Patent ID: 6636122
Filing Date: 2003-10-21
Classification: H03D,H03L

Abstract:
A feedback comprising:at least one ramp generator for generating a first ramp-like signal in response to a first edge of a first input pulse signal having a first duration, the at least one ramp generator further generating a second ramp-like signal in response to a second edge of the first input pulse signal; a clocked analog to digital converter circuit located downstream of the ramp generator and being actuated by a first edge of a second input signal having a second duration to produce a first digital sample, the clocked analog to digital converter circuit further being actuated by a second edge of the second input pulse signal to produce a second digital sample; a conversion circuit for generating a digital correction signal by differencing the first digital sample from the second digital sample wherein the digital correction signal represents a difference between the first duration and the second duration; and a digital low pass filter for filtering the digital correction signal to produce a filtered correction signal.