Design of Elliptic Low-pass Filter Based on Tow-Thomas Biquad
Wenhua Gao · Journal of Taiyuan University of Science and Technology · 2012
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 Orcad/Pspice10.5.The results show that the performances can completely meet the design requirements.The method is practical for arbitrary order elliptic low-pass filter.