blob: 371931eb528f0766db76f6bfa65bc6f9eaa1525a [file] [log] [blame]
* Capacitor value test
* 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 sky130_fd_pr__cap_vpp_02p7x21p1_m1m2m3m4_shieldl1_fingercap
* 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