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Hello, thank you again for the response. I admit I am a bit lost with all of that.

What I would like to simulate is a single-ended track on a PCB. I extracted values of inductance and capacitance per length unit using Altium.

More precisely, the signal trought the PCB track is a square pulse and I want to see the response of the signal at the load (RC load).

Ideally, I would also like to see the effect of non-ideal ground of the signal, to take into account ground return path that exists on the PCB.

I think I understood the concept of common and differential mode when using a differential transmission line. But, since I use single-ended track, there is only one signal mode, right ?