Phase locked loop having parallel comparators

Details Phase locked loop having parallel comparators Phase locked loop having parallel comparators

1989-05-31

1990-11-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 11, 331 27, 307528, 328134, H03L 787

Patent

active

049704737

ABSTRACT:
A circuit for high-efficiency tuning of video frequencies comprises a closed control loop including a voltage controlled oscillator, a frequeny divider, a phase comparator, and a low-pass filter cascade interconnected via respective inputs and outputs, with the filter output connected to the oscillator input to form the loop. The circuit further comprises a second comparator connected in parallel to the phase comparator between the frequency divider output and the low-pass filter input to compare a reference frequency to a frequency from the divider when the values of each frequencies lie far apart.

REFERENCES:
patent: 3375448 (1968-03-01), Newman et al.
patent: 3703686 (1972-11-01), Hekimian
patent: 4069462 (1978-01-01), Dunn

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