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Apparatus and methods for frequency control in a multi-output frequency synthesizer

  • US 8,041,310 B2
  • Filed: 10/01/2007
  • Issued: 10/18/2011
  • Est. Priority Date: 10/01/2007
  • Status: Active Grant
First Claim
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1. A frequency synthesizer circuit, comprising:

  • a first phase-locked loop circuit configured to generate a first output signal phase-locked to a reference clock signal;

    a second phase-locked loop circuit configured to generate a second output signal phase-locked to the same reference clock signal; and

    a frequency correction circuit configured to correct the first output signal by adjusting a first frequency-division ratio in the first phase-locked loop circuit and generating a control signal to adjust the frequency of the reference clock signal, in response to a detected frequency error in the first output signal.

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