Pulse or digital communications – Synchronizers – Self-synchronizing signal
Patent
1996-02-07
1997-06-17
Chin, Wellington
Pulse or digital communications
Synchronizers
Self-synchronizing signal
375238, 375340, 375348, 375371, H03K 708, H03D 100, H04L 702, H04L 700
Patent
active
056405235
ABSTRACT:
A phase detector detects a transition edge on a received data signal and generates a pump-down reference pulse and a pump-up, variable width pulse indicative of phase to synchronize a local clock with the received data signal. The variable width pulse overlaps in time with the reference pulse. The reference pulse is subtracted from the variable width pulse, and the resulting difference signal is supplied in an integrated format to a voltage controlled oscillator (VCO) that controls the frequency of the local clock. When the phase detector is balanced, the variable width pulse and the reference pulse substantially cancel out one another, providing for relatively reduced jitter for the local clock.
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Chin Wellington
Cypress Semiconductor Corporation
Shankar Vijay
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