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Accurate power sensing circuit for power amplifiers

  • US 6,822,515 B2
  • Filed: 03/09/2003
  • Issued: 11/23/2004
  • Est. Priority Date: 07/19/2002
  • Status: Active Grant
First Claim
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1. An amplifier circuit for amplifying radio frequency signals having temperature compensation and bias compensation, comprising:

  • a) a radio frequency power amplifier to receive an input radio frequency signal and to output an amplified radio frequency signal;

    b) a first transistor to perform as a detector diode, including i) a first base to receive the amplified radio frequency signal, a second DC bias input signal from a regulated DC source, and a third power-sensing signal; and

    ii) a first collector connected to the first base; and

    c) a second transistor to amplify the DC component of the RF signal from the first base, including i) a second base coupled to the first base; and

    ii) a second collector to output the power-sensing signal, said power-sensing signal being coupled to the regulated DC source through a resistor.

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