Pulse or digital communications – Multilevel – Synchronized
Reexamination Certificate
2007-05-01
2007-05-01
Patel, Jay K. (Department: 2611)
Pulse or digital communications
Multilevel
Synchronized
C375S286000, C375S287000, C375S317000, C375S360000
Reexamination Certificate
active
10366112
ABSTRACT:
Clock recovery of a multi-level (ML) signal can be performed in a two-step process. First, the transitions within the ML signal can be detected by a novel transition detector (TD). And second, the output of the TD circuit can comprise a pseudo-non-return-to-zero (pNRZ) signal that can drive a conventional OOK clock recovery (CR) IC. The TD circuit can convert the edges of the ML signal into the pseudo-NRZ (pNRZ) signal. The TD circuit can capture as many transitions as possible to allow the conventional NRZ clock recovery (CR) chip to optimally perform. The TD circuit can differentiate the ML signal in order to detect the ML signal's transitions.
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Hietala Vincent Mark
Kim Andrew Joo
King & Spalding LLP
Patel Jay K.
Quellan Inc.
Wigmore Steven P.
Ziskind Anna
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