Phase-lock-loop lock indicator circuit

Details Phase-lock-loop lock indicator circuit Phase-lock-loop lock indicator circuit

1990-06-25

1991-04-16

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331DIG2, H03L 706

Patent

active

050086359

ABSTRACT:
A PLL lock indicator circuit for indicating when a phase-lock-loop circuit is in lock includes a gate circuit coupled to the phase/frequency detector of the phase-lock-loop circuit for providing an output logic signal that is responsive to output logic signals from the phase/frequency detector being in a predetermined state. A counter circuit is enabled by the output logic signal of the gate circuit for providing an output logic signal when the counter circuit has reached a predetermined count. A latch circuit is responsive to the output logic signal of the counter circuit for providing a lock signal at an output terminal of the circuit, the lock signal being indicative of when the PLL circuit is in phase lock.

REFERENCES:
patent: 4292916 (1990-05-01), Fukuda

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