本文介绍了一种特殊类型的RC有源滤波器——多通路滤波器。它的优良的滤波特性除用于通讯系统外,特别适于在生物电信号处理中滤除由电源引起的干扰。本文首先介绍了多通路滤波器的一般结构和一种使用旋转开关的实际结构,并推导了它们的传递函数。接着讨论了梳形陷波滤波器的滤波特性、电路实现及进一步改善其信噪比等问题。 This article describes a special type of RC active filter - a multipath filter. Its excellent filtering characteristics, in addition to its use in communication systems, are particularly suitable for filtering power-induced interference in bioelectric signal processing. This paper first introduces the general structure of multi-pass filter and a practical structure using rotary switches and derives their transfer functions. Then discussed the comb filter characteristics, circuit implementation and to further improve its signal to noise ratio and other issues.