* recursive expansion of parametrized subcircuits

Xsub1a a b c sub1 w=1.5 l=0.15
Xsub1b a b c sub1 w=3.0 l=0.25

.subckt sub1 n1 n2 n3 w=1.0 l=0.5
  Xsub2a n1 n2 n3 sub2 w l m=1
  Xsub2b n1 n2 n3 sub2 w l m=2
.ends 

.subckt sub2 n1 n2 n3 w=0.0 l=0.0 m=0
  Mnmos n1 n2 n3 n1 nmos w=w l=l m=m
.ends