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EE40 Lecture 16 - DC MOSFET

# EE40 Lecture 16 - DC MOSFET - EE40 Lecture 16 FET Models...

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EE40 Lecture 16 –FET Models Neel Shah 8/1/11

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Class Hand in all reading assignments and practice problems to me in class or OH by 8/10 Submit your iClicker# on HW5 and/or HW6 Final project parts arriving today Specialty parts taking a little longer to ship Guest lecture this Friday 8/5
Field Effect Transistor P is (effectively) a high resistance block of material, so current can barely flow from + to The n region is a reservoir of extra electrons (we will discuss the role of the n region later) When C is “on”, i.e. V C is relatively positive, then electrons from inside the P region collect at bottom of insulator, forming a “channel” + V C ------------- (Drain) (Source) (Gate) + -

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Field Effect Transistor + V C •When the channel is present, then effective resistance of P region dramatically decreases •Thus: –When C is “off”, switch is open –When C is “on”, switch is closed ------------- (Drain) (Source) (Gate) + -
Field Effect Transistor + V C •If we apply a positive voltage to the plus side –Current begins to flow from + to –Channel on the + side is weakened ------ (Drain) (Source) (Gate) + - + -

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iClicker: MOSFET Switch Review What kind of gate is this? A: AND B: NAND C: OR D: NOR E: NOT
iClicker: MOSFET Switch Review What is the output function of this setup? A: (A * B) + C + D B: (A * B) + C + D C: (A + B) * C * D D: (A + B) * C * D E: (A * B) (C + D)

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iClicker: MOSFET Switch Review How can we convert this NAND gate into an inverter (!A = C)?
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EE40 Lecture 16 - DC MOSFET - EE40 Lecture 16 FET Models...

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