in case of BP filter realization, the input signal voltage(Vin) is injected to the z-terminal of the VDGA1 through the floating capacitor CI. This capacitor together with parasitic impedances at the corresponding z terminal will introduced an extra parasitic pole. This can explain why the BP filter responses in Figs 12 and 13 have non-ideal gain responses at high frequencies However, this effect can be reduced by choosing smaller loading capacitor