dynamic power in CMOS

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srikanth1986

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Why is energy per transition in an inverter Cload*Vdd^2 and not half of it as per the formula?
 

Total energy dissipated per charge+discharge cycle of a cap Cload is Cload*Vdd^2.

In the charge cycle, the PMOS dissipates 1/2*Cload*Vdd^2 energy and another 1/2*Cload*Vdd^2 energy is transferred to the cap Cload that stores it.

In the following discharge cycle, the NMOS dissipates the 1/2*Cload*Vdd^2 energy that was stored in the cap.

Total energy dissipated is Cload*Vdd*2.
 

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