Transmit based equalization using a voltage mode driver
US7227382B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 2005 |
| Grant date | Jun 5, 2007 |
| Priority date | — |
| Expiry date | May 26, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0278
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A driver circuit. In one embodiment, the driver circuit includes a plurality of pull-up circuits and a plurality of pull-down circuits. The driver circuit also includes control logic that is coupled to activate/deactivate the pull-up and pull-down circuits. The driver circuit may perform emphasized signal transmissions having a voltage swing of a first magnitude or de-emphasized signal transmissions having a voltage swing of a second magnitude, wherein the first magnitude is greater than the second magnitude. The control logic is further configured to activate and/or deactivate pull-up and/or pull-down circuits such that the driver circuit output impedance in the emphasized mode is substantially equal to the output impedance in the de-emphasized mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.