In the figure, given that V _ BB supply can vary from 0 to 5.0V, V _ CC = 5V, β _ dc = 200, R _ B = 100kΩ, R _ C = 1kΩ and V _ BE = 1.0V. The minimum base current and the input voltage at which the transistor will go to

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Correct answer: C. 25 and 3.5V

When switched on, V _ CE = 0 V _ CC - R _ C i _ C = 0 i _ c = V _ CC R _ C = 5 1 × 10 ^ 3 = 5 × 10 ^ - 3 A i _ c = β i _ B i _ B = i _ C β = 5 × 10 ^ - 3 200 = 2.5 × 10 ^ - 5 A = 25 using KVL at input side, V _ BB - i _ B R _ B - V _ BE = 0 V _ BB = V _ BE + i _ B R _ B = 1 + 100 × 10 ^ 3 × 25 × 10 ^ - 6 = 1 + 2.5 = 3.5V

In the figure, given that V _ BB supply can vary from 0 to 5.0V, V...

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