Help me find the gm of this circuit

vdd 14 0 5
vin 1 0 1.5
itun 0 6 1u
ibias 0 2 20u
vin2 11 0 1.5
vtunmin 13 0 .2
vtun 12 0 .2
ix 5 20 30u

M1 2 1 3 0.2 N1 L=.35u W=2.8u
M2 3 2 0 0 N1 L=.35u W=2.8u*
M4 4 2 0 0 N1 L=.35u W=2.8u*
M3 20 1 4 0.2 N1 L=.35u W=2.8u
M2a 5 5 8 0.2 P1 L=.35u W=2.8u
M1a 8 13 14 0.2 P1 L=.35u W=2.8u
M6 7 6 0 0 N1 L=.35u W=1.4u*
M5 6 1 7 0 N1 L=.35u W=2.8u*
M7 15 6 0 0.2 N1 L=.35u W=3.85u
M8 12 1 15 0.2 N1 L=.35u W=2.8u
M11 12 11 10 0.2 P1 L=.35u W=2.8u
M4a 10 5 9 0.2 P1 L=.35u W=2.8u
M3a 9 12 14 .1 P1 L=.35u W=2.8u
M10 12 1 16 0.2 N1 L=.35u W=2.8u
M9 16 2 0 0 N1 L=.35u W=.35u*

*model = bsim3v3
*Berkeley Spice Compatibility
*Lmin= .35 Lmax= 20 Wmin= .6 Wmax= 20
.model N1 NMOS
+Level= 8
+Tnom=27.0
+Acnqsmod=1 elm=3
+Capmod=3
+Nch= 2.498E+17 Tox=9E-09 Xj=1.00000E-07
+Lint=9.36e-8 Wint=1.47e-7
+Lintnoi=1e-9
+Vth0= .6322 K1= .756 K2= -3.83e-2 K3= -2.612
+Dvt0= 2.812 Dvt1= 0.462 Dvt2=-9.17e-2
+Nlx= 3.52291E-08 W0= 1.163e-6
+K3b= 2.233
+Vsat= 86301.58 Ua= 6.47e-9 Ub= 4.23e-18 Uc=-4.706281E-11
+Rdsw= 650 U0= 388.3203 wr=1
+A0= .3496967 Ags=.1 B0=0.546 B1= 1
+Dwg = -6.0E-09 Dwb = -3.56E-09 Prwb = -.213
+Keta=-3.605872E-02 A1= 2.778747E-02 A2= .9
+Voff=-6.735529E-02 NFactor= 1.139926 Cit= 1.622527E-04
+Cdsc=-2.147181E-05
+Cdscb= 0 Dvt0w = 0 Dvt1w = 0 Dvt2w = 0
+Cdscd = 0 Prwg = 0
+Eta0= 1.0281729E-02 Etab=-5.042203E-03
+Dsub= .31871233
+Pclm= 1.114846 Pdiblc1= 2.45357E-03 Pdiblc2= 6.406289E-03
+Drout= .31871233 Pscbe1= 5000000 Pscbe2= 5E-09 Pdiblcb = -.234
+Pvag= 0 delta=0.01
+ Wl = 0 Ww = -1.420242E-09 Wwl = 0
+ Wln = 0 Wwn = .2613948 Ll = 1.300902E-10
+ Lw = 0 Lwl = 0 Lln = .316394
+ Lwn = 0
+kt1=-.3 kt2=-.051
+At= 22400
+Ute=-1.48
+Ua1= 3.31E-10 Ub1= 2.61E-19 Uc1= -3.42e-10
+Kt1l=0 Kt1=-0.1 Prt=764.3


.model P1 PMOS
+Level= 8
+Tnom=27.0
+Acnqsmod=1 elm=3
+Nch= 3.533024E+17 Tox=9E-09 Xj=1.00000E-07
+Lint=6.23e-8 Wint=1.22e-7
+Lintnoi=1e-9
+Vth0=-.6732829 K1= .8362093 K2=-8.606622E-02 K3= 1.82
+Dvt0= 1.903801 Dvt1= .5333922 Dvt2=-.1862677
+Nlx= 1.28e-8 W0= 2.1e-6
+K3b= -0.24 Prwg=-0.001 Prwb=-0.323
+Vsat= 103503.2 Ua= 1.39995E-09 Ub= 1.e-19 Uc=-2.73e-11
+ Rdsw= 460 U0= 138.7609
+A0= .4716551 Ags=0.12
+Keta=-1.871516E-03 A1= .3417965 A2= 0.83
+Voff=-.074182 NFactor= 1.54389 Cit=-1.015667E-03
+Cdsc= 8.937517E-04
+Cdscb= 1.45e-4 Cdscd=1.04e-4
+ Dvt0w=0.232 Dvt1w=4.5e6 Dvt2w=-0.0023
+Eta0= 6.024776E-02 Etab=-4.64593E-03
+Dsub= .23222404
+Pclm= .989 Pdiblc1= 2.07418E-02 Pdiblc2= 1.33813E-3
+Drout= .3222404 Pscbe1= 118000 Pscbe2= 1E-09
+Pvag= 0
+kt1= -0.25 kt2= -0.032 prt=64.5
+At= 33000
+Ute= -1.5
+Ua1= 4.312e-9 Ub1= 6.65e-19 Uc1= 0
+Kt1l=0

.option dcon= 1

.DC vtun .2 .5 .1
.DC itun 1u 10u 1u


.probe gm_Id=par('Ibias/V(M1)')
.END

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