便携式数据采集系统中自适应抗混叠滤波器的设计  

Design of Anti-aliasing Filter for the Portable Data Acquisition System

作　　者：谭青[1] 龙杰强[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《现代电子技术》2007年第5期98-100,共3页Modern Electronics Technique

摘　　要：针对设备监测与故障诊断系统中便携式数据采集系统的设计要求,采用单片8阶椭圆低通滤波器MAX293设计了向AD端集成的内置抗混叠滤波器。提出了独特的自适应抗混叠滤波方案,阐述了其在数据采集过程中的实现原理,设计了相应的硬件实现电路,并给出了滤波过程中非线性相移误差的软件校正方法。Introduced the design request of anti - aliasing filter using in the portable data acquisition system. Designed an anti - aliasing filter integrated with AD module baaed on the 8th - order lowpass elliptic switched - capacitor filter MAX293. The implementation of self- adapting anti- aliasing filtering during the data acquiring process is presented,and a soft correction technique is given to resolve the non - linear phase shift in analogue filtering process.

关 键 词：数据采集 开关电容滤波器 抗混叠滤波 MAX293 

分 类 号：TN713[电子电信—电路与系统]