SIGNAL TRANSMISSION DEVICE

摘要

A signal transmission device includes a transmitting circuit 11 and a receiving circuit 12 provided with shunt regulator power supplies 110 and 120 for causing fixed currents to flow thereinto respectively, and a signal transmission path 13 connecting between the transmitting circuit 11 and the receiving circuit 12 and having a function of preventing an alternating current component, in which a ground GNDA of the transmitting circuit 11 and a ground GNDB of the receiving circuit 12 are disposed independently of each other, and are connected to a ground GNDC of the shunt regulator power supplies 110 and 120 at a single point.