Hi Kris, without knowing what you are trying to achieve, I am loath to offer too much advice. Q and Fc are determined by different equations, and relate to pole locations. These are what determine the class of filter, in classic filter theory these would be Bessel, Buttterworth, etc. The filter you are using is a second order type. The MBF filter type is perhaps the most difficult of the common active filter types to design, since the interaction between components is extreme, however, having an amplifier configured in an inverting mode has the advantage over a non inverting configuration like the Sallen Key in that the output impedance of the op amp does not interact with the feedback network to reduce filter attenuation as the frequency increases.It would help if you could provide more details, such as the DAC p-p output, and what you actually need. as well as more details on the type of DAC, the clock rate, and the desired bandwidth are.Cheers,Richard
