Fig. 3
From: Design of infinite impulse response maximally flat stable digital filter with low group delay

Comparison of the IIR MFSDF with the IIR and FIR MFDFs in Example 2. (a) Magnitude responses; (b) Group delay responses.
From: Design of infinite impulse response maximally flat stable digital filter with low group delay

Comparison of the IIR MFSDF with the IIR and FIR MFDFs in Example 2. (a) Magnitude responses; (b) Group delay responses.