Multi stage circuits for providing a bandgap voltage reference less dependent on or independent of a resistor ratio
US6614209B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2002 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Apr 29, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/30
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A bandgap voltage reference uses multiple PTAT voltage reference circuits (also called PTAT sources) coupled in series to generate a final PTAT voltage. A current-biased base-emitter region of a bipolar transistor is coupled between the final PTAT voltage and an output terminal of the bandgap voltage reference so as to add the base-emitter voltage to the final PTAT voltage to thereby generate a stable bandgap voltage reference. By using multiple PTAT voltage reference in series, the need for a resistor ratio is reduced (or even eliminated) thereby reducing the size of the resistors that generate the resistor ratio (or eliminate the need for the resistors entirely).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.