A method and device for temperature dependent current...

H - Electricity – 02 – M

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H02M 1/00 (2007.10) G05F 3/02 (2006.01) G05F 3/26 (2006.01)

Patent

CA 2253508

Most temperature related reference generations are in the voltage domain, which means that reference voltages rather than reference currents are generated. In some applications such as driving laser diodes, currents are needed rather than voltages. In the present invention, as an alternative, the references are designed in the current domain, wherein the operation philosophy can be said to be inverse to the operation philosophy of the prior art. The temperature dependence of the currents are known and the currents (1, 2) will be processed by linear and/or non linear operation to generate currents (3) with predetermined temperature coefficients. The advantages of the invention can be outlined as more straightforward, scaling and summation (subtraction) are much easier and simpler in the current domain than in the voltage domain.

Concernant la génération thermodépendante de courants de référence, on s'intéresse la plupart du temps à la génération de tensions de référence plutôt qu'à la génération d'intensités de référence. Dans certaines applications telles que les diodes de commande des lasers, ce sont des intensités dont on a besoin plutôt que des tensions. La présente invention vise ainsi à remplacer les références en tension par des références en intensité. On peut ainsi considérer que la logique de mise en oeuvre est l'inverse de celle utilisée selon l'état antérieur de la technique. La thermodépendance des intensités étant connue, le procédé consiste à traiter les intensités (1, 2) selon un processus linéaire et/ou non linéaire de façon à générer des intensités (3) caractérisées par des compensations de température définies. L'avantage de l'invention est directement que le produit scalaire et l'addition (ou la soustraction) sont plus faciles et plus simples dans le domaine des intensités que dans celui des tensions.

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