CMOS INVERTER

CMOS INVERTER:- 

CMOS inverter consists of an enhancement type nMOS transistor and an enhancement type nMOS transistor working in complementary mode.
         Works in push-pull mode such that for high input nMOS transistor is on and it drives (pulls down) the output and the pMOS simply acts as the load.for low input voltage nMOS transistor is cut-off and pMOS is on and it drives (pull up) the output and the nMOS acts as load.So both pMOS and nMOS contribute equally to circuit operation.
Advantages of CMOS inverter are:- 
๐Ÿ‘‰Low power dissipation
๐Ÿ‘‰Voltage transfer curves show full swing of output voltage from 0 to Vdd.
๐Ÿ‘‰Sharp transition between states,which increases the noise margin.
The effective source substrate bias Vsb=0 for both the transistor.It is also observed that
                  Vgs n=Vin
                 VDS n=Vout

              Vgs p=-(Vdd-Vin)
             VDS p=(Vdd-Vout)
Table:- 
Vin             Vout          nMOS         pMOS 
<Vton          Voh       Cut off।         Linear
Vil।           ~=Voh    Saturation       Linear
Vth।           Vth।      Saturation       Linear
Vih।           ~=Vol       Linear         Saturation
>Vdd+Vtop  Vol       Linear          Saturation
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