| * 1.8 V CMOS only voltage reference 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/vref1v8.spice" |
| .include "../../sbcs1v8/mag/sbcs1v8.spice" |
| |
| * supply voltages |
| vdda vdda 0 1.8 |
| vssa vssa 0 0.0 |
| |
| * DUT |
| x0 io vdda vssa x sbcs1v8 |
| vo io ii 0.0 |
| |
| x1 ii x ref vssa vref1v8 |
| |
| .option gmin=1e-12 |
| .control |
| dc vdda 10m 1.95 10m |
| plot x ref |
| plot i(vo) |
| plot abs(deriv(ref)/ref) ylog |
| |
| dc temp -40 125 1 |
| meas dc r27 find ref at=27 |
| let refN = ref/r27 |
| plot refN |
| |
| .endc |
| |
| .end |
