公开(公告)号：US5952878A

公开(公告)日：1999-09-14

申请号：US9786

申请日：1998-01-20

申请人： Chien-Ping Wu ,  Chang-Da Tsai ,  Shiao-Long Zhan

发明人： Chien-Ping Wu ,  Chang-Da Tsai ,  Shiao-Long Zhan

IPC分类号： H03H11/04 ,  H03H11/12 ,  H03K5/00 ,  H03B1/04

CPC分类号： H03H11/1217

摘要： A second-order differential highpass filter constructed according to the present invention includes a difference amplifier and a feedback processing circuit. The difference amplifier includes an operational amplifier OP.sub.1, and four resistors R.sub.3, R.sub.4, R.sub.5 and R.sub.6, wherein R.sub.4 /R.sub.3 =R.sub.6 /R.sub.5. An input voltage V.sub.1 is fed to the inverting terminal (-) of the operational amplifier OP.sub.1 via the resistor R.sub.5. Another input voltage V.sub.2 is fed to the noninverting terminal (+) of the operational amplifier OP.sub.1 via the resistor R.sub.3. The output of the operational amplifier OP.sub.1 is fed back to the inverting terminal (-) of the operational amplifier OP.sub.1 via the resistor R.sub.6. The feedback processing circuit includes an operational amplifier OP.sub.2, two resistors R.sub.1 and R.sub.2, and two serial capacitors C.sub.2 and C.sub.1. The output of the operational amplifier OP.sub.2 is fed back to the inverting terminal (-) of the operational amplifier OP.sub.2 via the two serial capacitors C.sub.1 and C.sub.2, and is connected to the noninverting terminal of the operational amplifier OP.sub.1 via the resistor R.sub.4, and the noninverting (+) terminal of the operational amplifier OP.sub.2 is grounded. The inverting terminal of the operational amplifier OP.sub.2 is connected to the output terminal of the operational amplifier OP.sub.1 via the resistor R.sub.1. The two serial capacitors C.sub.1 and C.sub.2 are connected therebetween to one terminal of the resistor R.sub.2 of which another terminal is grounded.

摘要翻译： 根据本发明构造的二阶差分高通滤波器包括差分放大器和反馈处理电路。 差分放大器包括运算放大器OP1和四个电阻器R3，R4，R5和R6，其中R4 / R3 = R6 / R5。 输入电压V1通过电阻R5馈送到运算放大器OP1的反相端（ - ）。 另一个输入电压V2通过电阻器R3馈送到运算放大器OP1的同相端（+）。 运算放大器OP1的输出经由电阻R6反馈到运算放大器OP1的反相端（ - ）。 反馈处理电路包括运算放大器OP2，两个电阻器R1和R2以及两个串联电容器C2和C1。 运算放大器OP2的输出经由两个串联电容器C1和C2反馈到运算放大器OP2的反相端（ - ），并且经由电阻器R4连接到运算放大器OP1的同相端子，并且 运算放大器OP2的同相（+）端子接地。 运算放大器OP2的反相端经由电阻R1与运算放大器OP1的输出端相连。 两个串联电容器C1和C2连接在另一个端子接地的电阻器R2的一个端子之间。