Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1998-03-27
1999-10-26
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327162, 327149, 331DIG2, H03L 706
Patent
active
059735252
ABSTRACT:
In the present invention, when a phase comparison circuit, which compares the phase of a reference clock divided by a frequency divider that frequency divides a supplied clock, to that of a variable clock, detects the phase-matching of the two clocks, it generates a phase synchronization detection signal, and this phase synchronization detection signal increases the frequency division ratio of a frequency divider, lowering the frequency of operation of the phase comparator. The present invention is further characterized in that, at reset, when an inactive state becomes an active state, the time required to phase synchronize both clocks is shortened by resetting the above-described phase synchronization detection signal, thereby setting the frequency division ratio of the frequency divider to its original low state, and the frequency of operation of the phase comparator to its original high state. In accordance with the above-described invention, when phase synchronization is detected in an active state, the frequency division ratio of the frequency divider is increased, and the frequency of operation of the phase comparator is lowered, thus curbing power consumption. Then, at reset, this phase synchronization detection signal is reset, thus returning the frequency division ratio of the frequency divider to its original low state, and raising the frequency of phase comparator operation.
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Callahan Timothy P.
Fujitsu Limited
Nguyen Hai L.
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