Low supply voltage band-gap reference circuit and negative temperature coefficient current generation unit thereof and method for supplying band-gap reference current
US7495505B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2006 |
| Grant date | Feb 24, 2009 |
| Priority date | — |
| Expiry date | Oct 9, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/30
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A low supply voltage band-gap reference circuit is provided, which includes a positive temperature coefficient current generation unit and a negative temperature coefficient current generation unit, and it is implemented by way of current summing. Through the current-mode temperature compensation technique, the present invention is able to reduce the voltage headroom and the number of operational amplifiers required by the conventional voltage-summing method, as well as the influence to the output voltage due to the offset voltage, thereby providing a stable and low voltage band-gap reference voltage level. In addition, by reducing the number of operational amplifiers and resistors of high resistance, the circuit area is reduced, and chip cost is saved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.