The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 13, 2004
Filed:
Sep. 25, 1998
Applicant:
Inventors:
Hayden Clay Cranford, Jr., Apex, NC (US);
Raymond Paul Rizzo, Raleigh, NC (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/06 ;
U.S. Cl.
CPC ...
H03L 7/06 ;
Abstract
A system that generates data waveforms for transmission on a communications network includes a series of sequentially over sampled and switch current sources whose timings are locked to a master delay line and replicas thereof. The master delay is configured as a ring oscillator with its frequency looked to a precise clock reference. The clock controls the rise and fall of the data waveforms thus making them immune to variations in semiconductor processes used to implement the system.