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Why is N-well, P-well and power continuity required ?

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Gayathri Jeyaram

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Why are N-well, P-well and power continuity required ?

Hi,

Filler cells are added for n well, pwell and metal 1 continuity. Why should n well p well be continuous ? I understand that Metal 1 should be continuous for min density reasons and EM reasons.

What exactly is power continuity ?

Thanks in advance. :-D
 

Two reasons. Without continuity, the design rules would probably mean you would need to space things further apart. Also, the wells need to be tied to VDD/VSS. If they're continuous, you need less well ties.
 
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