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Thermal noise for short channel MOS

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hyy95120

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Hi,
I am playing with a 0.13um fab model right now. my question is , how can I set up a circuit to calculate the gamma in the MOS thermal noise formula

in the text books, gamma is 2/3 for long channels, but they say gamma can go higher in short channels, even as high as 2.5 in Razavi's book.

How can I measure this gamma with the real world BSIM3.3V2 model from the fab?

Thanks!
 

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