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For the PMOS transistor in the circuit shown kn= 8 µA/V^2, W/L = 25,|Vtp| = 1V and I = 100μA. For what value of R is VSD = VSG?

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For the PMOS transistor in the circuit shown kn= 8 µA/V^2, W/L = 25,|Vtp| = 1V and I = 100μA. For what value of R is VSD = VSG?

(a) 0 Ω

(b) 12.45 kΩ

(c) 25.9 kΩ

(d) 38.35 kΩ

I got this question in exam.

I'd like to ask this question from MOSFETs Circuits at DC in chapter MOS Field Effect Transistors (MOSFETs) of Electronic Devices & Circuits

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Correct answer is (a) 0 Ω

Easiest explanation: VSG will be equal to VSD only when the resistance shown is zero or in other words there should not be any resistance.

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