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What is the value of input resistance in the CE short circuit current frequency response model?

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What is the value of input resistance in the CE short circuit current frequency response model?

(a) hoe

(b) hib

(c) hic

(d) hie

The question was posed to me at a job interview.

This is a very interesting question from The CE Short Circuit Current Frequency Response in division High Frequency Transistor of Electronic Devices & Circuits

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Right option is (d) hie

Explanation: The input resistance of a common emitter (CE) amplifier can be expressed in terms of hybrid parameters in the CE short circuit current frequency response 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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