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Digital predistortion apparatus and method in power amplifier

  • US 20050253652A1
  • Filed: 05/11/2005
  • Published: 11/17/2005
  • Est. Priority Date: 05/11/2004
  • Status: Active Grant
First Claim
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1. A digital predistortion apparatus for compensating by predistorting a nonlinear characteristic caused by a power amplifier that amplifies a input signal, the apparatus comprising:

  • a predistorter, electrically connected to the power amplifier via a digital-to-analog converter (DAC), for receiving the input signal and compensating for the nonlinear characteristic using a look-up table that depends upon a change in output power of the power amplifier; and

    a look-up table (LUT) updating block, electrically connected to the predistorter, for comparing a feed-back signal from the power amplifier with a output signal from the predistorter, and adaptively updating the look-up table using the compared result.

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