有源与无源滤波器教学中的对比分析方法

The Application of Comparative Analysis Approach in Teaching the Theory of Active and Passive Filters

笔者在有源滤波器教学中 ,放弃了一般教科书常用的分析模式 ,尝试了一种新方法 ,即有源滤波器与无源滤波器对比分析的方法 ,并利用等效电路及相应的传输函数 ,重点突出了滤波网络中的“源”,清楚地验证了引入“源”以后的滤波器其 Q值是大于无源滤波器的。

In this article, the author introduces a new comparative analysis approach to be apploied author's teaching of active filiter thoery while quitting the normal way taken frequently by other textbooks. That is by comparing the function of active filter and passive filter. By using the equivalent circuit and corresponding trans for function the effect of the source in filter network is emphasized. It clearly demonstrates that the 'Q' value of filter after introducing the 'source' is bigger than the one of filter without the one of filter without the 'source'.