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Re: electromigration
some small trick if there's some EM violation on the PG(power ground) nets.
1 increase metal width (said as others)
2 use double layers metal (maybe triple)
3 make some holes on these metal(a little effect)
Re: how to calculate the EM
as i known, there is hardly a EM violation on the signal nets. It more likely happens on the P/G nets, so, if we discussed some EM violation, it is often on the P/G grid.
As others friends said, the EM violation threshold will be determined by the PVT(Process...
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