Numerically controlled oscillator

Details Numerically controlled oscillator Numerically controlled oscillator

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

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