PMOS Load Inverter :

Figure below shows the circuit diagram of the PMOS load inverter.

Fig1-PMOS-Load-Inverter.png

Figure below shows the input output characteristics of the PMOS load inverter. The output voltage equals VDD - VTH2 if V in < VTH1.

Fig2-PMOS-Load-Inverter.png

For Vin > VTH1 Vout follower an approximately straight line. As Vin exceeds Vout + V TH1 i.e. beyond point A M1 enters in the triode region and the characteristics becomes non linear.

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