FILTER CIRCUIT FOR DIFFERENTIAL COMMUNICATION

摘要

PROBLEM TO BE SOLVED: To provide a filter circuit that simplifies a circuit constitution of differential communication lines and effectively removes a common-mode noise and a normal-mode noise.

SOLUTION: In a filter circuit 3, a coil 30 is connected to a first communication line 12 and a coil 31 is connected to a second communication line 14; and capacitors 32 and 33 are connected in series on secondary sides of the coil 30 and coil 31, and capacitors 34 and 35 are connected on primary sides. Grounding is achieved between the capacitors 32 and 33 and between the capacitors 34 and 35. The coils 30 and 31 are arranged adjacently to each other with the polarities made opposite. The filter circuit 30 is used to serve as a π type filter for both a common-mode noise and a normal-mode noise for effectively removing these noises. A noise generated by the coils 30 and 31 is effectively prevented from being generated by arranging them adjacently to each other.

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