midterm1-2010-solutions

# midterm1-2010-solutions - Q1 Name Student No EXAM I(25 ELE...

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Name: Student No: ELE 210 ELECTRONICS I EXAM I (25%) SOLUTIONS Q1 Q2 Q3 TOTAL 32 34 34 100 April 7 ?ℎ , 2010 Answer all three questions. Explain your assumptions. Good Luck! Q1. Sketch the output waveform of the circuit shown below, when ? ± = 9 sin(1000 ± ) ² . Show the maximum and minimum values on the sketch and also express the equations for the curves at diFerent intervals. Assume the diodes are ideal. SOLUTION: Note that ³ 0 = 1000 rad/s, so the period is given by, ´ = 2 ² ³ 0 =6 . 28 ms. ? ´ = 0 ,? ± 0 ? ± , 4 <? ± < 0 2 3 ? ± 4 3 ± ≤− 4 (1.1)

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Q2. For the circuit shown below, the input voltage ? ? varies between 10 ? and 14 ? ,and the load resistance ± ± varies between 200 Ω and 1 kΩ. A 5 . 6 ? Zener diode is used and ² ² ( ³´µ ) =10 ² ² ( ³?¶ ) . The Zener voltage is measured to be 5 . 6 ? at a test current of 20 m ³ with ± ² =10Ω . Note: Use piecewise linear model for the Zener diode, i.e. ? ² = ? ²· + ² ² ± ² . Also assume ± ?
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midterm1-2010-solutions - Q1 Name Student No EXAM I(25 ELE...

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