PMOS Load Inverter :

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

Figure below shows the input output characteristics of the PMOS load inverter. The output voltage equals V_DD - V_TH2 if V _in < V_TH1.

For V_in > V_TH1 V_out follower an approximately straight line. As V_in exceeds V_out + V _TH1 i.e. beyond point A M₁ enters in the triode region and the characteristics becomes non linear.