simple diode test
V1   1  0  10.
R1   1  2  100.K
D1   2  0  ddd   m=2. 
.model  ddd  d  ( is= 10.f  rs= 0.  n= 1.  tt= 0.  cjo= 1.p  vj= 1.  m= 0.5 
+ eg= 1.11  xti= 3.  kf= 0.  af= 1.  fc= 0.5 )
.list
.print op v(1) v(2) i(v1) i(r1) id(d1) vd(d1) req(d1) cap(d1) z(d1) zraw(d1) y(d1) z(2)
.op
.print dc v(1) v(2) i(v1) i(r1) id(d1) vd(d1) req(d1) cap(d1) z(d1) zraw(d1) y(d1) z(2) iter(0)
.dc v1 -10 10 2
.stat notime
.dc v1 9.999 10.001 .001
.op
.stat notime
.end