A method and an arrangement for adapting, from a dc point of...

H - Electricity – 04 – B

Patent

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Details

H04B 3/02 (2006.01) H03K 5/003 (2006.01)

Patent

CA 2271112

In a method and an arrangement for adapting, from a DC point of view, the signal input (4) of a first circuit (3), lying at a first DC voltage, to the signal output (2) of at least one second circuit (1), lying at a second DC voltage, the signal input terminal (4) is connected to the respective signal output terminal (2) of the respective second circuit (1) via a respective first resistance (R1), whereby first DC currents (IR1) will be allowed to flow through the respective first resistance (R1). The signal input (4) is adapted to be virtually short-circuited to a source for the first DC voltage (U), which is of a predetermined value, separate from zero. The first circuit (3) is adapted to internally generate a DC cancellation current (I) and bring it to flow in the signal input (4). The signal input (4) is to be connected to ground via a selectable, second resistance (R2), whereby a second DC current (IR2) will flow through the second resistance (R2). This second resistance (R2) is to be selected in such a manner that the sum of the DC cancellation current (I), the first DC currents (IR1), and the second DC current (IR2), equals zero.

Cette invention concerne un procédé et un système permettant d'adapter, en ce qui concerne le CC, l'entrée de signal (4) d'un premier circuit (3) se trouvant à une première tension en CC, à la sortie de signal (2) d'un ou de plusieurs seconds circuits (1) se trouvant à une seconde tension en CC. La borne d'entrée de signal (4) est connectée par l'intermédiaire d'une première résistance (R1) à la borne de sortie de signal (2) du second circuit (1), les premiers courants CC (IR1) pouvant passer à travers ladite première résistance (R1). L'entrée de signal (4) est conçue de manière à être mise virtuellement en court-circuit avec la source d'une première tension en CC (U) qui possède une valeur prédéterminée autre que zéro. Le premier circuit (3) va générer à un niveau interne un courant d'annulation CC (I) et le faire passer dans l'entrée de signal (4). Cette entrée de signal (4) est connectée à la terre par l'intermédiaire d'une seconde résistance (R2) sélectionnée à travers laquelle passe un second courant CC (IR2). Cette seconde résistance (R2) est choisie de manière à ce que la somme du courant d'annulation CC (I), des premiers courants CC (IR1) et du second courant CC (IR2) soit égale à zéro.

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