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Circuit for measuring the output power from an amplifier

  • US 5,434,537 A
  • Filed: 02/08/1994
  • Issued: 07/18/1995
  • Est. Priority Date: 02/12/1993
  • Status: Expired due to Term
First Claim
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1. A circuit for monitoring power output from an amplifier, comprising:

  • a controllable varactor diode for sampling the power output from the amplifier;

    detecting circuit means coupled to an output of the varactor diode for generating a DC voltage corresponding to the magnitude of a sample from the varactor diode; and

    circuit means connected between said varactor diode and said detecting circuit means for coupling at least a portion of the DC voltage to a control electrode of the varactor diode to vary a reverse bias voltage thereacross in accord with a magnitude of said portion of the DC voltage, for controlling a level of sampling of said power output from the amplifier so that at high levels of power output, lesser values of said power output are coupled to said detecting circuit means.

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