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Doherty amplifier using adaptive bias control

  • US 20040174212A1
  • Filed: 12/02/2003
  • Published: 09/09/2004
  • Est. Priority Date: 03/08/2003
  • Status: Abandoned Application
First Claim
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1. A Doherty amplifier comprising:

  • a coupler for splitting an input signal;

    an envelope detector for detecting an envelop voltage from one part of the input signal;

    a plurality of envelope shaping circuits for transforming the envelope voltage of the input signal; and

    a plurality of amplifiers for amplifying the other part of the input signal under control of the transformed envelope voltage provided from the envelope shaping circuits.

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