Circuit for detecting a lock of a phase locked loop

Details Circuit for detecting a lock of a phase locked loop Circuit for detecting a lock of a phase locked loop

1989-03-10

1990-05-29

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331DIG2, H03L 708

Patent

active

049299166

ABSTRACT:
A circuit for detecting a lock of a phase locked loop comprising a phase comparator receiving a first signal and a second signal for generating a phase difference signal, a waveform shaping circuit connected to receive the phase difference signal for generating an output signal when the phase difference signal indicates a phase difference exceeding a predetermined value, and a multi-stage counter having a frequency division function and having a reset input connected to receive the output signal of the waveform shaping circuit. An input control circuit is connected to receive the first signal and an output of the multi-stage counter and has an output connected to an input of the multi-stage counter for allowing the first signal to be applied to the multi-stage counter only when the output of the multi-stage counter is at a predetermined logic level. The output of the counter provides an lock output.

REFERENCES:
patent: 4122405 (1978-10-01), Tietz et al.

Affiliated with

Also associated with

Rating

Circuit for detecting a lock of a phase locked loop does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit for detecting a lock of a phase locked loop, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for detecting a lock of a phase locked loop will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-523595