Pulse or digital communications – Synchronizers – Self-synchronizing signal
Patent
1995-11-30
1998-06-02
Chin, Stephen
Pulse or digital communications
Synchronizers
Self-synchronizing signal
375359, 375361, 375373, 327142, 327160, 331 1A, 331 34, H04L 702
Patent
active
057612552
ABSTRACT:
A clock recovery unit for recovering a clock embedded in a data communication is disclosed. The clock recovery unit includes an oscillator (50) operating at a frequency close to that of the clock embedded in the data communication. The clock recovery unit also includes an edge detector (30) that produces a synchronization pulse with each transition in the data communication. The edge detector is coupled to the oscillator to force a transition in the oscillator in synchronization with the synchronization pulse produced by the edge detector. A start-up latch (10) that starts and stops the oscillator also forms part of the clock recovery unit. The start-up latch starts the oscillator at the beginning of the data communication, with no preamble bits required. For low-power consumption in stand-by mode, a counter (40) coupled to the start-up latch stops the oscillator after data has been determined not to be present for a preset period of time. Preferably, the start-up latch, edge detector, counter, and oscillator are incorporated into an Application Specific Integrated Circuit (ASIC).
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Chin Stephen
Deppe Betsy L.
The Boeing Company
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