实现有源C低通滤波器,需要考虑的问题之一是直流偏置电路。文献[1]提出的有源C低通滤波器,受直流偏置电路中R的影响,使低频增益减小,即低频特性变坏。本文提出一种新电路,在低频时增益增大。若把两种滤波器级联,低频特性可以互相补偿。文中给出了设计公式、频率特性分析与实验结果。 One of the issues to consider for implementing an active C low-pass filter is the DC bias circuit. The active C low-pass filter proposed in [1] is affected by R in the DC bias circuit, so that the low-frequency gain is reduced, that is, the low-frequency characteristic is deteriorated. This paper presents a new circuit that increases gain at low frequencies. If the two filters cascade, low-frequency characteristics can compensate each other. The article gives the design formula, frequency characteristics analysis and experimental results.