I also added a couple of inductors into MPW-B. The best I could do for modelling was to use ASITIC. I wish there was a good open source method of moments simulator. I would love to have a crack at that myself but have no time currently

FastHenry is a pretty good 3D field equation solver for layout. There is also Space from TU Delft, which became open source last year.

When I tried FastHenry it did seem good at what it did but the trouble is it only calculates inductance (as far as I know) which is troublesome when you want to know where the self-resonant frequency is. In my experience you tend to want to operate as close as you can to SRF for best performance. I haven't tried space, I will definitely give that a shot

@yrrapt could it be this one? http://www.space.tudelft.nl/

That looks really capable. Thanks for the link. Will have a dive into the examples

@yrrapt @Tim Edwards Just wondering how the structure fro ASITIC or Space or Fasthenry was copied into as a design. Is it integrated in Magic as @yrrapt mentioned or one has to draw with hand once the structure is generated ? I am also looking for a method to synthesize custom inductors

@yrrapt : I think the open source version was posted on github. I know someone who was using it and made a fair amount of progress setting it up with the Skywater process.

@Tim Edwards you're right, I just managed to find it: https://github.com/space-tudelft/cacd Will compile it and try it out

@Tim Edwards Yes, I have also followed the same flow. Previously, we had a Helic tool to generate the inductor of need (L and Q and metal layer) and extract the S parameter using EMX. Although pdk had inductor pcell, I have found this far from optimum so the above flow was perfect. But yes all were commerial tools. if there was a way using open source tool to create the Inductor which could somehow be ported to the pdk one part of this step is addressed.