开关电流椭园低通滤波器的设计

A Design of Switched Current Elliptic Low Pass Filter

通过实例，提出了由5阶RLC精园低通滤波器原型电路到相应的有源RC滤波器电路、再到开关电容滤波器电路及开关电流滤波器的设计，设计方法简单易行。由于分立元件的RLC椭园低通滤波器的归一化电路及其参数有表册可查，可以很容易地设计出所需性能的RLC滤波器，据此也可以很方便地设计出具有各种所需性能参数的开关电流滤波器，这在采样数据信号处理中是十分有用的。

This article presents a new design procedure which begins with fifth-order RLC elliptic filter prototype, proceeds to the corresponding RC active filter circuit, then switched capacitor filter circuit and finally to the switched current filter circuit. It is shown by an example to be simple and effcient. We can easily design an RLC filter with specific per formance, since the normalized RLC elliptic filter circuit consists of discrete components which technical parameters can be easily found from their data sheets. By this approach, switched current filters with different kinds of performance can also be designed efficiently. Therefore, lt is useful in sampled-data signal processing.