Time and frequency control unit

Details Time and frequency control unit Time and frequency control unit

1975-09-19

1976-08-10

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

325 63, 325390, 325418, 328 48, 328155, 331 39, 331 41, 331 43, 331175, H03B 304

Patent

active

039744574

ABSTRACT:
The present invention relates to a time and frequency control unit which is apable of compensating for long-term crystal oscillator drift and other errors in a reference oscillator signal by both coarse and fine (vernier) controlling. The invention takes the reference oscillator frequency, f.sub.o, divides it by a controlled factor a and mixes f.sub.o with f.sub.o /a to produce an f.sub.o + f.sub.o /a
Signal. The f.sub.o + f.sub.o /a
Signal is then divided by a second controlled factor b and mixed again with f.sub.o to yield a signal of frequency f.sub.o .+-. (f.sub.o + f.sub.o /a) 1/b,
Where f.sub.f, the final output frequency, is determined after a filter stage sets the operation sign of the above expression (to plus or minus). Where f.sub.f is intended to be constant with a changing f.sub.o, the values of a and b are changed. From the above expression, it is apparent that a change in a makes a fine correction whereas a change in b translates the frequency with a coarse adjustment.

REFERENCES:
patent: 3560880 (1971-02-01), Easton et al.
patent: 3662269 (1972-05-01), Osborne et al.

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