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The MOSFET as a Switch: How a Voltage Opens a Channel

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NMOS as a digital switch — when V_GS is below the threshold V_t the channel is empty and the transistor is off; raise V_GS above V_t and a conducting channel forms, dropping R_DS and turning the transistor on. Wire it as an inverter and the output flips with the input.

MOSFETNMOSthreshold voltagechannel formationswitchinverter
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