英文版模拟有源滤波器的MATLAB实现.docVIP

Design and relization of anlog active filter based on MATLAB School of automation, Chongqing university Email: sdu@sdu.edu.cn ABSTRACT This paper describes the basic concepts of filters introduced analog active filter design principles and approximation theory. Including Butterworth approximation, Chebyshev type I approximation, Chebyshev Ⅱ type approximation, elliptic function approximation and Bezier approximation. The first author studied the analog active filter design process and performance testing. Combines the traditional hardware design methods and software programming techniques， the MATLAB simulation of a variety of filter approximation technique of amplitude-frequency characteristic curve and an illustrative example. Butterworth filter instance on simulation studies, by the program to quickly get the minimum order and the cutoff frequency, replacing the traditional complex calculations; conveniently achieved by the analog low-pass filter to the high-pass, low-pass and band-stop filter the conversion; complex on quad op amp circuit design simulation, through its different points strike output transfer function to simulate the second-order low-pass, high pass, band pass and band-stop filter frequency characteristic curve and get better simulation results. Keywords:Analog and Active Filter;Theory of Approximation, Amplitude-frequency characteristics，MATLAB program design I、INTRODUCTION 1、Research background Filtering is a basic and important technology in signal processing , using filter we can extract the desired signal and suppress unwanted parts.?The so-called filter is a certain signal processing means that with transmission characteristics .?According to the different processed signal of filter , the filter can be divided into two types : analog and digital filters .?Analog filter is a common conversion device in the test system or a dedicated instrumentation .?For example: a band-pass filter for spectrum analyzer frequency selection device