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Which type of amplifiers exhibits the current gain approximately equal to unity without any current amplification?

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Which type of amplifiers exhibits the current gain approximately equal to unity without any current amplification?

(a) CE

(b) CB

(c) CC

(d) Cascade

This question was addressed to me by my school principal while I was bunking the class.

My doubt stems from Comparison of Transistor Amplifier in division Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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The correct answer is (b) CB

The explanation: In common base amplifier, input signal is applied at emitter terminal while the amplified output signal is obtained at the collector terminal with respect to ground.

For the AC signals, the base terminal is specifically connected to ground through the capacitor.

Even, the output resistance is very high & hence, the current gain is approximately equal to unity. Due to this, there is no possibility of current amplification. Consequently, the CB amplifier exhibits high voltage gain.

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