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Electronic Devices and Circuits - Engineering

Q1:

For an n-channel JEFT having drain source voltage constant if the gate source voltage is increased (more negative) pinch off would occur for

A high values of drain current

B saturation values of drain current

C zero drain current

D gate current equal to the drain current

ANS:C - zero drain current

JFET is normally on the device.

When Vgs is more negative, the depletion layer widens and almost touch making the device into cutoff. Since Vpinch= Vgs(cutoff), then Idrain=0. So, C is the answer.