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The configuration in which output impedance of transistor amplifier is highest is ___________

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The configuration in which output impedance of transistor amplifier is highest is ___________

(a) common collector

(b) common base

(c) common emitter

(d) common collector and base

The question was posed to me by my school principal while I was bunking the class.

Enquiry is from Comparison of Transistor Amplifier topic in division Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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The correct choice is (b) common base

Explanation: In Common base configuration, the input impedance is very low; While offering a high output impedance. Although the voltage is high, the current gain is low and the overall power gain is also low when compared to the other transistor configurations available.

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