Loss-of-phase-lock indicator circuit

Details Loss-of-phase-lock indicator circuit Loss-of-phase-lock indicator circuit

1980-11-03

1983-06-14

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 25, 331DIG2, H03L 712

Patent

active

043885985

ABSTRACT:
A loss-of-phase-lock indicator circuit is described which detects an out-limit voltage, whether steady or transitory. A pair of comparators, one for the high limit and the other for the low limit, are inserted in series between the tuning voltage and the sweep feedback amplifier, and are dc-coupled to the peak detector in the failure circuit. Additionally, a "dither" voltage is added in series with the phase detector, which ac voltage is large enough to swing the tuning voltage between limits at the loop amplifier output, but small enough to produce little effect on the output during phase lock.

REFERENCES:
patent: 3080533 (1963-03-01), Edwards
patent: 3805183 (1974-04-01), Lance
patent: 3932821 (1976-01-01), McClaskey
patent: 3961282 (1976-06-01), Chen et al.
patent: 4125815 (1978-11-01), Kirschner
patent: 4131862 (1978-12-01), Black et al.
patent: 4151463 (1979-04-01), Kibler
patent: 4316154 (1982-02-01), Krause

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