* 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 0 4 DC 0V
Vbb 5 1 DC 0V
Vce 5 0 DC 0V

.control
* Sweep Vce from 0 to 3.3V, Vbb from 0 to 2.0V
dc Vce 0 3.3 0.02 Vbb 0.6 0.9 0.01
let beta = Vic#branch / Vbb#branch
let vc = V(5) - V(3)
let vb = V(5) - V(2)
wrdata DEVICENAME_beta.data beta vb vc
echo maximum beta
print maximum(beta)
quit
.endc
.end