【转载】常用滤波器设计软件

本文详细介绍了51单片机系统中滤波器设计的基本概念,包括有源滤波器和无源滤波器的原理、配置、设计软件以及应用实例。重点分析了MFB和Sallen-Key两种有源滤波器拓扑形式,并推荐了FilterFree、FilterLab2.0和FilterWizPro等滤波器设计软件。

 

滤波器设计是电子电路设计中经常碰到的问题。在51单片机系统中,51单片机VCC引脚旁的10u和0.1u的电容就是最简单的滤波器和滤波装置,但复杂的滤波器设计更是手机等高频电路系统中必不可少的硬件装置。

一般的,滤波器可分为有源滤波器和无源滤波器两种。其中,有源滤波器由集成运放和电阻、电容等组成,根据高通、低通、带通还是带阻方式,电容和电阻的配置位置有所不同。一般说来,有源滤波器根据配置位置和功能的不同,普遍采用MFB和Sallen-Key两种拓扑形式。

典 型的软件有:TI公司的FilterPro,Microchip公司的FilterLab2.0等,均是免费软件,可从其网站上免费下载使用。另一款非常 著名的设计软件是FilterWiz Pro,功能与FilterPro和FilterLab2.0类似,还可以选择各阶滤波器的拓扑结构。FilterWiz Pro无免费版本。

需要说明的是,FilterLab2.0软件的稳定性明显好过FilterPro,虽然FilterPro在业界口碑尚可。

无源滤波器就是常说的RC、RLC等纯粹采用电阻、电容和电感等无源器件组成的滤波装置,成本低廉,稳定性好。一般的低频滤波器网络普遍采用电阻和电容组成,只有高频才会考虑配置电感装置。

网络上的无源滤波器设计软件较多。但博主推荐FilterFree软件。FilterFree软件为免费滤波器设计软件,可完成有源滤波器设计,也可进行无源滤波器设计,可从nuhertz公司网站上免费下载。更强大功能的Filter Solution软件不但可进行有源和无源滤波器软件设计,还可进行器件数值的更改和其他器件参数的自动匹配。

 

http://blog.21ic.com/user1/8418/archives/2012/88596.html

转载于:https://www.cnblogs.com/jiansiming/articles/2518617.html

滤波器设计软件FilterLab v2.0 Release Notes for FilterLab v2.0 ----------------------------------------------------------------- Table of Contents ----------------------------------------------------------------- * What's New in v2.00 * How to Contact Microchip ------------------------------------------------------------ What's New in v2.00 ------------------------------------------------------------ Highpass Butterworth Salen-Key Filters Highpass Chebychev Salen-Key Filters Bandpass Butterworth Multiple Feedback Filters Bandpass Chebychev Multiple Feedback Filters Filter Selection Wizard Spice Listing View Radian Phase View Copy Spice Listing to Clipboard Copy Circuit to clipboard Copy Response Chart to Clipboard Save Response as JPEG Save/Open Projects ----------------------------------------------------------------- How to Contact Microchip ----------------------------------------------------------------- Online Support --------------- Microchip provides online support on the Microchip World Wide Web (WWW) site. The web site is used by Microchip as a means to make files and information easily available to customers. To view the site, you must have access to the Internet and a web browser such as Netscape or Microsoft Explorer. Files are also available for FTP download from our FTP site. Connecting to the Microchip Internet Web Site --------------------------------------------- The Microchip web site is available by using your favorite Internet browser to attach to: http://www.microchip.com The file transfer site is available by using an FTP service to connect to: ftp://ftp.microchip.com The web site and file transfer site provide a variety of services. Users may download files for the latest development tools, data sheets, application notes, User's guides, articles, and sample programs. A variety information specific to the business of Microchip is also available, including listings of Microchip sales offices, distributors and factory representatives. Other data available for consideration is: * Latest Microchip Press Releases * Technical Support Section with Frequently Asked Questions * Design Tips * Device Errata * Job Postings * Microchip Consultant Program Member Listing * Links to other useful web sites related to Microchip Products * Conferences for products, Development Systems, technical information and more * Listing of seminars and events ----------------------------------------------------------------- Installation ----------------------------------------------------------------- To install with the single file executable: Save the executable to a directory on your hard drive. Select Run from the Start menu. Type in the directory and executable file name and click OK. Follow the instructions on the installation program's dialog boxes. To install from a CD: Select Run from the Start menu. Select Setup.exe on the CD. Click OK. Follow the instructions on the installation program's dialog box
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