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:
Jun. 07, 2011
Filed:
Oct. 07, 2009
Rubina F. Ahmed, Cary, NC (US);
Bradley D. Herrman, Cary, NC (US);
Pravin Patel, Cary, NC (US);
Peter R. Seidel, Cary, NC (US);
Rubina F. Ahmed, Cary, NC (US);
Bradley D. Herrman, Cary, NC (US);
Pravin Patel, Cary, NC (US);
Peter R. Seidel, Cary, NC (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Embodiments of the invention include a common mode cancellation circuit and method for correcting signal skew in a differential circuit. According to one embodiment, an op amp circuit is used to correct the mismatch between transmission line lengths in the differential circuit. The CMCC can be embodied as an ASIC and added on to an existing differential signaling systems to correct and compensate for board wiring skew or other causes of phase misalignment. The result is restoration of the cross-over intersection of the plus and minus signals of the differential pair closer to the common voltage level point, as if the signals had been in phase.