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For a FET having IDSS=2mA Vgs=2V and Vp=-1V, What is the value of source current?

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For a FET having IDSS=2mA Vgs=2V and Vp=-1V, What is the value of source current?

(a) 9mA

(b) 18mA

(c) 3mA

(d) 1mA

I got this question in class test.

My doubt stems from The Pinch off Voltage Vp in section Field-Effect Transistors of Electronic Devices & Circuits

1 Answer

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Best answer
Right choice is (b) 18mA

The best explanation: ID=IDSS (1-Vgs/Vp)^2

 ID=IS=2×(1+2)(1+2)=3^2×2=18mA

   IS=18mA.

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