文章从滤波器阻抗频率特性的角度出发，提出了几种具有广阔应用前景的新型混合有源滤波器拓扑。
Several new topologies of the HAPF system are proposed which come from the study on impedance-frequency characteristic of the passive filter of HAPF system.
对外电路而言，在基波频率下有源滤波器被控制为无限大阻抗，在谐波频率下被控制为小电阻。
The active filter acts as an infinite impedance to the external for the fundamental frequency and as a low resistor for harmonic frequencies.
滤波器的元件值不是用一般的综合方法，即从输入阻抗中逐个移去全极点或部分极点，而是用极点交换法求得。
The element values of filters can be calculated by permutation method instead of the usual synthesis, i. e. successive complete and partial pole removals from the input impedances.
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