# 7 - EE 2001 Fall 2008 Problem Set 7 Solution Darlington...

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EE 2001 Fall 2008 Problem Set 7 Solution ______________________________________________________________________ Darlington Pair Transistors Q1 and Q2 are configured as a Darlington pair. Together they produce very large current gain. Find I L in this circuit. +4 V +100 V Q1 Q2 β1 = 100 β2 = 48.5 1 kΩ 5 Ω I L Both transistors are in active region. + 0.7 - + 0.7 - Hint : Fill in the blanks starting with i B1 . + 2.6 v _ 2.6 ma 0.26 a 0.2626 a 12.736 a 13 a

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Common Emitter Bias Design Select biasing resistor values for the amplifier circuit show (R C , R E , R 1 , and R 2 ). Calculate bias level with selected resistors (V CE , I C , I B ). Design guidelines: a. R C should be about 1/10 the lowest value of R L so that loading does not affect the amplifier. b. I R1 should be about 10 times I B so that transistor variance does not affect the base circuit. c. Use standard value 10% resistors – see table. Solution:
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7 - EE 2001 Fall 2008 Problem Set 7 Solution Darlington...

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