lab6a - the alter control
.options list node post
.model snpn npn is=sis bf=sbf
.param sis=1e-16 sbf=150
.tf v(out) vin
vin in 0 1 1
q1 vcc 1 2 snpn
q2 3 4 2 snpn
q3 vcc 3 out snpn
r1 in 1 20k
r2 vcc 3 200k
r3 out 4 180k
r4 4 0 20k
it 2 0 100u
vcc vcc 0 20
.alter @@ Change is to 1e-15 / bf to 100
.param sis=1e-15 sbf=100
.alter @@ Change is to 1e-14 / bf to 50
.param sis=1e-14 sbf=50
.alter @@ Change is to 1e-13 / bf to 25
.param sis=1e-13 sbf=25
.end