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What is the approximate hybrid parameter input resistance of a CE amplifier?

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in Electronic Devices & Circuits by (272k points)
What is the approximate hybrid parameter input resistance of a CE amplifier?

(a) hoe

(b) hib

(c) hic

(d) hie

The question was posed to me in exam.

My enquiry is from Approximate Hybrid Model and its use in CE, CB, CC topic in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Best answer
Correct answer is (d) hie

For explanation: The input resistance of a common emitter (CE) amplifier can be expressed in terms of approximate hybrid parameters. The input resistance is universally expressed as hie. This is also the same for approximate as well as exact hybrid models.

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