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The configuration in which input impedance of transistor amplifier is lowest is ___________

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The configuration in which input impedance of transistor amplifier is lowest is ___________

(a) common collector

(b) common emitter

(c) common base

(d) common emitter & base

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Asked question is from Comparison of Transistor Amplifier in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Right answer is (c) common base

For explanation I would say: 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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