Pulse or digital communications – Testing – Phase error or phase jitter
Reexamination Certificate
2011-03-22
2011-03-22
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Testing
Phase error or phase jitter
Reexamination Certificate
active
07912117
ABSTRACT:
A method of measuring transport delay and jitter with a realtime oscilloscope using cross-correlation acquires waveforms from two test points in a system under test. Clock recovery is run on both waveforms to obtain respective rates and offsets. A time offset between the two waveforms is computed. The jitter from the two test points is filtered and a mean-removed cross-correlation coefficient is computed from the filtered jitters. A fractional delay is computed using interpolation based on LMS error, and the respective computational components are summed to compute a transport delay between the two test points. The transport delay may be used to adjust clock edges from one waveform for comparison with data transition edges of the other waveform to measure jitter.
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Calvin John C.
Sepp Kalev
Tan Kan
Ghebretinsae Temesghen
Gray Francis I.
Lenihan Thomas F.
Tektronix Inc.
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