Consider the following circuit, where source current = 10mA, hfe = 50, hie = 1100Ω, then for the transistor circuit, find output resistance RO and input resistance RI.(a) RO = 0, RI = 21Ω(b) RO = ∞, RI = 0Ω(c) RO = ∞, RI = 21Ω(d) RO = 10, RI = 21ΩThis question was addressed to me in homework.I'm obligated to ask this question of Hybrid Equivalent Model in division Transistor Biasing and Low Frequencies of Analog Circuits

Consider the following circuit, where source current = 10mA, hfe = 50,

1.	Consider the following circuit, where source current = 10mA, hfe = 50, hie = 1100Ω, then for the transistor circuit, find output resistance RO and input resistance RI.(a) RO = 0, RI = 21Ω(b) RO = ∞, RI = 0Ω(c) RO = ∞, RI = 21Ω(d) RO = 10, RI = 21ΩThis question was addressed to me in homework.I'm obligated to ask this question of Hybrid Equivalent Model in division Transistor Biasing and Low Frequencies of Analog Circuits
Answer» Correct choice is (c) RO = ∞, RI = 21Ω The EXPLANATION is: Since hoe is not given, we can consider it to be small; i.e 1/hoe is neglected, open circuited. Hence OUTPUT RESISTANCE RO = ∞. Input resistance = hie/(1 + HFE) = 1100/51 ≅ 21Ω.

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