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Do higher metal layers have lesser delay

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Do higher layers like M8 have lesser delay than M1 for the same length? The resistance of higher layers decreases but the capacitance increases(or not?), so there must be no net change in delay?
 

It depends on the length of wire. If you have very long wire, the higher (thicker) metal may give you lesser delay.

Please note, that higher metal may have the same thikness as the lower metal. It depends on metal stack option that you have choosen for your design. For example: 10 metal layers = 5X2Y2Z= M1(smallest thicknes) + 5Mx layers (all have x thickness) + 2My layers (2x thickness) + 2Mz layers (4x thickness).
 

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