Phase lock speed-up circuit

Details Phase lock speed-up circuit Phase lock speed-up circuit

1977-10-04

1978-09-19

Kominski, John

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

328127, 331 1A, H03B 304

Patent

active

041157451

ABSTRACT:
This invention concerns a circuit which decreases the time required for certain phase-locked loops to pull in, that is, the time for the frequency of the oscillator which the loop controls to go from some initial error to some specified smaller error. The circuit is utilized with a loop employing an integrating element in the loop filter in conjunction with a logic circuit for indicating out-of-lock condition plus the sign of the frequency error and utilizes a source of direct current (DC) which is connected to the loop filter so as to increase the rate of change of the correction signal to the controlled oscillator and thereby speed-up tuning of the oscillator to the desired frequency.

REFERENCES:
patent: 3828271 (1974-08-01), Schwanauer
patent: 3879676 (1975-04-01), Schulz
patent: 3913022 (1975-10-01), Kinoshita

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