Analog-to-digital converter and reference voltage circuitry
US5471131A · kind A · utility
22Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1994 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Aug 9, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/907
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The analog to digital converter 300 has voltage reference circuitry 326 which includes a bandgap generator and a correction circuit 5300. The bandgap generator includes first and second NPN transistors 5211-5224, 5231-5232 of differing emitter areas and an operational amplifier 5202 with inputs sensing the collector current of the first and second NPN transistors 5211-5224, 5231-5232. First and second NPN transistors 5211-5224, 5231-5232 have their bases tied together. The output of the amplifier 5202 drives the bases of the NPN transistors 5211-5224, 5231-5232 through a resistor divider 5251-5253.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.