Physics, asked by Johnsons8756, 1 year ago

Why is the size of pmos transistor chosen to be 2.5 times of an nmos transistor?

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Answered by shahsaleem

It is known that the mobility of holes are approximately 2.5 times lower than that of electrons in Silicon. Thus, a 2.5 time wider PMOS transistor is needed to match its on-resistance to that of pull-down NMOS device.

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