Digital frequency/phase locked loop

Details Digital frequency/phase locked loop Digital frequency/phase locked loop

1981-07-10

1985-03-12

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 11, 331 17, 331 20, 331 25, 331 27, 331 34, 358158, H03L 718, H03L 722

Patent

active

045047995

ABSTRACT:
A frequency/phase locked loop for providing signals which are frequency and phase locked to signals at a reference frequency from a reference oscillator which is determinative of the frequency stability includes a frequency-controlled generator of a lower frequency stability. The frequency controlled generator is responsive to control signals for switching between first and second frequencies which are substantially higher than the reference frequency. The second frequency is approximately one to ten percent higher than the first frequency. The frequency divider coupled to the frequency generator provides an output signal at the same frequency as the reference oscillator. A digital phase comparator compares the outputs of the frequency divider with the reference signals. A digital integrating stage coupled to the comparator provides the control signals such that during a first portion of a period of the reference signals the first frequency is selected and during a second portion of the period the second frequency is selected.

REFERENCES:
patent: 3927384 (1975-12-01), Jezo
patent: 4144489 (1979-03-01), Ward et al.
patent: 4290028 (1981-09-01), Legrand
patent: 4316151 (1982-02-01), Doms
patent: 4380742 (1983-04-01), Hart
patent: 4418318 (1983-11-01), Swagerty et al.

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