| 摘要 |
PURPOSE:To reduce the size of a passive element, by using a passive circuit providing a two-wire termination impedance in a feedback loop and keeping the value of capacitance or inductance of the passive circuit and the dielectric strength low, when the capacitance of inductance is included in the passive circuit. CONSTITUTION:A signal inutted to two-wire input lines 20, 21 is detected at a differential amplifier 12 and a differential signal is outputted to a terminal 22. The output is outputted to a four-wire output terminal 23 via a differential amplifier 14. Further, a signal applied to a four-wire input terminal 24 is inputted to a differential amplifier 13 and a current subjected to voltage-current conversion of an impedance Z1 of a passive circuit 17 connected to an emitter 26 is outputted. This output is amplified with respect to current 16 and a complementary output current is outputted to the two-wire input terminals 20 and 21. |
