Feed forward clock and data recovery unit

Details Feed forward clock and data recovery unit Feed forward clock and data recovery unit

2007-11-06

2007-11-06

Vo, Don N. (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S355000, C375S375000

Reexamination Certificate

active

10810981

ABSTRACT:
Disclosed is a feed forward clock and data recovery unit for recovering a received serial data bit stream having a feed forward phase tracking unit for tracking of a sampling time to the center of a unit interval of the received data bit stream. The feed forward phase tracking unit can include a sampling phase generation unit, an oversampling unit, a serial-to-parallel-conversion unit, a binary phase detection unit, a loop filter, a finite state machine, a binary rotator, and a data recognition unit for recovery of the received data stream which includes a number of parallel data recognition FIR-Filters. Further, each data recognition FIR-Filter can include a weighting unit for weighting data samples of the deserialized data stream, a summing unit for summing up the weighted data samples, and a comparator unit for comparing the summed up data samples with a threshold value.

REFERENCES:
patent: 5400370 (1995-03-01), Guo
patent: 6009132 (1999-12-01), Scholtz
patent: 2002/0080898 (2002-06-01), Agazzi et al.
patent: 2002/0146084 (2002-10-01), Cranford, Jr. et al.
patent: 2003/0031283 (2003-02-01), Bronfer et al.
patent: 2003/0123594 (2003-07-01), Glenn et al.
patent: 2004/0210790 (2004-10-01), Moon et al.
patent: 19922807 (1999-11-01), None
German Office Action dated Sep. 22, 2005.

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