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Distortion compensating circuit

  • US 5,404,378 A
  • Filed: 04/04/1994
  • Issued: 04/04/1995
  • Est. Priority Date: 04/20/1993
  • Status: Expired due to Fees
First Claim
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1. A distortion compensating circuit for compensating a nonlinear distortion generated in an amplifier for amplifying a signal modulated by a base band signal, comprising:

  • distortion correcting means that is intermittently operated, including a memory storage for storing distortion compensating data for compensating the nonlinear distortion in the output of said amplifier, and a subtracter for subtracting said distortion compensating data in said memory storage from said base band signal to output a corrected base band signal;

    a modulator for modulating a carrier signal by said corrected base band signal outputted from said distortion correcting means to output a modulated signal to said amplifier;

    a demodulator for demodulating a part of the signal outputted from said modulator;

    comparing means for comparing the demodulated signal outputted from said demodulator with said base band signal to output said distortion compensating data to said memory storage; and

    initial value setting means for setting an initial value of said distortion compensating data in said memory storage, said initial value being sufficient to compensate the nonlinear distortion.

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