For the following Darlington pair configuration, find the exact small-signal current gain $A_i = i_o/i_i$ if the transistor parameters are $\beta_1 = 100$ and $\beta_2 = 200$. Assume that $r_o = \infty$.
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The current gain of the first transistor (Q1) is given by β1 = 100. The current gain of the second transistor (Q2) is given by β2 = 200. Show more…
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