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 akaApr 25, 2020 at 19:07
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\$\begingroup\$ Can you be more specific \$\endgroup\$– Pole_StarApr 25, 2020 at 19:11
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\$\begingroup\$ As why it flows and how. \$\endgroup\$– Pole_StarApr 25, 2020 at 19:11
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1\$\begingroup\$ Your statement that "drain current is cut off completely" at pinch-off is not correct. \$\endgroup\$– Elliot AldersonApr 25, 2020 at 19:18
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\$\begingroup\$ My prof told me so😓 \$\endgroup\$– Pole_StarApr 25, 2020 at 19:22
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1 Answer
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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): -
answered Apr 25, 2020 at 19:17