| 摘要 |
PURPOSE:To provide a blind sector with respect to pressure to be detected by arranging a blind sector circuit at the rear stage where the output of a semiconductor strain gauge G is amplified linearly. CONSTITUTION:A blind sector circuit comprising partial pressure resistances R1-R4, diodes D1 and D2 and a differential amplifier A2 is provided at the rear stage where the output of a semiconductor strain gauge G is amplified linearly. This maintains the output E0 of the differential amplifier A2 at a constant value (e) when the input side voltage rhereof is between e - VF and e + VF (where, VF represents forward drop voltage of the diodes D1 an D2) and presents the effect of a blind sector having no relation with the amplification output corresponding to the pressure to be detected of the semiconductor strain gauge G. |
