Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1996-03-29
1997-09-02
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 17, 331 25, 331 27, H03L 7093
Patent
active
056636857
ABSTRACT:
Compensation circuits are disclosed for correcting phase offset during apparent phase lock of a dual flip-flop phase detector type of phase locked loop, which phase offset is due to circuit delays in the phase detector. Simultaneous "pump up" and "pump down" signals, present even during apparent phase lock because of such circuit delays, are peak sampled through long lime constant filters and summed to derive a compensating signal which is applied to the reference input to the differential amplifier which controls the local oscillator, thereby exactly counteracting the offset component of the voltage appearing at the signal input to the differential amplifier which is developed during normal operation of the phase detector, filter and summing circuit of the phase locked loop at apparent phase lock.
REFERENCES:
patent: 4599570 (1986-07-01), Cloke
Bull HN Information Systems Inc.
Grimm Siegfried H.
Phillips J. H.
Solakian J. S.
LandOfFree
Dual flip-flop detector type phase locked loop incorporating dyn does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dual flip-flop detector type phase locked loop incorporating dyn, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual flip-flop detector type phase locked loop incorporating dyn will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-312247