CMOS controlled-impedance transmission line driver
US6909310B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2003 |
| Grant date | Jun 21, 2005 |
| Priority date | — |
| Expiry date | Jan 30, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/04106
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A line driver fabricated from CMOS devices that provides a substantially constant output impedance over a significant range of a time-varying input voltage includes a time-varying current source, a pair of CMOS output loads, and a pair of biasing circuits. Each CMOS output load includes a NMOS transistor and a PMOS transistor connected in parallel and each biased into a linear range of operation. In response to a time-varying input voltage, the time-varying current source draws current from the pair of CMOS output loads in a manner that operates each CMOS output load to collectively establish a time-varying output voltage component at an associated output terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.