Power Consumption (Updating)

Two components determine the power consumption in a CMOS circuit:

1. Static power consumption: input not switching

•       sub-threshold current;
•       gate leakage

      P_s = V_cc* I_cc

2. Dynamic power consumption: input switching

•       short circuit. current from V_dd to GND
•       switching circuit. charge or discharge output capacitance. P=Cout * V_cc^2