What is the significance of "IR drop" (voltage drop) analysis in chip power distribution network design?
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The correct answer is A) IR drop is voltage loss across the resistive power grid as current flows through it; excessive drop can leave some chip areas with insufficient voltage, causing timing failures or errors, so power grid design must keep IR drop within limits
Correct Answer
IR drop is voltage loss across the resistive power grid as current flows through it; excessive drop can leave some chip areas with insufficient voltage, causing timing failures or errors, so power grid design must keep IR drop within limits
As current flows through the resistive metal traces of the power grid, voltage drops occur (V=IR); if certain regions experience excessive drop, the effective supply voltage to cells in that region decreases, which can slow down switching speed (affecting timing) or, in extreme cases, cause functional failures — so power grid design includes IR drop analysis and mitigation (e.g., wider power straps).