Just another question for this moment: is there a way to get operation point values numerically, instead of viewing them on Gaw Waveform Viewer?

If you use ngspice interactively, you can show any device's parameters with the command show. https://ngspice.sourceforge.io/docs/ngspice-html-manual/manual.xhtml See 17.5.76 This thread has some instructions for diodes https://sourceforge.net/p/ngspice/discussion/127605/thread/54ae7420/ By the way, overdrive and saturation voltages aren't the same. They are approximately equal for strong inversion only. For sub-threshold operation, they are not.

For voltages and branch currents after a

OP

analysis you can also do a

print all

And how could I get the values on a text file, like LTSpice does. Is there any way?

Thank you!