Method for generating a substantially temperature independent current and device allowing implementation of the same
US6459326B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 2001 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Jun 7, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/245
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and a device for generating a substantially temperature independent current (I1) are described. To generate this current (I1), a conventional current generator circuit including an operational amplifier (11) controlling a transistor (12) having one (12a) of its current electrodes (12a, 12b) connected to a resistor (13) and to an input terminal (11b) of the operational amplifier (11), is used. According to the invention, a temperature stable input voltage (Vin) is applied at the other input terminal (11a) of the operational amplifier (11), and the latter is arranged so that it has an offset voltage (Vos(T)) between its input terminals (11a, 11b) having a temperature dependence, this offset voltage (Vos(T)) and the input voltage (Vin) being adjusted to compensate for the temperature dependence of the resistor (13) such that the current generated (I1) is substantially temperature independent. According to the invention, the geometry of the differential pair of the operational amplifier (11) is acted upon to generate the offset voltage (Vos(T)).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.