Clock pulse signal generator system

Details Clock pulse signal generator system Clock pulse signal generator system

1983-05-31

1986-07-01

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 14, 331 18, 331 25, 331 49, 331 55, H03L 706, H03L 714

Patent

active

045982570

ABSTRACT:
A clock pulse generator system for providing a highly stable clock signal consists of two separate redundant clock signal generators which are controlled to operate in dead synchronization with each other. A microprocessor controlled digital phase lock loop operates to control each of the two clock signal generators and selects among a plurality of operating states such that the average dynamic phase difference in the two clock pulse signals generated is practically zero. Furthermore, the instantaneous dynamic phase difference does not exceed the phase noise of the voltage controlled crystal oscillators of the phase lock loops and, in one embodiment, is normally less than ten pico seconds, each phase lock loop comprising means for performing a fine, as well as coarse, phase comparison among internally or externally generated reference signals, only one of which is the highly stable clock signal output.

REFERENCES:
patent: 3769607 (1973-10-01), Thelen
patent: 4164629 (1979-08-01), Ollivier et al.
patent: 4276512 (1981-06-01), Wittke
patent: 4305045 (1981-12-01), Metz et al.
patent: 4380742 (1983-04-01), Hart

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