There are a couple of aspects of power consumed by CMOS integrated circuits.
- Static Power – This is the leakage power which is primarily due to sub-threshold currents in a CMOS gate.
- Leakage Power = V * I
- Dynamic Power – There are two types of dynamic power
(a) Internal Dynamic Power – Power dissipated due to charging of internal loads and the short-circuit between N and P gates
IP = ½ * C(internal) * V2 * f + V * I(short)
(b) Switching Power – Power dissipating due to charging of external loads