基于Matlab的模拟滤波器仿真设计  

Simulation design of analog filter based on Matlab

作　　者：关云静 Guan Yunjing(Xi’an Traffic Enginering Institute ZTE Institute,Xi’an 710300,China)

机构地区：[1]西安交通工程学院中兴通信学院,陕西西安710300

出　　处：《无线互联科技》2022年第21期144-146,155,共4页Wireless Internet Technology

基　　金：西安交通工程学院2021年度中青年基金项目资助,项目编号:21KY-41。

摘　　要：在日常生活中,滤波器的应用是相当广泛的。在数字信号处理过程中,滤波器能够过滤杂波,保留有用信号。文章对模拟滤波器的设计原理进行了分析,在此基础上通过通带截止频率ωp=5 kHz、阻带截止频率ωp=12 kHz、通带衰减为3 dB及阻带衰减50 d B定出低通原型滤波器的阶数为7阶,通过上述参数的确定,得到低通原型滤波器的传递函数H(s),由此实现了低通滤波器的设计。其他滤波器通过频率变换即可得到,进而采用Matlab软件绘制滤波器的幅频特性曲线。由图形得知,经过频率变换所得出的几种滤波器符合设计的要求,因而达到了设计的目的。In daily life, the application of filters is quite extensive. In the process of digital signal processing, the f unction of the filter is to filter out clutter and retain useful signals. In this paper, the design principle of the analog f ilter is firstly analyzed. On this basis, the order of the low-pass prototype filter is determined to be 7 through the pass-b and cut-off frequency, the stop-band cut-off frequency, the pass-band attenuation of 3d B and the stop-band attenuation o f 50dB. Though the determination of the above parameters, the transfer function of the low-pass prototype filter is o btained, thereby realizing the design of the low-pass filter. For other filters, it can be obtained by frequency t ransformation, and then use Matlab software to draw the amplitude-frequency characteristic curve of the filter, and it is k nown from the graph that several filters obtained through frequency transformation meet the design requirements, so t he design purpose is achieved.

关 键 词：MATLAB 模拟滤波器 巴特沃斯滤波器 频率变换 

分 类 号：TN713[电子电信—电路与系统] TP391.9[自动化与计算机技术—计算机应用技术]