Output driver having output current compensation and method of compensating output current
US6556049B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2001 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Mar 14, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/00361
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An output driver supplying constant output current regardless of output voltage changes. The output driver includes a current source for regulating changes in a voltage of an output terminal responsive to a reference signal, and an output current compensator that responds to the current source to supply constant current to the terminal. The current source includes a first MOS transistor having a drain coupled to the terminal and a gate to which the reference signal is input, and a second MOS transistor having a drain coupled to a source of the first MOS transistor, a gate to which data is input, and a source coupled to ground. The current source may be an open drain current source. The output current compensator includes a current compensator coupled to the terminal, and a sensing driver for sensing voltage changes of the terminal and driving the current compensator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.