In a Darlington pair, the overall ?=15000.?1=100. Calculate the collector current for Q2 given base current for Q1 is 20 ?A.
A)300 ma
B)298 ma
C)2 ma
D)200ma

Question

Quizplus · Accepted Answer

The overall current gain (β) of a Darlington pair is approximately the product of the current gains (β1 and β2) of the two transistors. Given β = 15000 and β1 = 100, we can find β2 as β2 = β / β1 = 15000 / 100 = 150. The collector current for Q2 (Ic2) can be calculated using the formula Ic2 = β * Ib1, where Ib1 is the base current for Q1. Given Ib1 = 20 μA, Ic2 = 15000 * 20μA = 300 mA.

In a Darlington Pair, the Overall ?=15000