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Dynamic Power

May 24, 2015, anysilicon

Dynamic power refers to that component of the power dissipated in the CMOS circuit when the inputs switch from one level to another. Dynamic Power is the major component of the power dissipated in circuits and also contributes to the peak power. It is a function of the supply voltage, the switching frequency and the output load.

 

Dynamic Power has two major components: the short circuit power and the switching power. The switching power is due to the switching current which flows from the supply voltage to the output capacitance and from the output capacitance to the ground. Short circuit power, on the other hand, takes into account the short-circuit current that flows from the supply voltage to the ground when both NMOS and the PMOS are simultaneously on.