Synchronized oscillator lock detector

Details Synchronized oscillator lock detector Synchronized oscillator lock detector

1985-04-17

1986-04-22

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, 331DIG2, H03L 706

Patent

active

045845379

ABSTRACT:
An all digital circuit which operates with an electronic oscillator of the type that receives an input signal and synchronizes its oscillations to transitions in the input signal, comprises: a pulse-generating circuit 20 coupled to the oscillator for digitally forming periodic pulses in synchronization with selected oscillations of the oscillator; a detecting circuit 30 coupled to receive the pulses and the input signal for digitally detecting whether a transition occurs in the input signal in the absence of a pulse; and a counting circuit 40 coupled to the detecting circuit for digitally counting so long as the detecting circuit fails to detect a transition in the absence of a pulse and for indicating the oscillator is synchronized when the count reaches a predetermined number.

REFERENCES:
patent: 3982190 (1976-09-01), Schaefer
patent: 4473805 (1984-09-01), Guhn

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