设计有源滤波器并不是一件枯燥无味的工作。对于五种最普通的二阶有源滤波器函数。只须运用基本设计准则就可以轻易地设计其中的任意一种滤波器。这五种滤波器是低通、高通、带通、带阻和全通型。每种滤波器都采用电阻和电容作为无源元件,和一个具有正增益的高质量运算放大器作为有源元件。产生这些传输函数有不同的方法,但是,本文所介绍的方法是一种仅用少量的元件就能实现这些函数的简 Designing an active filter is not a boring job. For the five most common second-order active filter functions. Just use the basic design criteria can easily design any of these filters. These five filters are low-pass, high-pass, bandpass, band-stop and all-pass. Each filter uses resistors and capacitors as passive components, and a high-quality op amp with positive gain as the active component. There are different ways to generate these transfer functions, but the method described in this article is a simple way to implement these functions with only a few components