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A Common drain amplifier is designed using fixed bias configuration, what is its input impedance?(a) RD + rd(b) RG(c) RD || rd(d) 0I have been asked this question in class test.Question is from The Common Drain Amplifier topic in portion Field-Effect Transistors of Electronic Devices & Circuits

Answer»

The correct answer is (B) RG

To explain: From the ac small signal model, the input impedance of FET is OPEN circuit.

Gate resistance RGIS in parallel with open circuit RESULTING in Zin=∞||RG=RG.



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