Phase locked loop indicator

Details Phase locked loop indicator Phase locked loop indicator

1978-02-02

1979-04-24

Tokar, M.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

331 25, 331 64, G01R 2300

Patent

active

041514637

ABSTRACT:
The present invention relates to an indicator arrangement for indicating the condition of a phase locked loop. The indicator comprises a flip-flop having its two input terminals connected directly to the input terminals of the phase detector of the phase locked loop in a manner such that under a lock condition the signal at the first input terminal of the flip-flop will be advanced in phase from the signal at the second input terminal. Under such condition a first output signal will be generated at a first output terminal of the flip-flop to activate a "lock" indicating device. When out of lock, the signal at the second input terminal of the flip-flop will be advanced in phase to the signal at the first input terminal and (a) a second output signal will be generated at the first output terminal causing deactivation of the indicating device, and (b) a first output signal will be generated at a second output terminal to activate a no-lock indicating device when desired. Additionally, when the phase locked loop is in a capture process, the flip-flop and the connected indicating device will be caused to oscillate and cyclically switch between the lock and no-lock condition indication.

REFERENCES:
patent: 3521182 (1970-07-01), Stueck
patent: 3961282 (1976-06-01), Chen
patent: 3982190 (1976-09-01), Schaefer

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