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Published byVincent Nash Modified over 9 years ago
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NOTES 27 March 2013 Chapter 10 MOSFETS CONTINUED
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MOS Structure Under Reverse Bias 2 - - - - - - - - - - - - + - Metal layer Oxide layer P-type + + + + + + + + + + + + + n-type inversion layer With large positive gate bias, there will be electrons at the interface between the oxide and semiconductor, which leads to formation of a thin n-type inversion layer Threshold voltage V T : applied gate voltage required to achieve the threshold inversion
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Voltage-Current Relationship of NMOS (1) 12
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Voltage-Current Relationship of NMOS (2) 13 Saturation region Nonsaturation region In the nonsaturation region: In the saturation region: Operation characteristics: No current through the gate oxide I G =0 Current in the channel is due to drift rather than diffusion Application: voltage controlled current source, analog switch
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CMOS Technology 17 Complementary metal–oxide–semiconductor (CMOS)
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