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Systems and methods for frequency modulation adjustment

  • US 7,920,033 B1
  • Filed: 09/28/2007
  • Issued: 04/05/2011
  • Est. Priority Date: 09/28/2006
  • Status: Expired due to Fees
First Claim
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1. A compensation apparatus for use with a phase-locked loop, the compensation apparatus comprising:

  • a scaling network configured to scale an input modulation signal in accordance with a scaling parameter and thereby generate a scaled modulation signal, the scaled modulation signal being applied to a voltage-controlled oscillator of the phase-locked loop;

    a sensing network configured to detect changes in one or more parameters characterizing the voltage-controlled oscillator; and

    a calibration adjustment network configured to adjust the scaling parameter in accordance with the changes in the one or more parameters, wherein the calibration adjustment network comprises;

    a peak detector circuit configured to measure an amplitude of an output signal of the voltage-controlled oscillator; and

    a swept capacitance circuit configured to release a control signal for adjusting the scaling parameter.

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