应用巴特沃思逼近实现三阶有源低通滤波器的设计

Adopting Butterworth Approximation to Design Low—pass Filter with Third—order Active Circuit

本文介绍的设计,是应用巴特沃思逼近找到一个可实现的三阶电压转移函数,并用RC一阶有源电路和RC二阶有源电路的级联,来获得能满足上述电压转移函数的三阶有源低通滤波器。文中还提出了在设计中采用归一化方法的好处,以及去归一化的方法。

The design in this articie is about adopting Butterworth approximation to find out a third--order voItage transfer function which can be carried out, and the cascade connection of RC first--order active circuit and RC second--order active circuif, so that a third--order active circuit Iow--pass fiIter can be acquired which is fit for the voItage transfer function above. The artic aIso mentions the advantage of adopting nomaIization and the ways of denomaIization.