Hi all. I am trying to understand what the benefit would be of having a biquad instead of a butterworth filter in analogue implementation. For example, if I assume that -more or less- i need 2 integrating capacitor per pole, then i need the same for both a 8th order butterworth or a 4th order biquad (e.g. a OZGF). Therefore, they have the same cost, right? Is there any application where a biquad is prefereable to a buttenworth?? Thank you very much.
biquad over butter
Started by ●September 5, 2010
Reply by ●September 5, 20102010-09-05
joeDiHare wrote:> Hi all. > I am trying to understand what the benefit would be of having a biquad > instead of a butterworth filter in analogue implementation.Butterworth is a transfer function. Biquad is a circuit topology.> For example, if > I assume that -more or less- i need 2 integrating capacitor per pole, then > i need the same for both a 8th order butterworth or a 4th order biquad > (e.g. a OZGF). Therefore, they have the same cost, right? Is there any > application where a biquad is prefereable to a buttenworth??Biquad topology is preferred for the high Q poles.> Thank you very much.You don't have to thank me. Just $100 would be enough. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com