Apparatus and method for linear on-die termination in an open drain bus architecture system
US6424170B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2001 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | May 18, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0292
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A pull-up circuit has substantially linear current-voltage (I-V) characteristics for use in a bus system, such as in an open drain bus architecture type system. Operation in the linear region of the I-V characteristics is useful in high frequency input/output circuits. The pull-up circuit includes a transistor and a single termination resistor coupled to the transistor, and is simpler than other types of pull-up circuits. This simplicity in design saves area on a chip. The termination resistor in the pull-up circuit can be an n-well resistor formed on the same chip as the transistor, thereby further contributing to the savings in chip area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.