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Power control for a transmitter

  • US 20040266368A1
  • Filed: 06/25/2003
  • Published: 12/30/2004
  • Est. Priority Date: 06/25/2003
  • Status: Active Grant
First Claim
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1. A transmitter comprising:

  • a modulator providing a phase-modulated constant-envelope radio-frequency signal;

    a dividing unit dividing a signal provided by said modulator into a first signal and a second signal which are identical to each other;

    a first processing branch for processing a respective first signal provided by said dividing unit, said first processing branch comprising a first phase shifter and a first power amplifier connected to each other in series;

    a second processing branch for processing a respective second signal provided by said dividing unit, said second processing branch comprising a second phase shifter and a second power amplifier connected to each other in series;

    a combining unit combining signals provided by said first and said second processing branch;

    a first control arrangement for controlling the power of a signal output by said combining unit at least for higher power levels by controlling the amplifications applied by said first power amplifier and by said second power amplifier to a respectively received signal; and

    a second control arrangement for controlling the power of a signal output by said combining unit at least for lower power levels by controlling the phase shifts applied by said first phase shifter and by said second phase shifter to a respectively received signal.

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