| * Capacitor (4 terminal w/separate shield) value test | |
| .param TEMP=27 | |
| * Include SkyWater sky130 device models | |
| .lib "../../../models/sky130.lib.spice" tt | |
| .param freq = 1Meg | |
| .csparam freq = {freq} | |
| * Resistor bridge with capacitance | |
| V1 N2 0 1.8 | |
| IAC N3 N4 dc 0 ac 1 | |
| X1 N3 N4 0 0 sky130_fd_pr__cap_vpp_11p3x11p8_l1m1m2m3m4_shieldm5_nhv | |
| * C34 N3 N4 50E-15 | |
| R1 N3 0 1.1Meg | |
| R2 N4 0 1.2Meg | |
| R3 N2 N3 1.3Meg | |
| R4 N2 N4 1.4Meg | |
| .ac lin 1 {freq} {freq} | |
| .control | |
| run | |
| echo capacitance | |
| print imag(1/v(N4,N3))/2/PI/freq | |
| quit | |
| .endc | |
| .end |