Eye violation and excess jitter trigger

Details Eye violation and excess jitter trigger Eye violation and excess jitter trigger

2011-07-19

2011-07-19

Payne, David C. (Department: 2611)

Pulse or digital communications

Testing

Phase error or phase jitter

Reexamination Certificate

active

07983332

ABSTRACT:
An eye violation and excess jitter trigger for a digital signal uses a mask within a unit interval of the digital signal, such as a rectangular mask having corners defined by a high threshold, a low threshold, an early clock and a late clock, the early and late clocks being derived from a reference clock. The reference clock may be a recovered clock derived from the digital signal or from high and low threshold comparator outputs, or may be an external clock. For the excess jitter trigger, which is a special case of the eye violation trigger, the high and low thresholds are essentially equal. A status of the digital signal with respect to the mask is determined using the high and low thresholds and the early and late clocks, and a violation signal is output when the status indicates that a portion of the digital signal crossed into the mask. The violation signal may then be used to trigger data acquisition or for other purposes.

REFERENCES:
patent: 4218771 (1980-08-01), Hogge, Jr.
patent: 5491722 (1996-02-01), Jones et al.
patent: 6577964 (2003-06-01), LeCheminant et al.
patent: 2007/0253474 (2007-11-01), Smith
patent: 1460793 (2004-09-01), None
patent: 1460793 (2004-09-01), None
XYZ's of Oscilloscopes.

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