Coded data generation or conversion – Digital code to digital code converters – To or from minimum d.c. level codes
Patent
1994-12-09
1997-02-25
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
To or from minimum d.c. level codes
341 95, H03M 700
Patent
active
056063172
ABSTRACT:
A method and apparatus for encoding and decoding m-bit groups of digital data, where m is at least eight, into serial n bit groups such that each encoded serial n-bit group has sufficient data transitions therein to maintain the synchronization of a phase locked loop clock recovery circuit in a high speed serial link of a communication path. Further, this method and apparatus provides a duty cycle that is within an operational range of the ideal 50 percent, which reduces voltage drift of a.c. coupled high speed serial data links, or reduces thermal drift of optically coupled high speed serial data links.
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J. Bellamy, Digital Telephony, Second Edition, (John Wiley & Sons, Inc., New York), pp 170-193.
J. Bellamy, Digital Telephony, Second Edition, (John Wiley & Sons, Inc., New York), pp. 392-399.
Cloonan Thomas J.
Novotny Robert A.
Olenz Randy M.
Richards Gaylord W.
Wojcik Michael J.
Hoff Marc S.
Lucent Technologies - Inc.
Penrod Jack R.
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