Phase lock detector for digital frequency synthesizer

Details Phase lock detector for digital frequency synthesizer Phase lock detector for digital frequency synthesizer

1975-11-28

1976-10-26

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

328133, 328155, 331 25, 331 64, H03B 304

Patent

active

039886964

ABSTRACT:
A phase lock detector for a digital frequency synthesizer. The frequency synthesizer includes a programmable digital frequency divider for the output signal, a reference frequency Fr oscillator and a phase lock loop which controls the frequency of the synthesizer output by comparing the phase of the frequency divider signal with the phase of the reference signal. The frequency Fr of the synthesizer is determined by programming N in the relationship ##EQU1## The phase lock detector includes logic means providing a "window" which is "open" for a count which is symmetrically less than and more than the factor M. The detector does not signal "out-of-lock" condition as long as output from the programmable divider occurs during the time the detector window is open.

REFERENCES:
patent: 3659224 (1972-04-01), Ball
patent: 3893042 (1975-07-01), Whitman et al.
patent: 3956710 (1976-05-01), Seitz et al.

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