摘要：这篇文章是一个很好的模拟滤波器的介绍。它涵盖了基本的第一和第二阶滤波器类型以及无源和有源滤波器的优点和缺点。它派生的和基本的双二阶实施，使用了几个运算放大器实现的例子进行了分析。Maxim > App Notes > Audio Circuits Filter Circuits (Analog) Keywords: analog filters, passive filters, active filters, sallen-key, state variable, biquad, filters. Feb 04, 2003 APPLICATION NOTE 1762 A Beginner's Guide to Filter Topologies Abstract:This article is an excellent introduction to analog filters. It covers the basic first and second order filter types as well as the advantages and disadvantages of passive and active filters. It derives and analyzes the basic biquad implementation using several op amp implementation examples. The world of filter design is often thought of as black magic because of the myriad of configurations, unique terminology, and complex equations. This application note will look at different filter types, shed some light on termino……