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lab7a - 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