[sdiy] new to the list... already have a question :)

[Robert Pietrusko]

Hi List,

I'm curious if anyone on the list has experience
designing Boctor High Pass Notch circuits using the
Gioffi equations.  

I'm working on a 10th order Cauer filter design (split
into second-order-sections which will be designed as
cascaded high-pass notches) and for all but the first
section I am getting negative values for my Rs and Cs!
There is an inequality involving Q, Wz and Wo that my
coefficients are violating, so I'm sure this has
something to do with it.

Does anyone know of a workaround? I really need this
high-pass notch response for my filter (i think) and
I've been wrestling with it all day.

Thanks in advance for any help you can offer.

kind regards,
Bobby