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Electric power detecting circuit and gain control circuit using the same

  • US 4,531,089 A
  • Filed: 02/11/1982
  • Issued: 07/23/1985
  • Est. Priority Date: 02/20/1981
  • Status: Expired due to Term
First Claim
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1. A gain control circuit comprising:

  • a variable gain amplifier,a measuring circuit for detecting output electric power of said variable gain amplifier,a gain setting circuit coupled to the variable gain amplifier for generating a gain control signal controlling the gain of the variable gain amplifier, anda calculating circuit coupled to the output of the measuring circuit and to the output of the gain setting circuit for detecting input electric power of said variable gain amplifier on the basis of said gain control signal and the output signal of said measuring circuit,said gain setting circuit being controlled by an output of said calculating circuit to adjust said gain control signal in order to settle the output electric power of said variable gain amplifier to a predetermined value on the basis of the output signal of said calculating circuit and said predetermined value.

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