Any fitting tools for inductor design?

Hi,

I am using HFSS doing some planar inductor in CMOS technology. Just wondering, are there any fitting tools that allows me to extract a lumped element model (e.g. classical PI or it's modifications, at least at one single frequency point) from the s-parameter results? Thanks very much.

I think there is a simple relationship between the Pi network and Y-parameter, which can be directly obtained in HFSS. You can export the S- or Y-parameter from HFSS, and make a simple matlab program to do the extraction. I remember R. Levy have written a paper on the extraction of equivalent circuit using numeric simulation.