Bandgap voltage reference using differential pairs to perform temperature curvature compensation
US6642699B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2002 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Apr 29, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/907
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A bandgap reference that generates a temperature stable DC voltage by using a corrective current. The corrective current is generated by a series of differential pairs that are controlled by both positive temperature shift gate voltage on one transistor, as well as a negative temperature shift gate voltage on the other transistor. As temperature changes and crosses the crossing point at which the current is split evenly through both transistors, the current change is more abrupt. The crossing points of each of the differential pairs may be appropriately selected so as to generate a high resolution corrective current. The various current contributions are summed to form the total corrective current, which tends to be quite accurate due to the abrupt crossing points. The corrective current is then fed back into the circuit so as to compensate for much of the temperature error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.