Filtering circuit for a phase-locked loop

Details Filtering circuit for a phase-locked loop Filtering circuit for a phase-locked loop

1977-07-12

1978-10-17

Kominski, John

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, H03B 304

Patent

active

041211715

ABSTRACT:
The invention relates to a novel filtering circuit whereby a phase detected output control signal is filtered and utilized to provide greater stability in a phase-locked loop. The filtering circuit is placed in the connecting path between a phase detector and an oscillator; the oscillator supplies output signals, having a repetition rate which depends on the instantaneous values of the filtered control signal. The filtering circuit comprises an adder which adds the phase detected control signal to a signal corresponding to the preceding filtered control signal multiplied by a constant factor which is less than unity (<1).

REFERENCES:
patent: 4027274 (1977-05-01), Fukui et al.

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