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← ScienceWhich mechanism causes increased voltage droop under pulsed load on unbypassed digital IC power rail?
A)Inductive supply-return resonance
B)Via-pad current crowding
C)Capacitance equivalent series resistance✓
D)Charge carrier velocity saturation
💡 Explanation
Voltage droop occurs from high di/dt transients interacting with capacitance's ESR. Pulsed load current flows through the parasitic equivalent series resistance; therefore, the voltage is reduced rather than inductive resonance or other effects under fast transient loads, because ESR dominates.
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