* Bipolar transistor I-V characteristic

.lib ../../../libraries/sky130_fd_pr/PDKVERSION/models/sky130.lib.spice CORNER

* Base bias
Rb 1 2 680
X1 3 2 5 5 DEVICENAME M=1
Rc 3 4 100

* DC source for current measure
Vic 4 0 DC 0V
Vbb 5 1 DC 0V
Vce 5 0 DC 0V

.control
* Sweep Vce from 0 to 1.8V
dc Vce 0 1.8 0.01 Vbb 0 1.2 0.01
let vc = V(5) - V(3)
let vb = V(5) - V(2)
wrdata DEVICENAME.data Vic#branch vb vc
quit
.endc
.end