Clock control circuit for phase control

Details Clock control circuit for phase control Clock control circuit for phase control

1986-05-23

1987-06-09

Salce, Patrick R.

Electricity: power supply or regulation systems

For phase shift or control

Using a three or more terminal semiconductive device

364484, 364486, 375111, 455260, 455265, 307269, 307511, H03L 706

Patent

active

046722998

ABSTRACT:
There is disclosed a clock circuit for a PBX system that uses phase locked loop technology to perform synchronization between two input signals. The system can switch between different reference sources without introducing error and without requiring the entire circuit to become realigned with the phase of the newly selected reference signal. This is accomplished with a phase build-out circuit that uses a phase locked loop divider to change the phase of the internal control signal to match the phase of the newly selected reference thereby eliminating timing changes on the system clock bus. The system can also be used to change between redundant clock circuits.

REFERENCES:
patent: 4414639 (1983-11-01), Talambrias
patent: 4464771 (1984-08-01), Sorenson
patent: 4495473 (1985-01-01), Treise
patent: 4521744 (1985-06-01), Yamada et al.

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