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Compensation for modulation distortion

  • US 20070057737A1
  • Filed: 09/14/2005
  • Published: 03/15/2007
  • Est. Priority Date: 09/14/2005
  • Status: Abandoned Application
First Claim
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1. A phase locked loop with modulation distortion compensation system comprising:

  • a phase detector, a loop filter including a tuning voltage output, a voltage controlled oscillator (VCO) configured to provide a modulated radio frequency signal, and a feedback divider with a modulation input all intercoupled as a phase locked loop;

    a compensation function coupled to the tuning voltage output and configured to select a filter response from a plurality of filter responses, the filter response selected in accordance with a tuning voltage signal at the tuning voltage output; and

    a filter configured to distort a modulation signal in accordance with the filter response and provide a distorted signal to the modulation input, the distorted signal used by the feedback divider in the phase locked loop to facilitate modulation of the VCO and effect compensation for modulation distortion resulting from the phase locked loop.

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