What is Activity factor?

The fraction of a circuit's signals that switch per clock cycle, the α in the dynamic power formula αCV²f. It can be reduced by clock gating and similar.

Field: Power Management

Activity factor in the explanations

C is the switched capacitance, V the supply voltage, f the clock frequency and α the activity factor, the fraction of signals that switch per clock.
In the CMOS dynamic power formula P = αCV²f, what does α re…

Questions that mention Activity factor (2)

What is the dynamic power of a circuit with activity factor α = 0.1, switched capacitance C = 1 nF, supply voltage V = 1 V and frequency f = 1 GHz?
In the CMOS dynamic power formula P = αCV²f, what does α represent?

Related terms

Dynamic power CMOS ACPI Adaptive voltage scaling (AVS) Break-even time C-state Energy-delay product (EDP) Inrush current Isolation cell Level shifter

Back to the glossary