Threshold voltage

Minimum source-to-gate voltage for a field effect transistor to be conducting from source to drain

Nº Q1754002 ★

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Threshold voltage

Minimum source-to-gate voltage for a field effect transistor to be conducting from source to drain

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The threshold voltage, commonly abbreviated as Vth or VGS(th), of a field-effect transistor (FET) is the minimum gate-to-source voltage (VGS) that is needed to create a conducting path between the source and drain terminals. It is an important scaling factor to maintain power efficiency. When referring to a junction field-effect transistor (JFET), the threshold voltage is often called pinch-off voltage instead. This is somewhat confusing since pinch off applied to insulated-gate field-effect transistor (IGFET) refers to the channel pinching that leads to current saturation behavior under high source–drain bias, even though the current is never off. Unlike pinch off, the term threshold voltage is unambiguous and refers to the same concept in any field-effect transistor.

Texte : Wikipédia en anglais, CC BY-SA 4.0. · Image : Saumitra R Mehrotra & Gerhard Klimeck, modified by Zephyris (Public domain) ·