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Power rail design concept for Standard cell

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Bhanuprakash

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Hi.. I am designing a standard cell library in 180nm technology using cadence virtuoso tool. How to decide the width of the power rails for these standard cells? please help me...
 

As much as you can provide after signal routing done. Usually 1 routing grid track.
 

Check by Placing Inverter cell, run it with desire frequency and check the drop.
 

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