Phase locked crystal oscillator implemented with digital logic e

Details Phase locked crystal oscillator implemented with digital logic e Phase locked crystal oscillator implemented with digital logic e

1983-01-25

1985-04-23

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 27, 331 36R, 331158, 331177R, 331179, H03B 532, H03L 708

Patent

active

045132550

ABSTRACT:
A quartz crystal oscillator is controlled entirely by digital elements to phase lock with a reference square wavetrain by alternately switching the tuning circuit of the oscillator between first and second configurations. The ratio of the times during which the tuning circuit is in its respective configurations is a function of the relative phases of the oscillator output and the reference wavetrain and serves to determine the precise frequency of the oscillator so as to keep its output locked to the phase of the reference wavetrain.

REFERENCES:
patent: 3560879 (1971-02-01), Fuchs
patent: 4179671 (1979-12-01), Yoshida et al.
patent: 4330759 (1982-05-01), Anderson
patent: 4376919 (1983-03-01), Konno et al.

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