Pressure detecting apparatus having linear output characteristic

摘要

A pressure detecting apparatus which comprises a bridge circuit with semiconductor pressure elements; a constant voltage circuit for applying voltage to the bridge circuit; an amplifier circuit for amplifying the output of the bridge circuit thereby to provide an electrical signal proportional to the pressure variation; and a voltage correcting circuit connected between the input of the amplifier circuit and the input of the bridge circuit for amplifying the output of the bridge circuit to feed it back to the bridge circuit, and in which the output of the voltage correcting circuit and the output of the constant voltage circuit are applied to the bridge circuit to improve the linearity of the response characteristic or the pressure-electrical signal output characteristic.