Apparatus and method for timing recovery from a...

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H - Electricity

03

K

328/166

H03K 9/04 (2006.01) G11B 20/14 (2006.01) H04L 7/027 (2006.01)

Patent

CA 1101082

D-20015 APPARATUS AND METHOD FOR TIMING RECOVERY FROM A PSEUDO- TERNARY SIGNAL by Jay A. Thomas ABSTRACT OF THE DISCLOSURE A circuit for obtaining clock timing information from an equalized pseudo-ternary signal, such as is exemplified by a signal using the modified duobinary code, includes a level selector in which the signal is sliced at a predetermined amplitude. A slicing level reference circuit provides the threshold voltage for the level selector so that only the upper level portion of the original is obtained for processing. This upper level portion is applied to an amplifier and then to a frequency selection circuit which is tuned to the clock frequency of the original signal.

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