基于信号流图的任意阶对数域滤波器设计

本文给出了一种基于信号流图的任意阶对数域电流模式滤波器的通用设计方法.用该方法产生的,n阶滤波器由2n个对数单元电路和n个接地电容组成,易于集成.在此基础上给出了三阶Butterworth滤波器的设计实例及其PSpice计算机模拟结果.     

A versatile signal flow graph realization of a general transfer function by using CDBA

A general synthesis procedure is given for a versatile signal flow graph realization of a general transfer function by using current differencing buffered amplifier (CDBA). The proposed configuration uses n+1 CDBAs, n capacitors and at most 2n+4 resistors. This number of resistors can be reduced to n+1 for special cases. The circuit is eligible to obtain a variety of transfer characteristics with the same common denominator polynomial, and it is easily converted to different modes of operations. It is straightforward to find the values of the passive elements from the coefficients of the transfer function to be realized. Simulations results are obtained by using commercially available active component AD844 and CMOS technology as well. All of these make the proposed circuit attractive.