Output buffer with constant switching current
US6624672B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2001 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Dec 21, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/00361
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The buffer has an output stage formed by two complementary MOS transistors connected so as to operate in phase opposition between the supply terminals and two driver stages having the input in common. Each driver stage has a first branch comprising a current-generator connected between the gate electrode of the transistor to be driven and a supply terminal and an electronic switch controlled by the input and connected between the same gate electrode and the other supply terminal, and a second branch which comprises, connected in series, a transistor connected as a diode and an electronic switch controlled by the output, and is arranged between the gate electrode of the transistor to be driven and a respective supply terminal. The buffer can control a load with a constant switching current, is simple in structure, and occupies a small area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.