Dual-tracking phase-locked loop

Details Dual-tracking phase-locked loop Dual-tracking phase-locked loop

H - Electricity

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L

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H03L 7/08 (2006.01) H03L 7/093 (2006.01) H03L 7/14 (2006.01) H04J 3/06 (2006.01) H04L 7/00 (2006.01) H04L 7/033 (2006.01)

Patent

CA 1304793

ABSTRACT OF THE DISCLOSURE A dual-tracking phase-locked loop circuit is provided for moving with minimum disruption from conventional PLL operation to processor-controlled tracking of another closely related clock. In addition to conventional PLL components the circuit comprises a processor-controlled up/down counter which may operate alternatively as a link in the loop or as providing the base-line frequency determining value at the time of transition from PLL to processor-controlled tracking operation, thereby ensuring none disruptive transition.

566385

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