Show n-channel depletion mode mosfet, Electrical Engineering

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Q. For a transistor, when vGS = -2.0 V, find VDSsat if Vp= -4.0 V for an n-channel depletion mode MOSFET.

Solution:

Vp= -(VDSsat + vSG)
but  vSG = -vGS = -(-2.0) V
Substituting this in the above equation;

                     -4.0 V = -(VDSsat + 2.0 V)

ie VDSsat = 2.0 V

This is the value of vDS where the pinch-off will occur for the given gate-to-source voltage.


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