How to hand calculate a single NAND3's power?

[usa2005]

power consumption hand calculation

Hello, If I want to know the power consumption of a NAND3 gate by hand calculation (in an analog way), what method should I use? Thanks a lot.

 

[Old Nick]

nand3

I'm not sure of exactly what you're looking for, instantaneous power, steady state, average etc.
The power consumption of a digital circuit such as a NAND gate depends on useage.

But you want to measure/calculate/simulate the current flowing through the device, and you'll know the supply voltage, thus calculating the power is sraight forward.

 

[usa2005]

how can we calculate back power

Hi, thank you for replying. I want to do a hand calculation of the NAND3 gate. I wish I can have the instantaneous, average as well as worst case power consumption. I also want to take the charge sharing effect into consideration. The transistor we use is nano scale transistor, so I doubt I can not use the square law of current equation directly. What I have is one sheet of bunch of values of Ids=f(Vgs, Vds), I can measure the power in Hspice probably by the method of "look up table" (because the model file is not decided yet), I am wondering if I can calculate the power by hand calculation? Thanks a lot.