| 摘要 |
PURPOSE:To facilitate separating a load circuit and a driving circuit from each other by connecting a capacitor, which has an electrostatic capacity sufficiently large than that between the gate and the source of a field effect transistor FET, at least between the source of the FET and the driving circuit. CONSTITUTION:A power source E and a load 12 are connected between the drain and the source of an active element, for example, a MOS field effect transistor (MOSFET) 11. The gate of the MOSFET 11 is connected to one output terminal of a driving circuit 14 through a capacitor 13, and the other output terminal of the driving circuit 14 is connected to the source of the MOSFET 11 through a capacitor 15. Both output terminals of the driving circuit 14 are connected by a stabilizing resistance 16. Electrostatic capacities of capacitors 13 and 15 are set to a value sufficiently larger than the electrostatic capacity between the gate and the source of the MOSFET 11. Thus, the driving circuit 14 and a load 12 are easily insulated from each other.
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