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有源滤波器通常由带有接地端的三端有源网络构成,许多具有实用价值的有源元件,如晶体管、运算放大器等等,都属于这类网络。因此,探讨三端有源网络的特性,将有助于深入研究有源滤波器的性质及其应用。我们知道,在三端无源网络中,若输入端至输出端的电压传输函数为t_1(s),当输入端与地端对调,即输入信号由原来的接地端送入,而原来的输入端接地时,其电压传输函数为:
Active filters usually consist of a three-terminal active network with a ground terminal. Many of these active components, such as transistors, operational amplifiers, etc., fall into this category of networks. Therefore, to explore the characteristics of the three-terminal active network will help to further study the nature of active filters and their applications. We know that in a three-terminal passive network, if the voltage transfer function from input to output is t_1 (s), when the input is switched to ground, the input signal is fed from the original ground. The original input When grounded, the voltage transfer function is: