Integrated circuit for generating a temperature independent, dynamically compressed voltage function of the value of an external regulation resistance
US5081708A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1990 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Mar 13, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A temperature independent, dynamically compressed, DC control voltage is obtained by converting by means of a converter circuit employing a current mirror, a linear variation of the voltage across a control potentiometer, external to the integrated circuit, in a logarithmic differential voltage between two output voltage terminals, respectively on a first and a second branch of the converter circuit, the voltage signal taken from the first branch of the converter circuit being fed to the input of a unitary gain stage biased by a current generator with a temperature coefficient corresponding to the reciprocal of the temperature coefficient of integrated resistances and the corresponding output signal of the unitary gain stage being fed to a first input of a differential stage, to the second input of which is fed the signal taken from the second branch of the converter circuit. The differential stage being also biased by a current generator with a temperature coefficient equal to the reciprocal of the temperature coefficient of integrated resistances and having an integrated load resistance connected between the supply rail and the output terminal of the differential stage on which t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.