Bandgap reference circuit and method
US5900772A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1997 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Mar 18, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/267
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A bandgap reference circuit (60) provides a selectable bandgap reference voltage that is substantially insensitive to temperature variations of an operating reference circuit. A final curvature caused by a current (I.sub.2) in a temperature coefficient compensation transistor (40) is equal to a drift in a Vbe voltage of a transistor (18) having a negative temperature coefficient plus the drift in a Vbe voltage of a transistor (20) having a positive temperature coefficient minus the drift in a Vbe voltage of the temperature coefficient compensation transistor (40). The nonlinearity of the current (I.sub.2) in the temperature coefficient compensation transistor (40) is adjusted by selecting a compensating current and associated temperature coefficient for the compensating current (I.sub.0) to minimize the characteristic bow or curvature of the current (I.sub.2) in the temperature coefficient compensation transistor (40).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.