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Some questions about MOS transistors

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shemo

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1)What's difference between accumulation and depletion?
2)Why during weak inversion, the electron current from source to drain is mainly due to diffusion not drift current (Electric field)?

3)Is Fermi level defined as 50% point of find a electron? beblow that in valence band is 1 and above that in conduction band its 0.
 

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