通用有源滤波器设计  

Design of Universal Active Filter

作　　者：苗汇静[1] 孙桂华 王立新[1] 

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255049 [2]烟台连营电子科技有限公司,山东烟台264003

出　　处：《电子器件》2012年第5期549-553,共5页Chinese Journal of Electron Devices

摘　　要：针对传统有源滤波器存在元件多、体积大、调试复杂、设计繁琐和滤波特性不好等缺点,提出了一种通用有源滤波器的设计方法。用滤波器芯片MAX275实现滤波功能,用单片机控制数字电位器,得到外围器件精确参数值。滤波器的各种参数用键盘设置,由LCD显示。试验数据表明,实现了2阶、4阶、6阶、8阶的低通带通滤波功能,可作为通用滤波器使用,提高了设计效率,具有较高的性价比和实用价值。A universal active filter is designed to solve the disadvantages of excessive components,bulk size,complex debugging,cumbersome design and bad filtering,which are all the characteristics of a conventional active filter.The function of filtering can be achieved through filter chip MAX275.The digital potentiometer is controlled by single chip microcomputer（MCU）to obtain accurate parameter values of external components which are set by keyboard and displayed by LCD.Data from tests show that the functions of low-pass and band-pass filtering of the second order,the fourth order,the sixth order and the eighth order can be achieved in the design.The universal filter improves efficiency with high cost-performance ratio and practical value.

关 键 词：通用滤波器 专用滤波器芯片 单片机控制 数字电位器 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构]