What is the drain current for a D-MOSFET having the characteristic values IDSS of 10 mA, VGS(off) of -4 V and VGS of + 2 V?

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ESE Electronics 2019: Official Paper
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  1. 22.5 mA
  2. 17.5 mA
  3. 12.5 mA
  4. 2.5 mA

Answer (Detailed Solution Below)

Option 1 : 22.5 mA
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ST 1: UPSC ESE (IES) Civil - Building Materials
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Detailed Solution

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Concept:

The drain current in saturation for a D-MOSFET is given by:

IDSS = Saturation Drain Current

Vp = Pinch Off Voltage

Calculation:

Given: IDSS = 10 mA,

VP = VGS(off) = -4 V, and

VGS = + 2 V

Putting on the respective values, we get the drain current as:

ID = 22.5 mA

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