请教一个pspice仿真问题

是两输入或非门的直流传输特性模拟
代码如下：
.MODEL MODN NMOS LEVEL=2
+CGSO=0.350e-09 CGDO=0.350e-09 CGBO=0.150e-09
+CJ=0.300E-03 MJ=0.450e+00 CJSW=0.250e-09
+MJSW=0.330e+00 IS=0.000e+00
+JS=0.010e-03 PB=0.850e+00 RSH=25.00e+00
+TOX=15.50e-09 XJ=0.080e-06
+VTO=0.850e+00 NFS=0.835e+12 NSUB=64.00e+15
+NEFF=10.00e+00 UTRA=0.000e+00
+UO=460.0e+00 UCRIT=38.00e+04 UEXP=0.325e+00
+VMAX=62.00e+03 DELTA=0.250e+00 KF=0.275e-25
+LD=0.75e-06 WD=0 AF=1.500e+00
.MODEL MODP PMOS LEVEL=2
+CGSO=0.350e-09 CGDO=0.350e-09 CGBO=0.150e-09
+CJ=0.500E-03 MJ=0.470e+00 CJSW=0.210e-09
+MJSW=0.290e+00 IS=0.000e+00
+JS=0.040e-03 PB=0.800e+00 RSH=47.00e+00
+TOX=15.00e-09 XJ=0.090e-06
+VTO=-0.726e+00 NFS=0.500e+12 NSUB=32.80e+15
+NEFF=2.600e+00 UTRA=0.000e+00
+UO=160.0e+00 UCRIT=30.80e+04 UEXP=0.350e+00
+VMAX=61.00e+03 DELTA=0.950e+00 KF=0.475e-25
+LD=0.75e-06 WD=0 AF=1.600e+00
Vd 2 0 5
MN1 out A 0 0 MODN L=0.8u W=2.4u
MN2 out A 0 0 MODN L=0.8u W=2.4u
MP1 1  A 2 2 MODP L=0.8u W=2.4u
MP2 out A 1 1 MODP L=0.8u W=2.4u
Vin A 0 5
.DC Vin 0 5 0.01
.PROBE  
.END
错误是：
ERROR -- Convergence problem in DC sweep
  Last node voltages tried were:
NODE   VOLTAGE     NODE   VOLTAGE     NODE   VOLTAGE     NODE   VOLTAGE
(    1)    3.3624  (    2)    4.5357  (    A)    4.2908  (  out) 44.44E-12  
  These devices failed to converge:
    MP1       MP2      
不知道改怎么改 ，谢谢指教 ^_^

虽然不肯定是否是错误原因，但是你的mp2为什么衬底不接高电平？