Electric reference voltage generating device of improved accuracy and corresponding electronic integrated circuit
US7218167B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2005 |
| Grant date | May 15, 2007 |
| Priority date | — |
| Expiry date | Jun 22, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/30
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention relates to a device for generation of a reference electrical voltage. The device includes a first current generator outputting a current proportional to temperature. The first current generator comprises at least one operational amplifier and two branches in parallel, a first branch comprising a first current source and a first bipolar transistor, and a second branch comprising a second current source, a first resistance and a second bipolar transistor. A second current generator outputs a current conversely proportional to temperature. The device includes means of summating the currents so as to obtain a voltage independent of the said temperature, and means of reducing dependence of the current circulating in the said first branch on the value of the said first resistance. The reduction means comprises at least one second resistance with a non-adjustable value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.