Timing measurement for jitter display

Details Timing measurement for jitter display Timing measurement for jitter display

1988-09-19

1989-12-12

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

358139, 364481, 371 204, 375118, H04B 1700

Patent

active

048872792

ABSTRACT:
A timing measurement system for displaying data path and clock jitter moves an internal copy of the data clock with respect to the incoming data and clock to acquire sets of samples for each data path and the clock at sequential delay intervals. A reference time is established by examining the clock sets and determining skew extremes defined by the times when the values within a set are no longer all at one state and when the values are all at the other state. The skew extremes are averaged to establish the reference time. Likewise each data path set is examined to determine skew extremes, and the skew extremes are displayed as shaded areas with respect to the reference time for each data path. Also the clock signal is converted to a stable clock signal that is also compared in a like manner to the input clock to establish skew extremes that are displayed about the reference time as clock jitter.

REFERENCES:
patent: 4320516 (1982-03-01), Kammerlander
patent: 4350879 (1982-09-01), Feher
patent: 4757452 (1988-07-01), Scott et al.
patent: 4777640 (1988-10-01), Turner et al.
patent: 4796259 (1989-01-01), Troy

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