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How are the power rail widths calculated in a stdcell?

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chapar

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How are the powerrail widhts calculated in a stdcell?
 

Re: stdcell

Probably, following some EM rules and IR drop...
 

stdcell

As far as I know current required for a stdcell in working condition is in the order few micro Amps.
Know the current rating from designer for each std cell.
Sum up the each std cell current which are going to be aborted/shared(side by side and upside). you will get total current rating.
Calculate the width of the power bus for the required current rating using EM rules from DRD.
 

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