Fig. 4
From: Design of infinite impulse response maximally flat stable digital filter with low group delay

Comparison of the IIR MFSDF with the IIR MFDFs in Example 3. (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 MFDFs in Example 3. (a) Magnitude responses; (b) Group delay responses.