System and method for recovering data encoded using manchester c

Details System and method for recovering data encoded using manchester c System and method for recovering data encoded using manchester c

1997-07-15

1999-04-06

Chin, Stephen

Pulse or digital communications

Synchronizers

Self-synchronizing signal

375282, 375333, 375279, 375329, 375359, 341 70, 341 68, 329304, 329310, H04L 742, H04L 2710, H04L 2722, H03D 322

Patent

active

058927972

ABSTRACT:
A data and clock recovery circuit includes a front end circuit for receiving a data signal encoded with a Manchester or other bi-phase level code having a sequence of bit frames, and for outputting a recovered data signal and a recovered clock signal in accordance with transitions in the data signal that overlap with a window signal. A window generation circuit generates the window signal in accordance with a delay control signal, and includes circuitry that delays and transforms the recovered clock signal into the window signal. A delay control circuit generates and adjusts the delay control signal. A phase comparison circuit compares the recovered clock signal with leading and lagging portions of the window signal, and generates signals that adjust the delay control signal when the recovered clock signal overlaps with either of the leading and lagging portions of the signal. The delay control signal is adjusted so as to re-position the window signal so that the recovered clock signal is positioned between the leading and lagging portions of the window signal.

REFERENCES:
patent: 4017803 (1977-04-01), Baker
patent: 4730347 (1988-03-01), Paul
patent: 5127023 (1992-06-01), Tash et al.
patent: 5224126 (1993-06-01), Myers et al.
patent: 5574399 (1996-11-01), Oura et al.
patent: 5636248 (1997-06-01), Tash et al.

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