Phase lock loop with narrow band lock-in and wideband acquisitio

Details Phase lock loop with narrow band lock-in and wideband acquisitio Phase lock loop with narrow band lock-in and wideband acquisitio

1977-10-13

1978-12-26

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 17, 331 25, H03B 304

Patent

active

041318625

ABSTRACT:
A phase lock loop operable with narrow band filtering characteristics in-lock and wideband acquisition characteristics when an out-of-lock condition is detected. The phase lock loop comprises a phase detector coupled to a differential amplifier to which a step ramp voltage is also coupled when an a.c. signal, which indicates an out-of-lock condition, is coupled from the phase detector to an out-of-lock detector. The a.c. signal from the phase detector also causes a switch means to short out a narrow band filter which is serially coupled with a wideband filter between the differential amplifier and a voltage controlled oscillator. The frequency of the voltage controlled oscillator is caused to vary by the a.c. signal until lock-in is achieved at which time, the out-of-lock detector stops and holds the step ramp voltage at the value required to achieve lock and the switch means reintroduces the narrow band filter to the loop. The phase lock loop acquisition characteristics are not limited by the required filtering characteristics.

REFERENCES:
patent: 3363194 (1968-01-01), Hileman
patent: 4000476 (1976-12-01), Walker et al.
patent: 4027274 (1977-05-01), Fukui et al.

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