Circuit for detecting a lock of a phase locked loop

Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements

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Details

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.

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