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一引论用电流传输器或电流反馈式放大器实现的有源滤波器的应用,其优点已引起了极大的重视,这主要是由于它有较高的带宽和信噪比。最近,已经提出了三种具有三个输入端和一个输出端的通用电压式滤波器。一种是用两个电流传输器,一个电压跟随器,二个电容和三个电阻组成了这样一个通用滤波器;另一种是用两个电流反馈式放大器,二个电容和四个电阻组成的另一种滤波器电路。最近又提出了一种仅用二个电流传输器、二个电容和三个电阻组成的新型滤波电路,然而,这些电路都使用了多余的有源或无源元件。本文介绍了一种新型的具有三个输入端
I. INTRODUCTION The advantages of using active filters with current transmitters or current feedback amplifiers have attracted a great deal of attention, mainly because of their high bandwidth and signal-to-noise ratio. Recently, three general-purpose voltage filters having three inputs and one output have been proposed. One is to use two current transmitters, one voltage follower, two capacitors and three resistors to make such a universal filter; the other is to use two current feedback amplifiers, two capacitors and four resistors Another filter circuit. Recently, a new type of filter circuit using only two current transmitters, two capacitors, and three resistors has been proposed. However, these circuits all use redundant active or passive components. This article describes a new type with three inputs