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Power amplifier (PA) with improved power regulation

  • US 20020183021A1
  • Filed: 06/05/2001
  • Published: 12/05/2002
  • Est. Priority Date: 06/05/2001
  • Status: Active Grant
First Claim
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1. A circuit for amplifying an input signal, comprising:

  • a power amplifier that receives the input signal and produces an output signal;

    an amplitude detector coupled to an output of the power amplifier that produces a first measurement that corresponds to the amplitude of the output signal;

    a power source for providing power to the power amplifier;

    a current detector that produces a second measurement that corresponds to the current flowing into the power amplifier from the power source;

    an adder for adding the first measurement with the second measurement to produce a third measurement; and

    a control circuit connected to a biasing pin of the power amplifier for comparing the third measurement to a reference and for controlling the output power of the power amplifier based on the comparison.

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