Low power digital signal isolator

Details Low power digital signal isolator Low power digital signal isolator

H - Electricity

03

K

H03K 19/0175 (2006.01) H04B 10/00 (2006.01)

Patent

CA 2230749

A signal isolating device for an input digital signal has a first photo-coupler which is activated by the differential pulse produced at the leading edge of the digital signal and a second photo-coupler which is activated by the differential pulse produced at the trailing edge of the digital signal. A positive feedback system is connected in push-pull fashion with the photo-couplers for producing an output digital signal that corresponds to the input digital signal. The positive feedback system may be implemented by a buffer that includes a resistor for keeping the buffer in a stable state even when both of the photo-couplers are non-conductive.

Dispositif d'isolation d'un signal numérique d'entrée. Comprend un premier photocoupleur activé par l'impulsion différentielle produite sur le front avant du signal numérique et un deuxième photocoupleur activé par l'impulsion différentielle produite sur le flanc arrière du signal numérique. Un système à réaction positive est connecté en mode push-pull aux photocoupleurs afin de produire un signal numérique de sortie correspondant au signal numérique d'entrée. Le système à réaction positive peut être réalisé au moyen d'un circuit tampon comprenant une résistance pour maintenir ledit circuit tampon dans un état stable même lorsque les deux photocoupleurs sont non conducteurs.

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