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V62/04660-01YE对于如何设计高频增强电路与低通滤波器电路，我们仍然以共发射极发大电路为例。首先，说一下低通滤波器电路我们考虑一下在共发射极放大电路的集电极并联电容的作用。低通滤波电路如上图所示，此电路时截止频率为1KHz的低通滤波电路。改电路具有将1KHz频率以上的高频截止功能。这是因为集电极电阻具有频率特性，所以导致三极管放大也有频率效应。频率越高，因为电容的影响，导致电容与电阻并联的阻抗也就越小，所以电路的增益Rc/Re也就越小。