Karla Julieth Camacho Mercado
04/24/2023, 5:02 PMArman Avetisyan
04/25/2023, 5:57 AMTim Edwards
04/26/2023, 1:22 PM$PDK_ROOT/sky130A/libs.tech/ngspice/corners/
. It is not too productive to try to find individual contributors to the corner models. However, for example, in ss.spice
you can find where it picks up slow corner parameters for each device, so tracking that down to $PDK_ROOT/sky130A/libs.ref/sky130_fd_pr/spice/sky130_fd_pr__nfet_01v8__ss.pm3.spice
, you'll find the primary contributors to corner variation for the 1.8V nFET, e.g.:
toxe = 4.299402e-09
Here I'm ignoring the mismatch contribution. Compare that to the file sky130_fd_pr__nfet_01v8__tt.pm3.spice
:
toxe = 4.148e-09
and you can see that the slow corner model has a gate oxide thickness that is 0.1514 nm thicker than the typical corner model.Karla Julieth Camacho Mercado
04/26/2023, 2:14 PM