Which statement is true about dynamic power when there is no switching?

Which statement is true about dynamic power when there is no switching?

• A. Dynamic power is zero.
• B. Dynamic power is maximal.
• C. Dynamic power is independent of switching.
• D. Dynamic power is due to leakage.

Answer: (A)

Dynamic power comes from charging and discharging load capacitances whenever signals switch. If there’s no switching activity, there’s no charging or discharging, so dynamic power is zero. This aligns with the common model P_dyn = α C V^2 f, where α represents switching activity; with α = 0 (no switching) or f = 0, P_dyn = 0. Leakage power can still be present even with no switching, but that is a separate, static power component. So the statement that dynamic power is zero when there is no switching is the correct interpretation.

Dynamic power comes from charging and discharging load capacitances whenever signals switch. If there’s no switching activity, there’s no charging or discharging, so dynamic power is zero. This aligns with the common model P_dyn = α C V^2 f, where α represents switching activity; with α = 0 (no switching) or f = 0, P_dyn = 0. Leakage power can still be present even with no switching, but that is a separate, static power component. So the statement that dynamic power is zero when there is no switching is the correct interpretation.