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What is the value of input resistance in the hybrid-pi CE transistor model?

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in Electronic Devices & Circuits by (272k points)
What is the value of input resistance in the hybrid-pi CE transistor model?

(a) hoe

(b) hib

(c) hic

(d) hie

The question was posed to me in final exam.

The above asked question is from The Hybrid PI CE Transistor Model topic in chapter High Frequency Transistor of Electronic Devices & Circuits

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Right answer is (d) hie

Easy explanation: The input resistance of a common emitter (CE) amplifier can be expressed in terms of hybrid parameters in the hybrid-pi CE transistor model. 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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