On 14/10/2020 20:00, pepijn de vos wrote: > Hey all, > > I'm a sw dev and recent IC design graduate, who made it his mission to > improve open source tools for IC designers. > To this end I've been playing with the recently released Sky130 PDK, > which is an open source PDK that does not require any annoying NDA's and > will actually allow sharing IC designs. > > I've been looking at eeschema a bit as one of the options to do > schematic entry and simulation. However, I found that the integration > with ngspice is very limited at the moment. So I'm interested in making > this better! > > The first problem I ran into is that it can't plot the currents of a > transistor no matter what you add in terms of spice directives. More > info: > https://forum.kicad.info/t/how-can-i-plot-transistor-currents-after-a-simulation/25324/8 > So I have several questions. > Would this be a good first issue to tackle?
Hi Pepijn, Sure, go for it - and if you'll find it too hard as a starter, there's a ton of other issues in the simulator/ngspice integration... https://gitlab.com/kicad/code/kicad/-/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=ngspice > I think there are a few ways to go about it, which don't exclude each > other. One is to extend the logic that adds the currents for voltage > sources and resistors to also add transistors. Another is to update the > simulator UI to populate the signal list from the raw file, rather than > its own idea of which signals were saved, so that you can add custom > .save statements and plot them. I would by default tell the simulator to log all node voltages/pin currents (including transistor pins). Anything else (that is internal currents, etc.) should be parsed from .save directive (so I'm more in favor of option 2). > For example, two other things that would be great to add is a way to > plot algebraic expressions of different signals, This looks like a nice feature in the longer term. If you're interested in developing it, I could offer some (but not much) help due to my current workload... Tom _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
