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    • 8. 发明授权
    • Current-to-voltage converter with highpass filter function
    • 具有高通滤波器功能的电流 - 电压转换器
    • US5952885A
    • 1999-09-14
    • US964728
    • 1997-11-05
    • Chien-Ping WuChang-Da TsaiJiann-Jong Chen
    • Chien-Ping WuChang-Da TsaiJiann-Jong Chen
    • H03F3/08H03H11/12H03F1/34
    • H03H11/1217H03F3/087
    • A current-to-voltage converter with highpass filter function constructed according to the present invention contains two operational amplifiers OP1 and OP2, two resistors R.sub.1 and R.sub.2, and a capacitor C.sub.1. The noninverting (+) terminal of the operational amplifier OP1 is grounded. The inverting (-) terminal of the operational amplifier OP1 is used to receive the output of the current-type sensing device and connected to the output terminal of the operational amplifier OP2 via the resistor R.sub.2. The output terminal of the operational amplifier OP1 is connected to the noninverting terminal of the operational amplifier OP2. The output of the operational amplifier OP2 is fed back to the inverting terminal of the operational amplifier OP2 via the capacitor C.sub.1, and the inverting terminal of the operational amplifier OP2 is connected to one terminal of the resistor R.sub.1 of which another terminal is grounded.
    • 根据本发明构造的具有高通滤波器功能的电流 - 电压转换器包含两个运算放大器OP1和OP2,两个电阻器R1和R2以及电容器C1。 运算放大器OP1的同相(+)端子接地。 运算放大器OP1的反相( - )端子用于接收电流型感测装置的输出,并通过电阻R2连接到运算放大器OP2的输出端。 运算放大器OP1的输出端连接到运算放大器OP2的同相端子。 运算放大器OP2的输出经由电容器C1反馈到运算放大器OP2的反相端,运算放大器OP2的反相端连接到另一端子接地的电阻器R1的一端。
    • 9. 发明授权
    • Second order differential highpass filter
    • 二阶差分高通滤波器
    • US5952878A
    • 1999-09-14
    • US9786
    • 1998-01-20
    • Chien-Ping WuChang-Da TsaiShiao-Long Zhan
    • Chien-Ping WuChang-Da TsaiShiao-Long Zhan
    • H03H11/04H03H11/12H03K5/00H03B1/04
    • H03H11/1217
    • 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.
    • 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。
    • 10. 发明授权
    • Second-order highpass difference filter
    • 二阶高通差分滤波器
    • US5701100A
    • 1997-12-23
    • US709867
    • 1996-09-10
    • Chien-Ping WuChang-Da Tsai
    • Chien-Ping WuChang-Da Tsai
    • H03H11/12H03K5/00H03B1/04
    • H03H11/126
    • A second-order highpass difference 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.1, R.sub.2, R.sub.3 and R.sub.4. The feedback processing circuit is composed of two operational amplifiers OP.sub.2 and OP.sub.3, resistors R.sub.5 and R.sub.6, and two serial capacitors C.sub.1 and C.sub.2. The inverting and noninverting terminals of the operational amplifier OP.sub.3 are connected to the output of the difference amplifier and of the operational amplifier OP.sub.2, respectively. The output of the operational amplifier OP.sub.2 is also fed back to the inverting terminal of the operational amplifier OP.sub.2 via the resistor R.sub.5, and the noninverting terminal of the operational amplifier OP.sub.2 is grounded. The output terminal of the operational amplifier OP.sub.3 is connected to the inverting terminal of the operational amplifier OP.sub.2 via the two serial capacitors C.sub.1 and C.sub.2 and to the noninverting terminal of the operational amplifier OP.sub.1 via the resistor R.sub.4. The two serial capacitors C.sub.1 and C.sub.2 are connected therebetween to one terminal of the resistor R.sub.6 of which another terminal is grounded.
    • 根据本发明构造的二阶高通差分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R1,R2,R3和R4。 反馈处理电路由两个运算放大器OP2和OP3,电阻器R5和R6以及两个串联电容器C1和C2组成。 运算放大器OP3的反相和非反相端分别连接到差分放大器和运算放大器OP2的输出端。 运算放大器OP2的输出也通过电阻R5反馈到运算放大器OP2的反相端,运算放大器OP2的同相端接地。 运算放大器OP3的输出端子通过两个串联电容器C1和C2连接到运算放大器OP2的反相端,经由电阻器R4连接到运算放大器OP1的同相端子。 两个串联电容器C1和C2连接在两个串联电容器C1和C2之间的另一个端子接地的电阻器R6的一个端子。