Comparator with a predetermined output state in dropout
US5648735A · kind A · utility
8Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1996 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Apr 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/007
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A comparator combines unbalanced differential input amplifiers to produce a balanced input stage that forces the comparator output to a predetermined state whenever the first differential amplifier enters dropout. The comparator's second differential amplifier is imbalanced to overcome the variable offset voltage which creates the comparator's hysteresis voltage. Its first differential amplifier is imbalanced to compensate for the imbalance of the second amplifier, thereby producing an input stage which is balanced overall and free of input offset voltages that would otherwise be present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.