Patent ID: 6249685
Filing Date: 2001-06-19
Classification: H03L

Abstract:
A phase-lock-loop circuit, comprising:an oscillator;a phase frequency detector;a filter circuit;a first divider circuit;a digital to analog converter;a second divider circuit coupling said oscillator toa fractional timing circuit;a charge pump coupling said phase detector to said filter circuit;a voltage controlled oscillator coupling said filter circuit to said first divider circuit;an L-Bit accumulator coupling said first divider circuit to said digital-to-analog converter;a fractional charge pump coupling said digital-to-analog converter to said charge pump, to said filter circuit and to said fractional timing circuit;said fractional timing circuit coupling said voltage controlled oscillator to said oscillator, said second divider circuit and to said phase frequency detector; andsaid first divider circuit further coupling said voltage controlled oscillator to said L-Bit accumulator and to said phase frequency detector.