一种模拟滤波电路数字化方法

在信号处理中,滤波的优劣直接影响信息的准确性。模拟滤波虽然快捷但不灵活,数字滤波效果虽好但复杂。所以文中提出一种以模拟滤波器为基准,设计具有相同功能而且参数可调的数字滤波器的方法。并以二阶RC无源低通滤波电路为例对此过程进行说明,与模拟滤波电路和传统的数字滤波相比,该方法不仅比传统的数字滤波算法简单快捷,而且可有效防止模拟电路中器件的寄生参数、精度、温度等的影响,使滤波更加稳定。

A Method for Digitizing Analog Filters

In signal processing, filtering has a direct impact on the accuracy of signals. While analog filters are fast but inflexible, digital filters are better but more complex. Based on an analog filter, a digital filter with the same function and adjustable parameters is designed, and exemplified by a second-order RC passive low-pass filtering circuit. The new design has the advantages over conventional analog and digital filters of simple algorithm and stability without the side effect of parasite parameters, precision and temperatures factors in the analog devices.