Clock control circuit for phase control

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

H - Electricity

03

L

344/24, 328/88

H03L 7/06 (2006.01) H04J 3/06 (2006.01) H04L 7/00 (2006.01)

Patent

CA 1270552

CLOCK CONTROL CIRCUIT FOR PHASE CONTROL 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-outcircuit 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.

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