Zener referenced threshold detector with hysteresis
US4525638A · kind A · utility
8Cited by
3References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1984 |
| Grant date | Jun 25, 1985 |
| Priority date | — |
| Expiry date | Jan 16, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/30
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a zener referenced voltage threshold detector, the voltage at which a switching transistor turns on is determined by the breakdown voltage of a zener diode coupled between ground and the base of the switching transistor in conjunction with the base-emitter voltage of the switching transistor itself. In order to render the threshold detector circuit immune from noise at the trip point, a portion of the switching transistor's collector current is supplied to a second transistor which when turned on reduces the voltage at the base of the switching transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.