Parasitic pole approximation techniques for active filter design
Parasitic pole approximation techniques for active filter design
复制标题
有源滤波器设计的寄生极点近似技术
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
R. Geiger
中科院分区：
文献类型：
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作者：
R. Geiger
本文提出了一种用一个、两个或三个运算放大器(S)逼近有源滤波器寄生极点的方法。这些近似对于运算放大器的单极点和双极点模型都是很好的，并且对于确定滤波器的稳定性是有用的。近似表达式非常简单，可以将它们包含在有源滤波器设计过程中。利用运算放大器较简单的单极点模型得到的寄生极点近似，给出了采用双极点运算放大器的有源滤波器的稳定性判据。讨论了在某些应用中包含更精确的运算放大器两极模型的必要性。对两个算例中的实际寄生极点和近似寄生极点进行了详细的比较。
A method of approximating the parasitic poles of active filters employing one, two, or three operational amplifier(s) is presented. These approximations are good for both a single-pole and two-pole model of the operational amplifier and are useful for determining filter stability. The approximation expressions are sufficiently simple that they may be included in the active filter design process. Stability criteria for active filters employing two-pole operational amplifiers are stated in terms of the parasitic pole approximations obtained using the simpler single-pole model of the operational amplifier. The necessity of including the more accurate two-pole model of an operational amplifier in some applications is discussed. Detailed comparisons of the actual and approximate parasitic poles in two examples are made.