| 摘要 |
PURPOSE:To realize a long-distance transmission of signal, by eliminating the effect of the electrostatic capacitance caused between a driving line and a reference line and the effect of common impedance. CONSTITUTION:A capacitor 17 having sufficiently larger value than interline electrostatic capacitance is connected between a reference line 3 and a common 9 at a termination part 1. At the same time, current transformers 18a-18c and capacitors 19a-19c are provided to interface means 11a-11c. Then a reverse current is produced by the currents flowing through transmitting means 12a-12c and via the transformer a 18a-18c. This reverse current is flowed to the side of the line 3 to prevent the fluctuation of potential for the line 3. At the same time, the current flowing through the common impedance is offset by the reverse current. Thus the fluctuation is avoided for the common potential. |
