基于Tow-Thomas二阶节的椭圆低通滤波器的设计  

Design of Elliptic Low-pass Filter Based on Tow-Thomas Biquad

作　　者：任青莲[1] 高文华[1] 

机构地区：[1]太原科技大学电子信息工程学院,太原030024

出　　处：《太原科技大学学报》2012年第5期345-349,共5页Journal of Taiyuan University of Science and Technology

摘　　要：针对滤波器的设计问题,为了提高滤波器的性能,方便滤波器的参数调整,简化滤波器的设计过程,提出了基于Tow-Thomas二阶节的椭圆低通滤波器的一种设计方法。根据给定的设计指标,首先利用MATLAB求出满足指标要求的数值传递函数,然后根据Tow-Thomas二阶节的电路结构求出其符号传递函数,再将数值传递函数与符号传递函数进行比较,综合出电路中各元件的计算公式,文中给出了设计实例并进行了PSPICE仿真,结果表明其性能完全能达到设计要求。该方法对任意阶椭圆低通滤波器都实用。In order to improve the filter performances, convenient filter parameter adjustment, simply filter design, a design method for elliptic low-pass filter based on Tow-Thomas biquad is presented. First, a numerical transfer function by MATLAB based on the given specifications is calculated. Second, the symbolic transfer function is evaluated according to the structure of Tow-Thomas circuit. Comparing the coefficients of the two transfer functions, some computing formulations of circuit elements are synthesized. This method is practical for any-order elliptic lowpass filter. A design example of the method is given, and its frequency response is simulated based on Oread/ Pspicel0.5. The results show that the performances can completely meet the design requirements. The method is practical for arbitrary order elliptic low-pass filter.

关 键 词：Tow-Thomas二阶节 椭圆低通滤波器 MATLABOrcad/Pspice10.5 仿真 

分 类 号：TN713.1[电子电信—电路与系统]