Common mode cancellation in differential networks
US7956688B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 2009 |
| Grant date | Jun 7, 2011 |
| Priority date | — |
| Expiry date | Dec 4, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0284
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.