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Programmable phase shift circuitry

  • US 6,836,164 B1
  • Filed: 11/05/2003
  • Issued: 12/28/2004
  • Est. Priority Date: 11/03/1998
  • Status: Expired due to Term
First Claim
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1. A circuit comprising:

  • a phase detector circuit receiving a reference clock signal and a feedback clock signal;

    a charge pump circuit coupled to the phase detector circuit; and

    a voltage controlled oscillator coupled to the charge pump, wherein the voltage controlled oscillator comprises, a first multiplexer having inputs coupled to first and second outputs of the voltage controlled oscillator, a first variable impedance circuit coupled to a third output of the voltage controlled oscillator and the charge pump circuit, and a first capacitance coupled to the first variable impedance circuit.

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