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Tap Cell

1. What is a ‘tap cell’

The basic idea with a global substrate tap methodology is to omit internal substrate taps from the standard cells and instead to sprinkle dedicated tap cells throughout the P&R layout.  The process design rules require that no piece of source/drain diffusion (inside a standard cell) be more than some maximum distance away from the tap diffusion inside at least one of the sprinkled tap cells.

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