Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1983-02-28
1985-07-23
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 11, 331 25, H03L 706
Patent
active
045311021
ABSTRACT:
A macro phase detector responds to large phase deviation between a locally generated signal and a reference signal for actuating a successive frequency approximation register to effect major count alteration in a counter for controlling a digital-to-analog converter and, in turn, a voltage controlled oscillator. Small phase error is detected by a phase detector, averaged, and employed to alter the count in the counter for introducing sensitive frequency adjustment. A second counter is clocked by the phase detector at one half the rate of the first counter and is used to update the first counter each time the phase difference reverses polarity. Loss of reference signal activates a detector for freezing the count in the counter to maintain frequency and phase within the accuracy of the controlled oscillator.
REFERENCES:
patent: 4034310 (1977-07-01), Coe
patent: 4135165 (1979-01-01), Coe
patent: 4144489 (1979-03-01), Ward et al.
patent: 4151485 (1979-04-01), LaFratta
patent: 4272729 (1981-06-01), Riley, Jr.
patent: 4316152 (1982-02-01), Meyer
Makino, M. et al., "A Microprocessor-Controlled Phase-Locked Loop for Network Synchronization", Conference: Proceedings of the 1979 International Symposium on Circuits and Systems, Tokyo, Japan, (Jul. 17-19, 1979), pp. 804-805.
Drzala Christopher W.
Whitlock Jonathan B.
GK Technologies, Incorporated
LaRoche Eugene R.
Pascal Robert J.
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