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Why In MOSFET after the pinchoff voltage (vds>vgs-vth) the current remains constant (saturates) even if I go on increase the drain to source voltage.

Why In MOSFET after the pinchoff voltage (vds>vgs-vth) the current remains constant (saturates) even if I go on increase the drain to source voltage.

Grade:12th pass

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
4 years ago
Dear student

no channel exist at the drain end. but current flows due to the electric field in the depletion region. when electron comes to pinch off region, they all swept out to drain by the depletion region electric field. no of electrons reaching to drain is lesser but their average velocity increases. this results a constant current at saturation.

Regards

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