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Method and apparatus for reduction of distortion in a feed forward amplifier

  • US 6,700,441 B1
  • Filed: 09/17/2002
  • Issued: 03/02/2004
  • Est. Priority Date: 09/17/2002
  • Status: Active Grant
First Claim
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1. A method for reducing distortion in a feed forward amplifier comprising steps of:

  • modulating an input signal of the feed forward amplifier with a reference modulation based on a reference signal to produce a reference signal modulated input signal;

    amplifying the reference signal modulated input signal to produce an amplified signal;

    determining an error signal based on the input signal and the amplified signal;

    amplifying the error signal to produce an amplified error signal;

    determining a corrected output signal based on the amplified signal and the amplified error signal;

    detecting a residual modulation in the corrected output signal, wherein the detected residual modulation corresponds to the reference modulation applied to the input signal;

    correlating the detected residual modulation and the reference signal to determine a correlation;

    generating at least one control signal based on the correlation, wherein the at least one control signal is capable of controlling error signal adjustments;

    holding the control signal constant;

    decoupling the reference modulation from the input signal; and

    optimizing carrier cancellation with the reference modulation decoupled.

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