How can I solve this Problem?

[Mr.Doyle]

Please.....can anyone help me to solve this problem?

 

[seadolphine2000]

I think that CKT(5) is the only one that can act as an inverter.
Operation:
Vin="1" --> NMOS is ON, PMOS is OFF --> Vo goes to zero through the NMOS.
Vin="0" --> NMOS is OFF, PMOS is ON --> Vo goes to VDD through the PMOS.

 

[Mr.Doyle]

thanks for replying....

But CKT(4) is also inverter..... and I I think the CKT(3) is inverter

But the Prablem is how can compare these inverters in terms of speed , power and area

 

[bunalmis]

Fig. 3 inverter but, P mos current increase if vin=1. (Not good for power loss but faster)

Fig. 4 inverter but Vin=0 Vo=Vdd-Vth (Not good)

Fig. 5 inverter and not any problem (Good for speed and low power)

 

[amriths04]

i think ckt.5 is better. it will also be fast.

 

[eecs4ever]

circuit 5 is just a regular inverter.

you can see it if you redraw the transistors to be straight instead of sideways.