ECE212_INV2

At VM

• NMOS is in triode region

• PMOS is in triode region

• NMOS is in saturation region

• PMOS is in saturation region

The symmetric inverter has

• Wn=Wp

• Rn=Rp

• tpLH=tpHL

To increase NMH we need to make

• NMOS stronger than PMOS

• PMOS stronger than NMOS

As Vin increases the NMOS in the CMOS inverter changes its region of operation as follows

• saturation to triode to cutoff

• cutoff to saturation to triode

• cutoff to triode to saturation

• triode to saturation to cutoff

VM=VDD/2 if

• kn=kp

• VTN=-VTP

• Wn=Wp