G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 29/02 (2006.01) H04L 1/20 (2006.01)
Patent
CA 2111452
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.
National Semiconductor Corporation
Smart & Biggar
LandOfFree
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