公开(公告)号：US4800759A

公开(公告)日：1989-01-31

申请号：US91219

申请日：1987-08-31

申请人： Terutaka Hirata ,  Tetsu Odohira ,  Tadashi Nishikawa

发明人： Terutaka Hirata ,  Tetsu Odohira ,  Tadashi Nishikawa

IPC分类号： G01L9/06 ,  G01L7/08 ,  G01L19/04

CPC分类号： G01L9/065

摘要： A semiconductor pressure converter wherein a drive voltage is applied to a power supply end of a shearing type gage formed at the strain generating part of a semiconductor diaphragm, and an output voltage appearing at the output end thereof is amplified with an amplifier. The zero point is adjusted by applying a bias voltage to the amplifier which is related to the drive voltage. The span is adjusted without interference to the zero point by changing the feedback voltage of the amplifier. Linear compensation, temperature zero point compensation and temperature span compensation are attained without any mutual interference.

摘要翻译： 一种半导体压力转换器，其中驱动电压被施加到形成在半导体膜片的应变发生部分的剪切型计量器的电源端，并且其输出端出现的输出电压用放大器放大。 通过将偏置电压施加到与驱动电压相关的放大器来调整零点。 通过改变放大器的反馈电压来调节量程而不影响零点。 实现线性补偿，温度零点补偿和温度范围补偿，没有任何相互干扰。

公开(公告)号：US4644798A

公开(公告)日：1987-02-24

申请号：US770664

申请日：1985-08-28

申请人： Hisashi Tamura ,  Terutaka Hirata ,  Tetsu Odohira ,  Tadahiro Ogawa

发明人： Hisashi Tamura ,  Terutaka Hirata ,  Tetsu Odohira ,  Tadahiro Ogawa

IPC分类号： G01D5/24 ,  G01L9/00 ,  G01L9/12 ,  G01L7/08 ,  C08C19/10 ,  G01L19/04

CPC分类号： G01L9/0075 ,  G01L9/125

摘要： A capacitive type converter device, such as used for measuring pressure, comprising first and second rectifying circuits, each including an operational amplifier with a non-inverting input terminal connected to a reference point, to which a variable condenser is connected, the variable condenser having a capacitance which varies in response to a force being measured, such as pressure, and to which a reference condenser is connected, the reference condenser having a capacitance which is fixed independent of the force being measured. The device further comprises an oscillator, whose oscillation output is applied to the variable and reference condensers,and which is controlled by a control means in response to output of the first rectifying circuit, or in response to the output of the second rectifying circuit together with the output of the first rectifying circuit, whereby an output responsive to the capacitance of the variable condenser is obtained from the output of the second rectifying circuit, or an output relating to the difference between the capacitances of the condensers is obtained from the outputs of the first and second rectifying circuits. The device eliminates adverse influences of stray capacitances, non-linearity, offset signals, and parallel capacitances and forward voltages.

摘要翻译： 一种诸如用于测量压力的电容型转换器装置，包括第一和第二整流电路，每个包括具有连接到可变电容器的参考点的非反相输入端的运算放大器，可变冷凝器具有 响应于被测量的力例如压力而变化的电容，参考电容器连接到其上，参考电容器具有独立于被测量的力而固定的电容。 该装置还包括振荡器，其振荡输出被施加到可变和参考电容器，并且响应于第一整流电路的输出而由控制装置控制，或者响应于第二整流电路的输出连同 第一整流电路的输出，从第二整流电路的输出获得响应于可变电容器的电容的输出，或者从电容器的电容之间的差异获得与电容器的电容之间的差异的输出 第一和第二整流电路。 该器件消除杂散电容，非线性，偏移信号，并联电容和正向电压的不利影响。