17 - FET Intro - EECS 320 Field Effect Transistor...

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EECS 320 Field Effect Transistor Introduction and MESFET/JFET J. Phillips EECS 320 Transistor Input controls aperature Output = water flow Goal: Control output with small input Analogy: Valve controls water flow Water flow = electron or hole current Valve = channel conductance controlled by electric field Electronics analogy “Off” “On” Valve Controls Flow
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J. Phillips EECS 320 Field Effect Transistor Terminals Source Gate Drain Controls conductance of channel through application of electric field Provides carriers Collects carriers E Variable channel SD Control source to drain current with gate voltage J. Phillips EECS 320 FET Materials Can you make a transistor out of a metal? Why are semiconductors so attractive for transistors?
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J. Phillips EECS 320 Gates For FETs How do we control conductance of a channel? Insulating n-type (p-type) Gate depletion channel n-type (p-type) Gate Inversion channel Insulator Depletion Inversion Field controls depletion width, channel depth
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17 - FET Intro - EECS 320 Field Effect Transistor...

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