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2. 发明授权

US08436679B1 Low frequency notch filter integrated circuit 有权
标题翻译：低频陷波滤波器集成电路
公开(公告)号：US08436679B1
公开(公告)日：2013-05-07
申请号：US13372307
申请日：2012-02-13
申请人： Hussain Alzaher , Noman Ali Tasadduq
发明人： Hussain Alzaher , Noman Ali Tasadduq
IPC分类号： H03B1/00
CPC分类号： H03H11/1256 , H03H2011/0488
摘要： The low frequency notch filter integrated circuit is implemented in a relatively small silicon area and with high linearity, thereby promoting the utilization of very large-scale integration (VLSI) techniques in biomedical instrumentation. The filter circuit utilizes R-2R ladders providing area saving of approximately 120:1. R-2R ladders function as digitally programmable resistors in a biquad configured Operational Amplifier filter circuit. Integrator loop topologies are used in the filter circuit. The preferred topology utilizes a Tow-Thomas circuit, which can be designed for the prerequisite gain and Q independently selecting two resistors. In addition, the three op amps in the Tow-Thomas topology have their non-inverting input grounded, and therefore their inverting inputs will be held ideally at virtual ground. These feature permits the use of op amps with small common mode input range.
摘要翻译：低频陷波滤波器集成电路在相对较小的硅片区域中实现，具有高线性度，从而促进了生物医学仪器中超大规模集成（VLSI）技术的应用。滤波电路采用R-2R梯级，节省大约120：1的面积。 R-2R梯子在双重配置的运算放大器滤波器电路中用作数字可编程电阻器。积分器回路拓扑用于滤波电路。优选的拓扑结构采用了Tow-Thomas电路，可以设计为先决条件增益，Q独立选择两个电阻。此外，Tow-Thomas拓扑结构中的三个运算放大器具有非反相输入接地，因此其反相输入将理想地保持在虚拟地。这些功能允许使用小型共模输入范围的运放。

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