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An amplifier is designed using fixed bias configuration, what is its output impedance (source Resistor is bypassed)?(a) RD+rd(b) RG(c) RD || rd(d) 0The question was posed to me in an online quiz.Asked question is from The Common Source Amplifier topic in portion Field-Effect Transistors of Electronic Devices & Circuits

Answer»

Right option is (c) RD || rd

Easy explanation: By using ac equivalent of FET, gm Vgs is MADE 0. On observing the circuit from OUTPUT side, ZO=RD || rd, where RDis the drain resistance. In general, rd>>RD, ZO=RD.



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