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FIELD-EFFECT Transistors
(FETs)
 MOSFET
= metal-oxide semiconductor
FET
 MOSFET can be made quite small,
compared to BJT
 Most VLSI circuits are MOS technology:
digital logic & memory chips can be
made just from MOS FETs (no diodes
or resistors are needed)
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1
Enhancement-type NMOS
mm , W = 2 - 500 mm,
oxide layer thickness 0.02 - 0.1 mm
 L=1-10
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n-channel MOSFET (“NMOS”)
 +ve
voltage applied to gate :
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NMOS with small v_DS
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NMOS as v_DS increases
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