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Integrated, digitally-controlled crystal oscillator

  • US 6,768,389 B2
  • Filed: 09/23/2002
  • Issued: 07/27/2004
  • Est. Priority Date: 09/23/2002
  • Status: Expired due to Term
First Claim
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1. A variable frequency oscillator circuit, comprising:

  • a resonant component;

    a sustaining amplifier connected to said resonant component and generating an output signal, a first feedback loop connected to said sustaining amplifier for an in-phase component of said output signal, said first feedback loop including a limiter having an output amplitude signal that is substantially independent of its input amplitude signal; and

    a second feedback loop connected to said sustaining amplifier for a quadrature signal component of said output signal bypassing said limiter, wherein the output frequency of said oscillator circuit is varied by altering said quadrature signal component.

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