H - Electricity – 04 – L
Patent
H - Electricity
04
L
325/120
H04L 27/22 (2006.01) H03L 7/093 (2006.01) H04L 27/233 (2006.01) H04L 27/00 (2006.01)
Patent
CA 1318360
ABSTRACT OF THE DISCLOSURE A jitter cancelling apparatus include a carrier phase locked loop comprising first phase rotator for producing a first phase-rotated signal by effecting a first phase rotation of a received signal, using a first phase control signal; first phase detecting means for detecting a phase of the first phase-rotated signal and producing a first detected phase signal; and control means having a time constant for processing the first detected phase signal, to obtain the first phase control signal. A predictive jitter canceller comprises second phase rotator for producing a second phase-rotated signal by effecting a second phase rotation of the first phase-rotated signal, using a second control signal; second phase detecting means for detecting a phase of the second phase-rotated signal and producing a second detected phase signal; and predicting means responsive to the first detected phase signal for obtaining the second control signal. Phase jitter measuring means are responsive to the first detected phase signal for producing a phase jitter frequency signal by measuring a frequency of a phase jitter of the received signal. Comparing means produce a first comparison result signal, when the phase jitter frequency signal is greater than a predetermined value and a second comparison result signal, when the phase jitter frequency signal is smaller than the predetermined value. Predicting means control means activate the predicting means in response to the first comparison result signal and deactivate the predicting means in response to the second comparison result signal.
606715
Corporation Nec
G. Ronald Bell & Associates
LandOfFree
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