Automatic sweep-to-lock circuit for a phase-locked loop

Details Automatic sweep-to-lock circuit for a phase-locked loop Automatic sweep-to-lock circuit for a phase-locked loop

1990-12-21

1992-02-25

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 8, 331 17, 331DIG2, H03L 712, H03L 7095

Patent

active

050917021

ABSTRACT:
A method for a phase-locked loop, which circuit includes, in a preferred embodiment, a resistor to unbalance phase detector outputs to an operational amplifier to cause the voltage output of the operational amplifier to sweep and thus cause the frequency output of a voltage controlled oscillator to sweep. Simple circuitry detects correct lock and terminates sweeping; or, if lock is not achieved, causes the output of the operational amplifier to remain at a low level until the operational amplifier is reset and then permits resweep. Very little auxiliary circuitry is required.

REFERENCES:
patent: 4240076 (1980-12-01), Williamson
Gardner, F. M.; Phaselock Techniques; 1979 John Wiley & Sons, Inc.; pp. 82-83.

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