Reply by Vladimir Vassilevsky●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
Reply by joeDiHare●September 5, 20102010-09-05
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.