Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1990-10-09
1993-02-09
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
328 72, 307510, H03D 324
Patent
active
051857685
ABSTRACT:
A digital integrating clock extraction technique for communication systems and information and data processing systems having high jitter and/or noise is disclosed. The technique is based on the integration and periodic analysis of a plurality of sorted data edge transitions of a received serial data stream. A retiming clock phase is selected from a plurality of locally generated clock signals of different phase. The retiming clock selection is preferably reevaluated after N data edge transition sorts. The resultant data edge histogram can be cumulative of all sorted transitions or merely cumulative of the last N sorted transitions. Corresponding methods and apparatus are described.
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Ferraiolo Frank D.
Gersbach John E.
Novof Ilya I.
Chin Stephen
International Business Machines - Corporation
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