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Which of the following configuration is used for audio signal amplification?(a) Common base configuration(b) Common emitter configuration(c) Common collector configuration(d) All configurations are equally suitedThe question was posed to me by my school principal while I was bunking the class.My doubt is from Operating Point of Transistor in division Transistor Biasing and Low Frequencies of Analog Circuits

Answer»

The correct answer is (b) Common EMITTER configuration

Best explanation: Common base configuration is USED as input stage of multistage amplifier since it has low input resistance and high output resistance. Since VOLTAGE gain is high, common emitter configuration is used for audio signal amplification. Common COLLECTOR is used for impedance matching since the voltage gain is unity.



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