Pulse or digital communications – Repeaters – Testing
Patent
1979-11-09
1981-07-21
Heyman, John S.
Pulse or digital communications
Repeaters
Testing
328 61, 328155, 375119, 307269, H03K 526, H03L 700
Patent
active
042800994
ABSTRACT:
An improved method of recovering a clock reference signal from digital data and maintaining small phase errors between the two. The clock reference signal is phase matched with the digital data by comparing the positive going and negative going edges of the data with the clocking edge of the clock signal. A hard decision is made on the relative phase of the clock signal and the data only after several edge transitions occur. After a finite number of samples of these transitions, a decision is made whether to advance or retard the clock signal by observing whether the majority of the data transitions over the sample period occurred prior to or after the clocking edge of the clock signal. This allows a sampled mean to be established and thereby a more accurate prediction of the relative phase between the clock signal and data to be made. In addition, a fast acquisition technique is provided to insure the clock reference signal is received in a minimum amount of time.
REFERENCES:
patent: 3544717 (1970-12-01), Smith
patent: 3585298 (1971-06-01), Liberman
patent: 3593160 (1971-07-01), Moore
patent: 3671776 (1972-06-01), Houston
patent: 3745248 (1973-07-01), Gibson
patent: 3820030 (1974-06-01), Williams
patent: 3894246 (1975-07-01), Torgrim
patent: 4105979 (1978-08-01), Kage
patent: 4163946 (1979-08-01), Alberts
Heyman John S.
Sperry Corporation
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