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Fractional-N offset phase locked loop

  • US 7,098,754 B2
  • Filed: 01/31/2005
  • Issued: 08/29/2006
  • Est. Priority Date: 01/31/2005
  • Status: Active Grant
First Claim
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1. A phase locked loop system comprising:

  • loop circuitry adapted to provide an output signal based on a divided reference signal;

    combiner circuitry adapted to combine an initial fractional divide value and a modulation signal to provide a combined fractional divide value; and

    a fractional-N divider adapted to fractionally divide a reference signal based on the combined fractional divide value to provide the divided reference signal such that the output signal is phase modulated.

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