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

H - Electricity

03

L

H03L 7/12 (2006.01) H03L 7/095 (2006.01)

Patent

CA 2058005

PHA 40.607 12.11.1991 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 circuity detects correct lock and terminates sweeping; or, if lockis 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.

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