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Predistortion amplifier

  • US 20030108120A1
  • Filed: 12/02/2002
  • Published: 06/12/2003
  • Est. Priority Date: 12/05/2001
  • Status: Active Grant
First Claim
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1. A predistortion amplifier comprising:

  • a 2-variable polynomial calculating unit for calculating a polynomial using real and imaginary parts of a baseband complex input signal as its two variables and having a complex coefficient;

    an orthogonal modulator for performing orthogonal modulation using two carriers perpendicular to the real and imaginary parts of an output signal of the polynomial calculating unit;

    a distributor for distributing the output of the orthogonal modulator to a power amplifier for power amplification and to part of an output of the power amplifier;

    an orthogonal demodulator for performing orthogonal demodulation over an output signal of the distributor and generating a baseband complex demodulation signal; and

    a coefficient updating section for sequentially updating a complex coefficient of the polynomial calculating unit on the basis of said baseband complex input signal and said baseband complex demodulation signal.

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