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Apparatus with distortion cancelling feed forward signal

  • US 5,507,036 A
  • Filed: 09/30/1994
  • Issued: 04/09/1996
  • Est. Priority Date: 09/30/1994
  • Status: Expired due to Fees
First Claim
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1. An apparatus for common-mode extraction of even mode non-linear distortion in a direct conversion receiver, comprising:

  • a mixer that combines an RF input signal with an output signal of a local oscillator;

    a balanced low-pass filter coupled to an output signal of the mixer;

    an even mode distortion extractor coupled to an output signal of the balanced low-pass filter;

    an amplifier coupled to an output signal of the extractor;

    a phase shifter coupled to the amplifier; and

    a subtractor coupled to the balanced low-pass filter and the phase shifter;

    wherein the distortion generated by the mixer is extracted by the even mode extractor and applied to the desired signal of the subtractor thereby suppressing distortion.

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