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I know what pinch off voltage is.It is the gate-source voltage at which drain current is cut off completely (pinched off) is called the pinch-off voltage.

But what is pinched off current?

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  • \$\begingroup\$ That small current that flows during pinch-off \$\endgroup\$
    – Andy aka
    Apr 25, 2020 at 19:07
  • \$\begingroup\$ Can you be more specific \$\endgroup\$
    – Pole_Star
    Apr 25, 2020 at 19:11
  • \$\begingroup\$ As why it flows and how. \$\endgroup\$
    – Pole_Star
    Apr 25, 2020 at 19:11
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    \$\begingroup\$ Your statement that "drain current is cut off completely" at pinch-off is not correct. \$\endgroup\$ Apr 25, 2020 at 19:18
  • \$\begingroup\$ My prof told me so😓 \$\endgroup\$
    – Pole_Star
    Apr 25, 2020 at 19:22

1 Answer 1

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enter image description here

For any particular gate-source bias voltage, when the drain-source voltage reaches a certain value, the characteristic of drain-source voltage vs drain current becomes a near-straight horizontal line. This is the "pinched-off" current and it is near constant with changes to drain-source voltage.

Picture taken from this quora page for convenience.

Here's another picture showing the characteristic with different gate bias voltages but this time it's for a JFET (hence negative gate voltages with respect to source): -

enter image description here

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