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In the given circuit, hfe = 50 and hie = 1000Ω, find overall input and output resistance.

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In the given circuit, hfe = 50 and hie = 1000Ω, find overall input and output resistance.

(a) RI=956Ω, RO=1.6 kΩ

(b) RI=956 kΩ, RO=2 kΩ

(c) RI=956 Ω, RO=2 kΩ

(d) RI=900Ω, RO=10 kΩ

I had been asked this question in my homework.

Enquiry is from Cascade and Darlington Amplifier in chapter General and Feedback Amplifiers of Analog Circuits

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Correct answer is (c) RI=956 Ω, RO=2 kΩ

For explanation: RO = RC = 2kΩ

Input resistance = hie||50k||40k = 0.956 kΩ.

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