Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1998-11-19
2000-11-28
Chin, Stephen
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
375327, 327150, 329307, H03D 324
Patent
active
061545120
ABSTRACT:
The invention relates to methods and apparatus for synchronizing a local data clock with timing information from received data, during a fraction of a frame period. The apparatus includes a transition detect unit, a digital phase comparator, a phase regulator, and a control unit, for detecting the bit transitions of received data, determining the phase difference between timing information and a local data clock, advancing or retarding the local data clock, and enabling and disabling the synchronization in accordance with a predetermined rate.
REFERENCES:
patent: 4085288 (1978-04-01), Viswanathan
patent: 4166979 (1979-09-01), Waggener
patent: 4280099 (1981-07-01), Rattlingourd
patent: 4972444 (1990-11-01), Melrose et al.
patent: 5081655 (1992-01-01), Long
patent: 5278702 (1994-01-01), Wilson et al.
patent: 5398263 (1995-03-01), Vanderspool, II et al.
patent: 5920600 (1999-07-01), Yamaoka et al.
Chin Stephen
Jiang Lenny
Nortel Networks Corporation
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