*Jim Waldrop, 6.371 PS1, Problem 1
.include /mit/6.371/ps1spice/ps1_mosmodels.sp
.option post
.temp 25

VDD pwr 0 DC 'vdd'
.param vdd=5.0v

Vi	in 0 DC 0

MN0	pwr in b1 0	nmos w=1.8u l=1.2u
Vb0	b1 0 dc 0v

MN1	pwr in b2 0	nmos w=1.8u l=1.2u
Vb1	b2 0 dc 1v

MN2	pwr in b3 0	nmos w=1.8u l=1.2u
Vb2	b3 0 dc 2v

MN3	pwr in b4 0	nmos w=1.8u l=1.2u
Vb3	b4 0 dc 4v

.op
.dc Vi 0 'vdd' .01

.end