The field-effect transistor which has with two output terminals which consist of the control mannered null gate terminal and the source terminal and the drain

摘要

PROBLEM TO BE SOLVED: To achieve a sensor which is capable of keeping a gate current ig stable and its stability high, even if a temperature change or a current variation occurs in an oscillating proximity sensor which is equipped with an oscillation circuit that is provided with field effect transistors as oscillation elements and detects an external change corresponding to a change, in a current which flows through a feedback path that feeds back a gate current to the gate terminal while a source terminal or a drain terminal is connected to the gate terminal.;SOLUTION: The oscillating sensor 1 is configured so as to be equipped with a voltage control unit 20 that keeps the DC component ig of the gate current which flows through a feedback path 8, at a prescribed value by changing a voltage applied between the source terminal S and the drain terminal D.;COPYRIGHT: (C)2007,JPO&INPIT