Difference between Bilinear Transformation and Impulse Invariant Method of IIR filter design:

The difference between Bilinear Transformation and Impulse Invariant Method of IIR filter design is given in table below

Sl no Bilinear Transformation Impulse Invariant Method
1 Conformal mapping from S-plane to Z-plane. Many to one Mapping.
2 S-plane poles are mapped only once in Z-plane. Higher frequency poles will alaise the low frequency poles that differ by intger multiple 2π/T.

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