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Where is the input measured in a common base transistor physical model?

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Where is the input measured in a common base transistor physical model?

(a) Collector terminal

(b) Emitter terminal

(c) Base terminal

(d) Ground

This question was addressed to me in my homework.

This question is from Physical Model of a CB Transistor in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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The correct choice is (b) Emitter terminal

Explanation: In the physical model of a common base transistor amplifier the input is measured at the emitter terminal of the BJT biased device. Whereas, the output is measured across the collector terminal of the biased BJT device.

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