CMOS LOGIC INVERTER *Enter the voltage sources into SPICE. The value of VIN can be arbitrary *because it will be incremented over a range of values by the .DC command VDD 1 0 5V VIN 2 0 0V *Enter the MOSFETs and set the geometrical factors W and L: * D G S B M1 3 2 1 1 PCHAN W=0.75U L=0.5U M2 3 2 0 0 NCHAN W=0.75U L=0.5U *Specify the parameters of the two MOSFETs: .MODEL PCHAN PMOS (VTO=-0.8 KP=21e-6 LAMBDA=0.03) .MODEL NCHAN NMOS (VTO=0.7 KP=73e-6 LAMBDA=0.01) *Instruct SPICE to plot the voltage transfer characteristic for 0 < VIN < 5V .DC VIN 0 5V 0.001V .PRINT DC V(3) *Instruct the .PROBE utility to save VOUT during the .DC sweep .PROBE V(3) .END