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A common base transistor amplifier has an input resistance of 20Ω and output resistance of 100kΩ. If a signal of 400mV is applied between emitter and base, find the voltage amplification. Assume αac to be one.(a) 20(b) 50(c) 30(d) 25I have been asked this question by my college director while I was bunking the class.I'm obligated to ask this question of The Transistor as an Amplifier topic in section Transistor Characteristics of Electronic Devices & Circuits

Answer» RIGHT ANSWER is (B) 50

Explanation: IE = V/R=400M/20=20mA

IC=αIE= 1*20mA=20mA. VO=IC*RL=20m*1k=20V

Amplification, A= VO/signal voltage=20V/400m=50.


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