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Techniques for generating fractional periodic signals

  • US 8,537,956 B1
  • Filed: 11/24/2010
  • Issued: 09/17/2013
  • Est. Priority Date: 11/24/2010
  • Status: Active Grant
First Claim
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1. A circuit comprising:

  • a fractional phase-locked loop circuit comprising phase detection circuitry, an oscillator circuit that generates a first periodic signal, and a frequency divider circuit that divides a frequency of the first periodic signal by a frequency division value to generate a frequency of a second periodic signal, wherein the second periodic signal is provided to the phase detection circuitry; and

    a delta sigma modulator circuit comprising a first accumulator that performs a first addition, first storage circuits that store signals based on the first addition received from the first accumulator, a first multiplexer that receives the signals based on the first addition from the first storage circuits and that provides one of the signals based on the first addition as a first selected signal, and a logic circuit that controls the frequency division value based on the first selected signal.

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