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Which of the following equation brings the relation between gate to source voltage and drain current in Self Bias?

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Which of the following equation brings the relation between gate to source voltage and drain current in Self Bias?

(a) Vgs=VDD

(b) Vgs=-ID Rs

(c) Vgs=0

(d) Vgs=1+ID Rs

The question was posed to me during an interview.

I'm obligated to ask this question of Biasing the FET topic in chapter Field-Effect Transistors of Electronic Devices & Circuits

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The correct choice is (b) Vgs=-ID Rs

For explanation: VRs=ID Rs

ButVRs+Vgs=0

Vgs=-ID Rs.

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