Patent ID: 6587007
Filing Date: 2003-07-01
Classification: H03B,H03K

Abstract:
A voltage controlled oscillator (VCO), comprising:N series-coupled delay stages, each of said stages providing at least a first delay path and a second delay path and contributing a phase shift at a VCO frequency of interest equal to one of 180Â°/N and 360Â°/N , where N is an integer greater than one; for each of said N delay stages, a delay interpolator, coupled to interpolate between said first and said second delay path; for each of said N delay stages, a bandpass frequency selective network that rejects phase noise for said VCO; and a path between a last of said delay stages and a first of said delay stages providing an amount of phase shift selected from 180Â° and 0Â°; where total phase shift through said VCO is 360Â° at said VCO frequency of oscillation.