可变增益放大器放大的输出信号; 误差放大器,输出对应于表示检测出的输出信号的振幅的检测电压与将输出信号的振幅固定为规定程度的基准电压之间的差分电压的误差电压; 电容器,其根据误差电压进行充电,并将用于固定可变增益放大器的增益的设定电压保持为恒定,该电压被施加到可变增益放大器的增益设定输入; 以及关闭充电开关电路,以允许电容器充电直到电容器的充电电压达到设定电压,并且在充电电压达到设定电压后打开以禁止对电容器充电。