Comparitive Analysis of Digital Infinite Impulse Response Filter Using Impulse Invariance Method

Abstract

In Digital Signal Processing (DSP), most widely used filters are two types IIR(infinite impulse response) and FIR(finite impulse response),in this paper IIR filters designed with Impulse Invariance  method. Impulse Invariance  method provides good approximations for lowpass and bandpass frequency responses . it is best method  for designing IIR digital filters from reference analog filters due to implicitly and similarity of the frequency response of IIR digital filter to that reference analog filters. This method produces true frequency-to-frequency transformation. IIR filters are designed and analyzed by FDATOOL and the implementation cost has been designed on the basis of filter order, adder, impulse samples, and multiplier.