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Linear power amplification method and linear power amplifier

  • US 20040116083A1
  • Filed: 12/09/2003
  • Published: 06/17/2004
  • Est. Priority Date: 12/10/2002
  • Status: Active Grant
First Claim
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1. A linear power amplifier comprising:

  • a digital predistorter supplied with a digital transmission signal, for predistorting said digital transmission signal by use of a power series model to generate a predistorted signal;

    a DA converter for converting said predistorted signal from said digital predistorter into an analog predistorted signal;

    a frequency upconverting part for upconverting said analog predistorted signal to a transmit frequency band;

    a power amplifier for power-amplifying said upconverted signal;

    a frequency downconverting part for downconverting a portion of the output from said power amplifier to output a downconverted signal; and

    a digital predistorter control part for extracting distortion components of the same odd orders as those of said power series model and for controlling coefficients of said predistorter in a manner to lower the levels of said odd-order distortion components.

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