Method and apparatus for recovering data and clock information f

Details Method and apparatus for recovering data and clock information f Method and apparatus for recovering data and clock information f

1983-10-05

1986-03-25

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

375110, 360 42, H03D 322, H04L 2722, H04L 702, G11B 509

Patent

active

045787999

ABSTRACT:
A method and apparatus are disclosed for recovering data and clock information from high speed self-clocking data streams at rates of up to approximately 50 Mbps. The self-clocking data stream has a predetermined bit period and two voltage levels with negative-going and positive-going voltage level transitions. A pulse is generated for each voltage level transition in the coded stream. This pulse is applied to a non-retriggerable one-shot that produces an output pulse that is approximately the duration of one-half of a bit period. After the output pulse of the one-shot terminates, the one-shot is non-retriggerable for a period of time less than the duration of one-half of a bit period. The output pulse from the one-shot provides clock information derived from the coded bit stream. This clock information is provided to the clock input of a bistable storage device and the coded bit stream is applied to a data input to the storage device. In response to the clock input, the bistable storage device decodes the coded bit stream to provide decoded data information at an output.

REFERENCES:
patent: 3727202 (1973-04-01), Fort
patent: 3967061 (1976-06-01), Dobias
patent: 3979746 (1976-09-01), Jarrett
patent: 4189784 (1980-02-01), Mendenhall
patent: 4468791 (1984-08-01), Masek

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