| * Self-biased current source testbench | |
| * Include SkyWater sky130 device models | |
| .lib "/usr/share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice" tt | |
| .param mc_mm_switch=0 | |
| .include "../mag/sbcs1v8.spice" | |
| * supply voltages | |
| vdda vdda 0 1.8 | |
| vssa vssa 0 0.0 | |
| * DUT | |
| x0 io vdda vssa x sbcs1v8 | |
| vo io vssa 0.0 | |
| .option gmin=1e-13 | |
| .control | |
| dc vdda 10m 1.8 10m | |
| plot i(vo) | |
| plot abs(deriv(i(vo))/i(vo)) ylog | |
| dc temp -40 125 1 | |
| plot i(vo) | |
| .endc | |
| .end |