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Power detector utilizing bias voltage divider for precision control of an amplifier

  • US 5,043,672 A
  • Filed: 03/26/1990
  • Issued: 08/27/1991
  • Est. Priority Date: 03/26/1990
  • Status: Expired due to Term
First Claim
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1. A controlled-output radio-frequency (RF) amplifier circuit wherein the output power level can be maintained at a number of predetermined levels over a range of operating temperatures, the amplifier circuit receiving an input RF signal and providing an output RF signal, the amplifier circuit comprising:

  • A. an RF amplifier stage having an input connected to receive the input RF signal, an output connected to provide the output RF signal, and a gain control input;

    B. a power level detector responsive to the output RF signal, and connected to provide a gain control signal to the gain control input of the amplifier stage, the power level detector further comprising;

    i. a detector diode, having an anode connected to be responsive to the output RF signal, and a cathode connected to provide the gain control signal;

    ii. means for providing a bias voltage and a ground reference voltage; and

    iii. voltage divider means, connected to the detector diode, the voltage divider means comprising;

    a. a first resistor, connected between the bias voltage and the anode of the diode; and

    b. a second resistor, connected between the cathode of the diode and the ground reference voltage, with the second resistor having a resistance much less than the first resistor.

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