Chapter 5

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NMOS Transistor

  • N-channel enhancement-mode MOSFET (metal-oxide semiconductor field effect transistor)
Nmos regions
Region
Cutoff 0
Triode
Saturation
  • The threshold voltage, , is the minimum needed to move the transistor from the Cutoff to Triode region. When is reached, a channel forms beneath the gate, allowing current to flow.
  • is usually on the order of a couple of volts
  • For small values of , is proportional to . The device behaves as a resistor whose value depends on