| 摘要 |
PURPOSE:To connect many systems to a bus line by connecting a resistor and an inductance in series with a bus line so as to ensure a high impedance to a high frequency signal. CONSTITUTION:The resistor R and the inductance L are connected in series with the bus line 1 and they are selected to have a relation expressed in equation I with respect to a characteristic impedance Zc of the bus line 1 and parallel conductance G and prallel capacitive component C of an isolation transformer 4. The resistor R, the inductance L and the isolation transformer 4 are accommodated inn one case to form the coupling part. The impedance depending on the resistor R, inductance L in the coupling part and the G and C in the isolation transformer 4 is equal to the characteristic impedance Zc of the bus line 1 expressed in a prescribed equivalent circuit. Thus, impedance mismatching at any point of the bus line 1 is avoided independently of the presence of the connection of a transceiver part and the transmission without disturbance in the signal waveform is attained.
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