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Linearization using parallel cancellation in linear power amplifier

  • US 6,242,979 B1
  • Filed: 02/23/2000
  • Issued: 06/05/2001
  • Est. Priority Date: 02/23/2000
  • Status: Active Grant
First Claim
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1. A linear power amplifier for amplifying an input carrier signal comprising:

  • a signal splitter operatively coupled to split the input carrier signal into at least a first split carrier signal and a second split carrier signal;

    a delay stage having the first split carrier signal as an input and outputting a delayed first split carrier signal;

    a first amplifier in a first path, having the delayed first split carrier signal as an input;

    a signal predistortor in a second path, operatively coupled to receive the second split carrier signal and to output a predistorted carrier signal, wherein the signal predistortor generates a distorted carrier signal with intermodulation signals 180 degrees out of phase with the intermodulation distortion in the output signal from a main power amplifier;

    a second amplifier in the second path and operatively responsive to the predistorted carrier signal; and

    a signal combiner, operatively coupled to an output from the first amplifier and to an output of The second amplifier.

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