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    • 26. 发明授权
    • Method and apparatus for controlling gain of a power amplifier
    • 用于控制功率放大器增益的方法和装置
    • US5892396A
    • 1999-04-06
    • US903891
    • 1997-07-31
    • Mark B. AndersonBrian D. Wiseman
    • Mark B. AndersonBrian D. Wiseman
    • H03G3/30H03G3/20
    • H03G3/3042
    • A method and apparatus for controlling the gain of a power amplifier wherein the method includes the steps of attenuating, detecting, and comparing. An attenuator (108) attenuates an amplified version of a radio frequency signal to an attenuated level. A single detector (109) alternatively detects the radio frequency signal power level at a power amplifier (101) input and the attenuated version of the amplified radio frequency signal. The detector (109) produces a first and a second signal each having a DC level representing the detected power levels. An operation amplifier configured for closed loop operation compares the DC levels of the first and second signals to produce a control signal (102) for controlling power amplifier (101) gain. Filters (119) and (120) filter the first and second signals before the comparing step.
    • 一种用于控制功率放大器的增益的方法和装置,其中该方法包括衰减,检测和比较的步骤。 衰减器(108)将射频信号的放大版本衰减到衰减级。 单个检测器(109)可选地检测功率放大器(101)输入端的射频信号功率电平和放大射频信号的衰减版本。 检测器(109)产生每个具有表示检测到的功率电平的DC电平的第一和第二信号。 配置为闭环操作的运算放大器将第一和第二信号的DC电平进行比较,以产生用于控制功率放大器(101)增益的控制信号(102)。 过滤器(119)和(120)在比较步骤之前过滤第一和第二信号。