Temperature-independent variable-current source
US4967139A · kind A · utility
5Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1990 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | Apr 16, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/907
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
This variable-current source comprises a differential stage and a pair of voltage buffers which respectively receive, at the input, a variable input voltage and a reference voltage and are connected at the output to the differential stage. Both buffers comprise a resistor flown by a current which varies only as a function of the respective input voltage and of its resistance and therefore depends thermally exclusively on this resistance, and provide output voltages which depend upon these currents, so that the output current generated by the differential stage is temperature-independent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.