power consumption in full adder circuit

[ssubha]

For the full adder circuit realized with one 3-input XOR gate for sum, three 2-input AND gate and one 3-input OR gate the power consumed for these gates is x mW. The full adder circuit designed from two 2:1 multiplexers, one XOR/XNOR, one AND/OR gate based on the value of c input is ymW. I find that y>x. I request you to let me know if this is because the full adder circuit in traditional way has multiple instances of same logic gate consuming less power.

 

[artmalik]

You can easily draw the circuit and see how many nets toggle..... Power = C*V*V....so you have to calculate the amount of cap that is charged during an input to output path....