is it possible to plot a differential output using the xschem waveform graph? Say I have

VoutP

and

VoutN

, is there anyway I can plot their difference i.e.

VoutP-VoutN

? I know I can do this with ngspice with simply

plot VoutP-VoutN

but the xschem waveform viewer is helpful for measurements

You can build the expression in xschem. See section "Expression evaluation on waves" in: https://xschem.sourceforge.io/stefan/xschem_man/graphs.html Your expression would be something like: "vout_diff; v(VoutP) v(VoutN) -"