mosfet - ECEN325 Electronics Fall 2011...

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Sam Palermo Analog & Mixed-Signal Center Texas A&M University ECEN325: Electronics Fall 2011 Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET)
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MOSFET Circuit Symbols 2 NMOS PMOS MOSFETs are 4-terminal devices Drain, Gate, Source, & Body Body terminal generally has small impact in normal operation modes, thus device is generally considered a 3- terminal device 2 complementary MOSFETS: NMOS, PMOS
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NMOS Physical Structure 3 [Karsilayan]
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CMOS Physical Structure 4 [Karsilayan]
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NMOS Physical Operation 5 [Karsilayan]
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NMOS Physical Operation 6 [Karsilayan]
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NMOS I D – V DS Characteristics 7 [Karsilayan] (Saturation)
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PMOS I D – V SD Characteristics 8 [Karsilayan] (Saturation)
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Triode Region Channel depth and transistor current is a function of the overdrive voltage, V GS -V T , and V DS Because V DS is small, V GC is roughly constant across channel length
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