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I am confused what is difference between conventional analog butterworth filter and that implemented through digital technique using IIR

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    $\begingroup$ What specifically are you confused about ? What do you think is different ? $\endgroup$ – Hilmar Dec 17 '18 at 12:02
  • $\begingroup$ I am confused about their application/performance and scenarios where they are both utilized $\endgroup$ – abt Dec 18 '18 at 4:24
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If you have designed the IIR Butterworth filter using the bilinear transform method, then due to the logarithmic frequency mapping (warping), the frequency and phase responses will be distorted...

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