Threshold voltage

Depletion region of an nMOSFET biased below the threshold

Depletion region of an nMOSFET biased above the threshold with channel formed

The threshold voltage, commonly abbreviated as V_th or V_{GS (th)}, of a field-effect transistor (FET) is the minimum gate-to-source voltage differential that is needed to create a conducting path between the source and drain terminals.

For an nMOS device at gate-to-source voltages above the threshold voltage ((V_GS > V_th) but still below saturation (less than "fully on", (V_GS − V_th) > V_DS), the transistor is in its 'linear region', also known as ohmic mode, where it behaves like a voltage-controlled variable resistor.

单词	Gate voltage
释义	Gate voltage 英语百科 Threshold voltage The threshold voltage, commonly abbreviated as V_th or V_{GS (th)}, of a field-effect transistor (FET) is the minimum gate-to-source voltage differential that is needed to create a conducting path between the source and drain terminals. For an nMOS device at gate-to-source voltages above the threshold voltage ((V_GS > V_th) but still below saturation (less than "fully on", (V_GS − V_th) > V_DS), the transistor is in its 'linear region', also known as ohmic mode, where it behaves like a voltage-controlled variable resistor.
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Gate voltage

Threshold voltage