| 摘要 |
<p>PURPOSE:To remove the same phase components (induction noise) by miniaturizing the constitution with a mirror circuit and constituting so that the different impedance can be obtained by a differential signal and the same phase signal. CONSTITUTION:A feeding circuit is constituted three mirror circuits B0-B2 to supply the electric current from the earth side to a B line and three mirror circuits A0-A2 to pull in the electric current from an A line to a battery side. When a usual differential signal (call signal) is inputted, A capacitor CAB bypasses the differential signal, and the input to the third mirror circuits B2 and A2 is prohibited. For such a reason, to the differential signal, the first mirror circuits B0 and A0 supplies the electric current unrelatedly, and therefore, the impedance comes to be high impedance. On the hand, since to the same phase signal (induction noise), the action is executed as well as the circuit without the capacitor CAB, the alternating current component flows at the third and forst mirror circuits and the impedance comes to be the low impedance.</p> |
