CMOS sub-bandgap reference with an operating supply voltage less than the bandgap
US6617836B1 · kind B1 · utility
11Cited by
2References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 8, 2002 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | May 8, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/901
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A circuit that outputs a stable reference voltage with an operating supply voltage less than the band gap potential and also less than a zero-bias threshold voltage. In one embodiment, the sub-band gap circuit includes an operational amplifier having an N-well input stage operating in the sub-threshold region, and a proportional to absolute temperature (PTA) current source having a forward-biased P-bulk. In another embodiment, the operational amplifier realizes sub-one volt operation by making use of back gating as the input stage, allowing full rail-to-rail input and output swings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.