2009-midtermII-solutions - Name: Student No: ELE 311...

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Unformatted text preview: Name: Student No: ELE 311 ELECTRONICS II SOLUTIONS MIDTERM EXAM II (25%) Q1 Q2 Q3 TOTAL 32 33 35 100 December 30 ℎ , 2009 Answer all three questions. Explain your assumptions. Good Luck! Q1. Consider circuit shown below a) Express the output voltage in terms of the input voltages 1 , 2 and 3 . b) Find the value of 3 if = 9 V, 1 = 5 V and 2 = 13 V. Assume the opamp is ideal. SOLUTION: a) = 4 ∣∣ 5 = 10 ∣∣ 15 = 6 kΩ Note that opamp is ideal, so + = 6 = 0. Then we can write = 2 + 3 where = , 2 = 2 − 2 and 3 = 3 − 3 Thus = ( 2 ∣∣ 3 ∣∣ ) ( 2 2 + 3 3 ) (1) As opamp is ideal = − 7 1 1 + ( 1 + 7 1 ) (2) Consequently = − 7 1 1 + ( 1 + 7 1 ) ( 2 ∣∣ 3 ∣∣ ) ( 2 2 + 3 3 ) (3) Let us insert the resistor values into the above equation = − 3 1 + 24 13 2 + 8 13 3 (4)...
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This note was uploaded on 05/25/2011 for the course ELECTRONIC 311 taught by Professor Umutsezen during the Fall '11 term at Hacettepe Üniversitesi.

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2009-midtermII-solutions - Name: Student No: ELE 311...

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