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Which of the following is true about the effects of rdin Drain amplifier?(a) rd Increases output impedance(b) rd Decreases output impedance(c) Output impedance remains the same(d) rd Increases input impedanceThis question was posed to me by my college professor while I was bunking the class.The doubt is from The Common Drain Amplifier topic in chapter Field-Effect Transistors of Electronic Devices & Circuits

Answer»

The correct answer is (B) RD Decreases output impedance

For explanation I WOULD SAY: Typically ZO=c||1/gm

But with rd, ZO=RS||1/gm||rd,

Hence output impedance will decrease.



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