Method and apparatus for multi-mode driver
US7183805B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2006 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Mar 20, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Multi-mode signal drivers with a single output circuit that may be controlled using a mode select input and that may include a common mode (CM) voltage compensation mechanism are described. In a first exemplary implementation, a multi-mode output driver is adapted to drive signals from a single output circuit according to at least two modes, such as a current mode logic (CML) signaling mode and a low voltage differential signaling (LVDS) mode. In a second exemplary implementation, a circuit comprises a quasi-LVDS output driver in which a differential amplifier circuit is connected in series with an adjustable resistive element and a programmable current source. In a third exemplary implementation, a CM voltage of an output driver circuit changes with changes to a programmable bias current. To compensate, a feedback mechanism provides a compensation signal to a variable resistive element of the output driver circuit to maintain a desired CM voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.