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If gm=0.5mS, RS=2KΩ, determine ZOfor source follower?(a) 2KΩ(b) 1KΩ(c) 3KΩ(d) 1.5KΩThis question was addressed to me during an interview.Question is from The Common Drain Amplifier in section Field-Effect Transistors of Electronic Devices & Circuits

Answer»

Correct ANSWER is (B) 1KΩ

To EXPLAIN I WOULD say: ZO=RS||1/gm

=>1/gm=1/0.5mS=>2KΩ

2KΩ||2KΩ=1KΩ,

=>ZO=1KΩ.



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