博客介绍了LC滤波器在数学上是线性、集总元件、无源、互易网络。线性体现在不同输入电压下输出与输入比值相同，该滤波器能接受多个同时存在的正弦波输入且无互调现象。
Mathematically, an LC filter is a linear, lumped-element, passive, reciprocal network. Linear means
that the ratio of output to input is the same for a 1-V input as for a 10-V input. Thus, the filter can accept
an input of many simultaneous sine waves without intermodulation (mixing) between them.
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