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w/L ratio for cmos inverter

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vead

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Why is it required that the NMOS and PMOS transistors at the inverter have different W/L ratios?
 

Difference between electrons and holes mobility causes different current gain factor in pmos and nmos so to obtain the same rise/fall time in cmos inverter the W/L ration of pmos should be ~3 times higher.
 

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