Parallel analog and digital control loops for phase locking prec

Details Parallel analog and digital control loops for phase locking prec Parallel analog and digital control loops for phase locking prec

1977-06-14

1978-08-15

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 3, 331 11, 331 17, 331 25, H03B 304

Patent

active

041076230

ABSTRACT:
A control device for accurately maintaining the frequency of a quartz crystal oscillator. The control device includes reference oscillators and two control loops in parallel, a first digital control loop providing coarse adjustment of the quartz oscillator frequency and a second, analog control loop providing fine adjustment.

REFERENCES:
patent: 3882412 (1975-05-01), Apple, Jr.

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