Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Reexamination Certificate
2001-11-29
2008-08-05
Ghayour, Mohammed (Department: 2611)
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
C375S371000, C375S214000, C375S215000, C375S362000, C375S373000, C331S004000, C331S012000, C331S025000, C331S034000, C388S911000, C455S180300, C455S260000
Reexamination Certificate
active
07409029
ABSTRACT:
There is provided a flexible transmission device capable of automatically setting an optimal point for a signal decision making with high accuracy, so that highly reliable high-quality signal regeneration control is achieved. A clock timing extraction circuit dynamically sets a frequency-dividing ratio based on the transmission rate of an input signal to perform a phase synchronization control so that there is a fixed phase difference between the input signal and an oscillation output, whereby clock timing based on the transmission rate can be extracted. A regeneration control circuit sequentially sweeps a voltage threshold level and the phase of the extracted cock with respect to the input signal and determines whether the levels of adjacent monitor points match, whereby a decision point within the valid zone of the eye pattern can be automatically measured and used as the optimal point for regeneration control.
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Ito Sunao
Kawasaki Wataru
Fujitsu Limited
Ghayour Mohammed
Katten Muchin & Rosenman LLP
Torres Juan Alberto
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