IIR filter properties

IIR filter stands for infinite impulse response. In IIR filter design that are following criteria should be satisfied by designing a digital filter in the analog domain and transforming into the digital domain.
  • IIR filter sometimes unstable
  • IIR filter has difficult to design
  • Lower filter order then a corresponding FIR filter
  • Non zero pole exists in its transfer function
  • Usually, have nonlinear property
  • When phase distortion tolerable IIR usually favored
  • IIR filter has lower computational
  • IIR filter has less memory
  • Less parameter to achieve a sharp cut off filter