I did a comparison script that compare Xyce and ngspice results for different type of sweeps. I tried dc sweep for sky130_fd_pr__nfet_01v8 for tt corner simulating all Bins w and L in the model and i found max error between the two simulators was 0.033% Here is the link for comparison script and results. https://github.com/mabrains/xyce_sky130/tree/main/testcases/xyce_vs_ngspice @User @User @User @User

Very cool. For the ones that differ, is it an edge case possibly that causes this?

@Matthew Guthaus we haven’t investigated further.