| 摘要 |
PURPOSE:To avoid an unmatched impedance state by providing a means for detecting an unmatched impedance state between connected circuits and connecting an impedance matching element for termination to the output of a circuit to be connected by the output of said detecting means. CONSTITUTION:While signals are transmitted from own circuit 4 to a circuit 5 of the other side, an impedance matching state with the circuit 5 is detected by an impedance detecting circuit 6. This detection output is supplied to a control circuit 7, and the circuit 7 actuates a terminating circuit 8 with an input signal. Thus the output signal of the circuit 4 is terminated by an impedance matching element and at the same time the signal is cut off also to the circuit 5. The impedance matching element is also connected to the signal cut-off position at the side of the circuit 5. Thus the effect due to an unmatched impedance state can be reduced. |
