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Radio transceiver including transmitter power control circuit

  • US 5,832,374 A
  • Filed: 11/01/1996
  • Issued: 11/03/1998
  • Est. Priority Date: 11/19/1993
  • Status: Expired due to Term
First Claim
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1. A radio transceiver, comprising:

  • a gain controlled high-frequency driver amplifier stage having a signal output and having a control input for controlling the gain of the driver amplifier stage;

    a high-frequency power amplifier output stage having substantially constant gain, an input coupled to the signal output of the driver amplifier stage, and an output coupled to an antenna by coupling means which does not include any means for extracting, for the purpose of feedback control, a portion of power flowing in the coupling means;

    a high-frequency rectifier stage connected to the signal output of the driver amplifier stage for producing a control signal representing the amplitude of an HF signal outputted by the driver amplifier stage;

    a reference voltage source for producing a reference voltage representing a desired output power of the output stage; and

    a differential control amplifier stage responsive to the control signal produced by the rectifier stage and the reference voltage produced by the reference voltage source for producing a difference control voltage, the difference control voltage being supplied to the control input of the driver amplifier stage;

    wherein a constant relationship is maintained between at least one characteristic of the rectifier stage and one characteristic of the output stage;

    whereby the gain of the driver amplifier stage is controlled by the difference control voltage, thereby controlling the output power of the output stage.

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