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High linearity doherty communication amplifier with phase control

  • US 20050012547A1
  • Filed: 12/15/2003
  • Published: 01/20/2005
  • Est. Priority Date: 02/01/2002
  • Status: Active Grant
First Claim
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1. A system for operating a power amplifier in a mobile handset, comprising:

  • a carrier amplifier having a carrier input terminal and a carrier output terminal;

    a peak amplifier having a peak input terminal, a peak output terminal and a control terminal for receiving a voltage control signal, the peak amplifier configured to vary at least one characteristic of the power amplifier based upon the voltage control signal;

    an active phase shifter, coupled to the carrier input terminal and the peak input terminal, for generating a peak amplifier input signal delayed in phase from a carrier amplifier input signal; and

    an output matching unit, coupled to the carrier output terminal and the peak output terminal, for transmitting a carrier output power signal and a peak output power signal and forming a power amplifier output power signal at a power amplifier output stage.

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