how many decoupling capacitor should be added?

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davidwong

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how many decoupling capacitor should be added inside a IC?
according to the theroy, we should add enough decoupling capacitor to provide a
enough tran. current ?
How can I estimate it without knowing the exact tran. current?
Is there any rough estimation of the size of these decoupling capacitor.
 

30% of full chip.
 

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