2009-midtermI-solutions - Q1 Name: Student No: Q2 Q3 TOTAL...

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Name: Student No: ELE 311 ELECTRONICS II SOLUTIONS MIDTERM EXAM I (25%) Q1 Q2 Q3 TOTAL 34 32 34 100 November 25 ?ℎ , 2009 Answer all three questions. Explain your assumptions. Good Luck! Q1. For circuit shown below a) Calculate the values of ? 1 and ? 2 in order to achieve maximum undistorted output swing. b) Calculate the overall voltage gain, ± ± = ² ² ³ . c) Find ² ³ ?±² which produces maximum undistorted output voltage. SOLUTION: a) In order to achieve maximum undistorted output swing the collector current of ³ 2 , ´ ´µ 2 should be set in the middle of the AC load line. Thus ´ 2 = µ ´´ ? ¶´ 2 + ? ·¸ 2 ,where ? 2 = ? 4 + ? 5 and ? ·¸ 2 = ? 4 ∣∣ ? ¹ + ? 5 (1) = 20 3 +2 ? 2 =3 Ωand ? ·¸ 2 =2 Ω =4 ·±. Consequently ´ ºµ 2 ´ 2 ·± .So µ 2 = ´ 2 ? 5 µ . Here µ »µ 2 = µ 2 + µ »º . 7 µ and µ 1 = µ 2 . 7 µ . Consequently µ 1 = µ 1 + µ =5 . 4 µ .
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Let us assume ( +1) ? 3 ( ? 1 ∣∣ ? 2 ). Then we can ignore ± ²³ 1 and write ? 1 + ? 2 ? 2 = ² ´´ ² 1 = 20 5 . 4 (2) ? 1 ? 2 = 14 . 6 5 . 4 (3) As ? 1 >? 2 , in order to satisfy the inequality ( ? 3 ( ? 1 ∣∣ ? 2 ) and increase the input impedance, we can set ? 2 as ? 2 = ( ?
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2009-midtermI-solutions - Q1 Name: Student No: Q2 Q3 TOTAL...

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