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Predistorter

  • US 20050258898A1
  • Filed: 03/08/2005
  • Published: 11/24/2005
  • Est. Priority Date: 05/19/2004
  • Status: Active Grant
First Claim
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1. A predistorter for compensating for a distortion generated at an amplifier by inputting a signal to be inputted to the amplifier constituting an object of compensating for the distortion and previously providing the distortion to the input signal, said predistorter comprising:

  • amplifier replica means having an input/output characteristic the same as an input/output characteristic of the amplifier or an input/output characteristic approximated thereto for inputting a signal to output;

    difference detecting means for detecting a difference between an input signal to the predistorter and an output signal from the amplifier replica means;

    amplifier replica input signal changing means for changing the signal inputted to the amplifier replica such that a difference detected by the difference detecting means is reduced; and

    change signal outputting means for outputting the signal changed by the amplifier replica input signal changing means to the amplifier.

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