How can I run nested sweeps of different nature in xschem using ngspice? For example, say I want to run various AC analysis of a varactor under different DC bias values (to get its C vs V and Q vs V curves)... how would I do it? (If the answer is "scripting", please take it easy with me, as I'm pretty much a n00b at it ^^' )

Yes, scripting. There are 2 paths, one using ngspice control looping and the second running using Python to run each netlist.

I think I need a walkthrough 😅