高性能数据采集系统中信号的低通滤波原理及实践

Signal Low-pass Filter Used in the High Performance Data Acquisition System Principles and Practice

讨论了在数据采集系统中对采样信号进行低通滤波的必要性，介绍了8254定时／计数器芯片及MAX292八阶低通开关电容滤波器的工作原理，并在基于高档微机和数据采集卡的系统中联合应用8254与MAX292实现了对所来信号的低通滤波，文中所述方法均已在实践中得到成功应用，其最大优点是控制方便，移植性强。

The necessity of low-pass filters used in data acquisition system is discussed. The working principles of 8254 timer/counter and MAX292 8th order low-pass switched-capacitor filter are discussed too.A computer controlled lowpass filter system is the in detail.The most advantage of this system is easy-to-control and easy-to-use.