Active Filter Design Software Recommendation ?

I want to design an active filter, FDNR variety, Cauer aka elliptical
filter type, with low source impedance (opamp source) and finite load
impedance. I'm imagining LC network transformed to R/-R, with opamps
to synthesize the -R.

Any recommendation of a software package that will facilitate this ?

My backup plan is to use the load=source=1 tables in Ref Data for
Engineers (Radio, Electronics, Computers and Communications) and
do the transformations manually.

Thanks !
-rajeev-

 

[Paul Rako]

National Semiconductor has a very nice very free filter design tool
that will let you compare types and orders (ie a 4th order elliptical
vs butterworth) and then will draw you a schematic with parts and values.
It is all done online. You can drill to it from the home page
www.nationsl.com (under the "design" section). Or that link goes here:
http://webench.national.com/appinfo/webench/filters/design_requirements.cgi

rrr@ieee.org wrote:

I want to design an active filter, FDNR variety, Cauer aka elliptical
filter type, with low source impedance (opamp source) and finite load
impedance. I'm imagining LC network transformed to R/-R, with opamps
to synthesize the -R.

Any recommendation of a software package that will facilitate this ?

My backup plan is to use the load=source=1 tables in Ref Data for
Engineers (Radio, Electronics, Computers and Communications) and
do the transformations manually.

Thanks !
-rajeev-