Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
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.
Mis David
NEC Corporation
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