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Digitally controlled oscillator circuit

  • US 5,739,725 A
  • Filed: 01/29/1996
  • Issued: 04/14/1998
  • Est. Priority Date: 01/29/1996
  • Status: Expired due to Fees
First Claim
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1. An oscillator circuit, comprising:

  • a phase comparator having first and second clock signal inputs, and outputs having predetermined relationships to characteristics of the first and second clock signals;

    a ring oscillator circuit;

    a first control means connected to a first output of the phase comparator for generating a first control current, the first control current having a value within a first range of control currents, the first control current being supplied to the ring oscillator, resulting in the adjustment of an output frequency of the ring oscillator circuit over a first frequency adjustment range, the first control means also providing as an output a first set of digital signals;

    a second control means connected to an output of the first control means for generating a second control current, the second control current having a value within a second range of control currents, the second control current being supplied to the ring oscillator circuit, resulting in adjustment of the output frequency of the ring oscillator circuit over a second frequency adjustment range.

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