PLL (Phase-Locked Loop) circuit

Pulse or digital communications – Synchronizers – Synchronizing the sampling time of digital data

Reexamination Certificate

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Details

C375S226000

Reexamination Certificate

active

07050520

ABSTRACT:
If a phase difference between a synchronizing source signal F1and a comparison signal F2is higher than a first lower limit a or lower than a first upper limit b, a comparator3selects this phase difference, if the phase difference is not higher than the lower limit a, selects the lower limit a, and if the phase difference is not lower than the upper limit b, selects the upper limit b, and a divider7A outputs a comparison signal F2obtained by dividing a frequency of an output signal F0, to change a phase of the signal F2so that if the phase difference is not higher than a second lower limit e lower than the lower limit a, the phase difference may become the lower limit a and, if the phase difference is higher than a second upper limit f higher than the upper limit b, the phase difference may become the upper limit b.

REFERENCES:
patent: 6188740 (2001-02-01), Tomaru
patent: 2002/0163391 (2002-11-01), Peterzell
patent: 2-180429 (1990-07-01), None
patent: 2000-68824 (2000-03-01), None

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