Feedback circuit for line load compensation and reflection...

H - Electricity – 03 – K

Patent

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H03K 17/16 (2006.01)

Patent

CA 2635600

Line load compensation and reflection reduction in a signal transmitting circuit is provided using feedback capacitors. The feedback capacitor serially coupled with a resistance generates an RC rise/fall time that is independent of the line load. Additionally, by selecting a capacitor that yields a rise/fall time of approximately 1/3 of the maximum bit transmission time, signal reflection on the signal line can be reduced. Accordingly, by incorporating the feedback capacitor with a differential drive circuit, such as the IB 485 driver, variations in line load can be compensated for while also reducing signal reflection due to un-terminated or improperly terminated signal lines, thus allowing a free topology implementation.

Selon l'invention, une compensation de charge de ligne et une réduction de réflexion sont réalisée dans un circuit de transmission de signal, au moyen de condensateurs de contre-réaction. Le condensateur de contre-réaction couplé en série avec une résistance, génère un temps de montée/descente RC qui ne dépend pas de la charge de ligne. En outre, la sélection d'un condensateur qui permet d'obtenir une temps de montée/descente d'environ 1/3 du temps de transmission binaire maximal, permet de réduire la réflexion de signal sur la ligne de signal. En conséquence, l'intégration d'un condensateur de contre-réaction dans un circuit pilote différentiel tel qu'un pilote IB 485 driver, permet de compenser les variations de charge de ligne, tout en limitant la réflexion de signal due à des lignes de signal non terminées ou mal terminées, ce qui permet une implémentation à topologie libre.

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