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Why does shrink factor in different IC technology is typically less than proportion of technology size squared?

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mohamis288

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Hello,
Why does shrink factor in different IC technology is typically less than proportion of technology size squared?
for example, imagine we want to immigrate from 250nm to 180nm. for a given IC, I expect shrink factor in best situation would be (250/180) squared. what makes this shrink factor lower that the maximum and sometime shrink factor = 1 ?
 

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