Integrated circuit arrangement with an open-collector transistor designed as npn transistor
US5973513A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | May 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D84/645
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In an integrated circuit arrangement with an open-collector transistor of the npn type, the collector of the open-collector transistor is connected through a collector resistor with preferably low ohmic resistance to an open-collector output of the circuit arrangement to which an output voltage is applied, and, through a parasitic diode which is switched in the reverse direction when the output voltage has a positive value, to a ground terminal of the circuit arrangement. The emitter of the open-collector transistor is connected to the ground terminal of the circuit arrangement and the base of the open-collector transistor is connected to a base current source that generates a base current. The open-collector transistor is switched to an inverse conducting state by the base current when the voltage value of the output voltage is below a negative threshold voltage value, in which state a voltage drop occurs across the collector resistor that is so great that the parasitic diode remains switched in the reverse direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.