lab4c   -  MOS iv sweep vds to 5v, vgs=0, vgs=1,2,3,4,5
.option post list node
.param length=0.65u width=2u
.temp 25
.dc vds 0 5 .1 vgs 0 5 1
.model nch nmos level=28
.probe v(vds) i(m1)  $ this is the same as i1(m1) - the drain current
m1 vd vg 0 vb nch l=length w=width
vds vd 0
vgs vg 0
vbs vb 0 0v
.end