求助关于程序的问题

有高手可以解释一下下面的程序吗? 是基于什么软件的?

* ddcc *
.subckt  ddcc 1 2 3 4 5
m1 8 1 11 7 mod1 l=3u w=60u
m2 9 2 11 7 mod1 l=3u w=60u
m3 11 10 7 7 mod1 l=3u w=31u
m4 9 9 6 6 mod2 l=3u w=60u
m5 8 9  6 6 mod2 l=3u w=60u
m6 9 4 12 7 mod1 l=3u w=60u
m7 8 3 12 7 mod1 l=3u w=60u
m8 12 10 7 7  mod1 l=3u w=31u
m9 4 8 6 6 mod2 l=3u w=110u
m10 4 10 7 7 mod1 l=3u w=40u
m11 5 8 6 6 mod2 l=3u w=110u
m12 5 10 7 7 mod1 l=3u w=40u
vb 10 0 dc -1.5v
vdd 6 0 dc 5v
vss 7 0 dc -5v
.model mod1 nmos(level=2 ld=0.225u tox=405.000e-10 nsub=2.256e+15 vto=1.2
+kp=3.38e-5 gamma=1.0151 phi=0.6 uo=581 uexp=0.217 ucrit=115146 delta=1.36
+vmax=68535.3 xj=0.25u nfs=2.85e+12 neff=1 nss=1.000e+10 tpg=1.000 rsh=27.02
+cgdo=2.847e-10 cgso=2.880e-10 cgbo=3.841e-10 cj=4.1e-4 mj=0.465 cjsw=4.803e-10
+mjsw=0.351 pb=0.8000)
.model mod2 pmos(level=2 ld=0.1774u tox=405.000e-10 nsub=3.956e+15 vto=-1.2
+kp=3.378e-5 gamma=0.425 phi=0.6 uo=299.253 uexp=0.193 ucrit=5462.67 delta=0.913
+vmax=29720.9 xj=0.25u nfs=1.00e+11 neff=1 nss=1.000e+10 tpg=-1 rsh=107.4
+cgdo=2.263e-10 cgso=2.27e-10 cj=1.898e-4 cj=1.898e-4 mj=0.439 cjsw=2.267e-10
+mjsw=0.207 pb=0.7)
.ends
*
x1 1 2 0 3 4  ddcc
x2 5 2 4 6 7 ddcc
x3 8 2 7 9 10 ddcc
x4 11 0 10 2 12 ddcc
   

 
r1 3 0 1000
r2 6 0 1000
r3 9 0 1000
r4 2 0 1000
r5 12 0 1300

 
c1 4 0 31.83NF
c2 7 0 15.92NF
c3 10 0 7.96Nf 
v1 0 1 ac  1.1v
v2 0 5 ac  0v
v3 0 8 ac 0v
v4 0 11 ac 1v
 
.ac dec 100 1 10meg
.probe
.end

 
v1 1 0 ac 1
.ac dec 100 1 20meg
.probe
.end