Programmable termination circuit and method
US6642740B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2001 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Sep 30, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/0005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A semiconductor device is provided which includes: a plurality of termination circuits having a plurality of impedance elements connected to an input/output pad, said termination circuits being controlled by impedance control signals; and a controller for outputting said impedance control signals to adaptively change with changes in characteristic impedance of a transmission line connected to the input/output pad in bi-directional data communication, to adaptively control the plurality of impedance elements in the plurality of input termination circuits for matching the impedance to the characteristic impedance of the transmission line. Each of the plurality of impedance elements is configured in pairs of MOS transistors. The plurality of termination circuits have different impedance values. And each of the impedance elements of the plurality of termination circuits is independently controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.