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Automatic electrical power control circuit

  • US 4,803,440 A
  • Filed: 09/16/1987
  • Issued: 02/07/1989
  • Est. Priority Date: 09/25/1986
  • Status: Expired due to Term
First Claim
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1. An automatic power control circuit comprising:

  • variable attenuator means disposed ahead of a power amplifier for variably setting the amount of attenuation of an input signal for the power amplifier;

    power detection means for detecting a portion of the output from the power amplifier and for generating a power output signal corresponding to the power output level of the power amplifier;

    comparison means for comparing the magnitude of the power output signal against a predetermined threshold value and for generating a decision signal based on said comparison indicating the presence or absence of power output from the power amplifier;

    error detection means for detecting the difference between control data from an external power output control signal and the power output signal from the detection means and generating an error signal corresponding to said difference;

    attenuator control means for integrating the error signal and generating an integrated correction value when the decision signal indicates the presence of power output from the power amplifier, and for generating the most recent prior integrated correction value when the decision signal indicates the absence of power output from the power amplifier; and

    means for transmitting said integrated correction value as a control signal to the variable attenuator.

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