Circuit for setting the operating point of an...

H - Electricity – 04 – B

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H04B 10/06 (2006.01) B60S 1/08 (2006.01) H04B 10/158 (2006.01)

Patent

CA 2198002

A circuit is used to set the operating point of at least one opto-electronic component, e.g. a photodiode (10'), in which the opto-electronic component is part of a receiver for useful alternating light signals. In order to set the operating point below the saturation voltage of the opto-electronic component, a resistance circuit is connected in parallel with the opto-electronic component at least to compensate for direct light signals. The resistance circuit has a self-adjusting resistor, the resistance variation of which is at least voltage-dependent as soon as a given voltage below the saturation voltage is exceeded and thus loads the opto-electronic component until the set voltage is substantially attained. The compensation current required owing to the direct light is produced without an outside voltage in such a way that virtually no current need be taken from the power supply.

L'invention concerne un circuit servant à ajuster le point de fonctionnement dynamique d'au moins un élément optoélectronique, tel qu'une photodiode (10'), ledit élément optoélectronique constituant une partie d'un récepteur de signaux utiles de lumière alternante. Afin d'ajuster le point de fonctionnement dynamique en dessous de la tension de saturation de l'élément optoélectronique, un circuit de résistance est relié en parallèle à l'élément optoélectronique, au moins pour compenser les signaux de lumière constante. Le circuit de résistance comporte une résistance autorégulée qui modifie sa résistivité en fonction de la tension dès qu'une tension déterminée inférieure à la tension de saturation est dépassée, et charge par conséquent l'élément optoélectronique, jusqu'à ce que la tension voulue soit sensiblement atteinte. Le courant de compensation requis en raison du courant de lumière constante est produit sans tension d'origine indépendante, de manière qu'il ne soit pratiquement pas nécessaire de prélever de courant sur le bloc d'alimentation.

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