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Pinch-off voltage may refer to one of two different characteristics of a transistor:
- in insulated-gate field-effect transistors (IGFET), "pinch-off" refers to the channel pinching that leads to current saturation behaviour under high source–drain bias.
- in junction field-effect transistors (JFETs), "pinch-off" refers to the threshold voltage below which the transistor turns off.
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- In an N-channel JFET, as Vds increases ,at a certain value Vp of Vds, the cross sectional area of the channel becomes minimum. At this voltage, the channel is said to be pinched off and the drain voltage Vp is called the pinch of voltage.