H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 7/00 (2006.01) H03L 7/087 (2006.01) H04L 7/033 (2006.01)
Patent
CA 2061524
The phase/frequency comparator comprises a known phase comparator for comparing the phases of an digital input signal with a clock signal of which the period varies to within one time interval with respect to the period of the input signal. Such a phase comparator produces a first error signal whose sign, and preferably magnitude, vary as a function of the difference between the phases. The phase/frequency comparator is intended to produce a second error signal which replaces the first error signal and whose sign, and preferably magnitude, vary as a function of the difference between the periods. According to a preferred embodiment, a phase shift assessing circuit detects a predetermined phase shift, e.g. substantially equal to 0, between the clock signal and the input signal during a clock period. A sign detecting circuit detects the sign of the difference between the periods for the predetermined phase shift, and a logic circuit derives two signals having pulse widths as a function of said periods thereby deriving the second error signal by differentiation. The phase/frequency comparator is particularly intended for a phase locked loop for recovering the timing of the input signal.
Houeix Herve Francois
Sari Hikmet
Fetherstonhaugh & Co.
Sat (societe Anynyme de Telecommunications)
LandOfFree
Phase/frequency comparator for timing recovering circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Phase/frequency comparator for timing recovering circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase/frequency comparator for timing recovering circuit will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1657615