Digital lock detector for a phase-locked loop

Details Digital lock detector for a phase-locked loop Digital lock detector for a phase-locked loop

1984-01-03

1986-10-14

Miller, Stanley D.

Oscillators

Relaxation oscillators

328155, 331 25, 331DIG2, 377851, H03D 1300, H03K 906, H03L 700

Patent

active

046175202

ABSTRACT:
A digital lock detector for a phase-locked loop accumulates out-of-lock pulses which are derived from a high frequency clock signal. The out-of-lock pulses are gated by an out-of-phase indicator signal and a pulse centered around the phase-locked loop output cycles to reduce the effect of relative phase jitter between the input and output signals of the phase-locked loop. The digital lock detector utilizes two counters in series which are reset independently to provide resistance to fading signal conditions. In addition, the lock detector circuit requires several consecutive long out-of-lock indications before an out-of-lock condition is indicated.

REFERENCES:
patent: 3684965 (1972-08-01), Gautney et al.
patent: 3721906 (1973-03-01), Geesen et al.
patent: 3962645 (1976-06-01), Steward
patent: 3982190 (1976-09-01), Schaefer
patent: 3988696 (1976-10-01), Sharpe
patent: 4021653 (1977-05-01), Sharp et al.
patent: 4122405 (1978-10-01), Tietz et al.
patent: 4302817 (1981-11-01), Labedz
patent: 4310805 (1982-01-01), Hackert et al.
patent: 4437072 (1984-03-01), Asami

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