Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Reexamination Certificate
2006-03-07
2009-08-04
Tran, Khanh C (Department: 2611)
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
Reexamination Certificate
active
07570725
ABSTRACT:
A numerically controlled oscillator (NCO) is arranged to accumulate control values for each transition of a system clock to provide an accumulation signal and an edge signal. A speed multiplier value (N) is selected to simulate a desired clock resolution of N times the system clock resolution. The multi-phase predictive clock circuit is arranged to provide clock phase output signals that each correspond to a predicted clock phase as if the system clock where running at N times faster than the actual system clock. The edge detector circuit is arranged to compare values of adjacent clock phases to identify a transition in one of the clock phases. The phase encoder circuit is arranged to provide a phase signal that indicates a transition in one clock phase. The edge signal and the phase signal can be used for careful phase alignment control at effectively higher resolution.
REFERENCES:
patent: 5887040 (1999-03-01), Jung et al.
patent: 6363129 (2002-03-01), Agazzi
patent: 7221727 (2007-05-01), Co
Ciccone John
Ciccone Thomas W.
Taylor Richard
Marvell International Ltd.
Tran Khanh C
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