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Transmitter with improved power efficiency

  • US 20080119214A1
  • Filed: 11/16/2006
  • Published: 05/22/2008
  • Est. Priority Date: 11/16/2006
  • Status: Active Grant
First Claim
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1. A power amplifier (PA) line-up comprising:

  • a driver having a driver output;

    a PA having a PA input and a PA output;

    a first matching circuit having a first matching circuit output coupled to the PA input and having a first matching circuit input, the first matching circuit configured to receive a signal from the driver output and impedance match the signal to the PA input and the driver output;

    a second matching circuit having a second matching circuit input coupled to the PA output, a third matching circuit input, and a second matching circuit output configured to be coupled to a filter input, the second matching circuit configured to impedance match the signal to the filter input and at least one of the PA output and the driver output;

    a first transmission line coupled the third matching circuit input; and

    a first switch having a first switch output configured to selectively couple the driver to one of the first matching circuit and the second matching circuit via the first transmission line based upon a pre-determined output power level for the signal.

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