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The total emitter current (IE) is given by_________

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The total emitter current (IE) is given by_________

(a) IE = IpE * InE

(b) IE = IpE – InE

(c) IE = IpE / InE

(d) IE = IpE + InE

I have been asked this question in a job interview.

My question is from The Transistor as an Amplifier topic in section Transistor Characteristics of Electronic Devices & Circuits

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Correct option is (d) IE = IpE + InE

The explanation is: The total emitter current is the sum of InE and IpE. In commercial transistors, the doping of emitter region is made much heavier than base. Hence current by majority charge carriers InE is negligible when compared to current by minority charge carriers IpE.

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