Pulse or digital communications – Repeaters – Testing
Patent
1992-12-15
1995-03-28
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375371, H04L 700
Patent
active
054024439
ABSTRACT:
A jitter extraction circuit, which includes a cyclic phase differentiator, a control loop, and a jitter integrator, measures the jitter of a recovered clock signal formed from an incoming data bit stream. The phase differentiator differentiates a phase data word, which includes both a jitter component and a delta frequency component, to produce a differentiated phase data word. The control loop estimates and removes the delta frequency component to produce a filtered data word which primarily represents the jitter component. The jitter integrator recovers the original jitter component by integrating the filtered data word to produce a jitter data word. The jitter of the recovered clock signal is determined by the statistics of the jitter data words.
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Chin Stephen
May Timothy J.
National Semiconductor Corp.
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