Design of IIR Digital Filters - Methods and Design Steps

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Basic Steps in analog to digital filter conversion:
  • Map the desired digital filter specification in to an equivalent analog filter
  • Derive the analog transfer function H(s)
  • Transform the analog transfer function in to an equivalent transfer function of desired digital filter  
Methods used to design of IIR Digital Filters:
  1. Approximation of Derivatives
  2. Impulse Invariance Method
  3. Bilinear Transformation Method
  4. The Matched z-Transform Method






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