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由电组和电容构成的无源二端网路的转换函数,其所有权点均限制在复频率(即S平面)的负实轴上。而其另点可存在于S平面内部任何位置上。通过使用有源电路元件,比如晶体管或隧道管等,可把上述极点位置的这种限制去掉,即:转换函能有(?)共(?)极点。这使我们能够实现通常由电感——电容无源滤波器特性。免去电感的RC有源滤波器所具有的良好的滤波器特性免去电感的RC有源滤波器,对于低频应用,特别有益,因为此时电感器笨大而且价贵。
The transfer function of a passive two-terminal network consisting of an electrical group and a capacitor has its ownership point limited to the negative real axis of the complex frequency (ie, S-plane). And its other point can exist anywhere inside the S plane. By using active circuit elements, such as transistors or tunnels, etc., this limitation of the pole position described above can be removed, ie, the conversion function can have (?) common poles. This allows us to achieve the typical passive-capacitive passive filter characteristics. The good filter characteristic of the inductor-free RC active filter eliminates the inductor’s RC active filter, which is particularly beneficial for low-frequency applications because the inductor is bulky and expensive.