VIN 1 0 DC 0.0
VDD 3 0 DC 5.0
VSS 4 0 DC -5.0
M1 2 1 4 4 MNMOS1 W=3U L=3U
M2 2 1 3 3 MPMOS1 W=9U L=3U
.MODEL MNMOS1 NMOS VTO=0.75 KP=25U
+LAMBDA=0.01 GAMMA=0.8 PHI=0.6
.MODEL MPMOS1 PMOS VTO=-0.75 KP=8U
+LAMBDA=0.02 GAMMA=0.4 PHI=0.6
.DC VIN -5.0 5.0 0.1
.PRINT DC V(2) ID(M1)
.PROBE
.END