公开(公告)号：EP2688204A1

公开(公告)日：2014-01-22

申请号：EP11875909.1

申请日：2011-11-14

申请人： Fuji Electric Co., Ltd.

发明人： SUZUKI, Takeshi ,  MATSUO, Naoyuki ,  KISHIRO, Masami

IPC分类号： H03F3/70 ,  H03F3/45 ,  H03G3/10

CPC分类号： H03G1/0023 ,  G01D5/24 ,  G01L9/08 ,  G01L9/12 ,  G01P15/125 ,  G01R27/025 ,  G01R29/24 ,  G01R31/2829 ,  H03F3/45183 ,  H03F3/45286 ,  H03F3/45475 ,  H03F3/70 ,  H03F2203/45521 ,  H03F2203/45526

摘要： Provided is an electric charge detection circuit that enables easily performing gain adjustment on the input side of a differential amplifier circuit. Ends on one side of physical quantity detection sensors 21, 22 formed of any of an electric charge generation-type sensor and a capacitance change-type sensor are connected to negative electrode input terminals of a differential amplifier circuit 1, and ends on the other side are connected to positive electrode input terminals of the differential amplifier circuit 1. A feedback resistor Rf and a feedback capacitor Cf are connected in parallel between the negative electrode input terminal and an output terminal of the differential amplifier circuit 1, and a cancel resistor Rc and a cancel capacitor Cc are connected in parallel between a reference voltage and the positive electrode input terminal of the differential amplifier circuit 1. Drain voltage adjustment circuits 12, 13 are provided that adjust the drain voltage of at least one of two field effect transistors FET 1, FET 2 to which positive and negative differential inputs of the differential amplifier circuit 1 are individually inputted. Gain adjustment of at least one of the positive and negative differential inputs is thus enabled.

摘要翻译： 提供了一种电荷检测电路，其能够容易地在差分放大器电路的输入侧执行增益调整。 由电荷产生型传感器和电容变化型传感器中的任何一个形成的物理量检测传感器21,22的一侧连接到差分放大器电路1的负极输入端，并且在另一侧 连接到差分放大器电路1的正极输入端子。反馈电阻器Rf和反馈电容器Cf并联连接在负极输入端子和差分放大器电路1的输出端子之间，并且消除电阻器Rc和 取消电容器Cc并联连接在基准电压和差分放大器电路1的正极输入端子之间。设置漏极电压调节电路12,13，调节两个场效应晶体管FET1至少一个的漏极电压 ，差分放大器电路1的正和负差分输入单独进入的FET 2 推杆。 因此可以使正负差分输入中的至少一个的增益调整。