Low standby current comparator having a zero temperature coefficient with hysterisis
US5077491A · kind A · utility
38Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1990 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Nov 30, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/30
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A comparator circuit is provided compatible with CMOS logic levels for the input signal and including a substantially zero standby current when the input signal is initially less than the upper trip threshold. The trip threshold follows a bandgap voltage with a zero temperature coefficient, while hysterisis is provided with the upper and lower trip thresholds. An alternate embodiment of the comparator circuit provides a selectable zero temperature coefficient for the trip threshold as a ratio of emitter resistors while maintaining the hysterisis with the upper and lower trip thresholds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.