Power Dissipation in CMOS

 There are three types of power dissipation in CMOS
1. Dynamic power is dissipated only when switching
2. Leakage current is permanent and results in a continuous loss
3. Short circuit

Ptotal = Pswitching + Pshort-circuit + PLeakage
Where,
Pswitching = CLoad  * (VDD ^2)  * f
Pshort-circuit = tsc * VDD * Isc 
PLeakage = VDD * Ileakage

Where, CLoad  = Capacitive loading due to pin and nets
             VDD = Supply Volatage
             tsc =  short circuit time in cmos
             Isc = short circuit current from pmos to nmos
             Ileakage = leakage current

where leakage power is also a funtion of Vdd, Vth and W/L ratio