ECE102_W09_Quiz2

ECE102_W09_Quiz2 - v OUT D 1 10 10 I 1 (A) = sin( t) V 1...

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ECE102 Quiz 2 – Question Pages Winter 2009 1 Student ID Name (Last, First) Question 1 (6 points): For the diode circuit shown, calculate or sketch v OUT . The diode D 1 has V* = 1V, n = 2 and I S = 10 -12 A. Question 2 (1 + 3 + 3 = 7 points): Consider the following op amp configuration. The op amp is ideal, except for the fact that it has a 2 nd order frequency response G as shown in the Bode plots (you may assume the Bode plots are sufficiently accurate approximations). (a) What is the GBW of this op amp? (b) What is the value of the loop gain at ω = 100 rad/s if R = 1k ? (c) Select R such that the PM is 45 ° . Question 3 (2 + 3 = 5 points): Consider a feedback system with open loop gain A(s) and feedback factor β (s) . The Bode plots of A(s) are given on the next page. For this question, you may assume these Bode plots are sufficiently accurate approximations of the exact frequency response. Write your answers on the separate answer pages; we will not look at these question pages.
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Unformatted text preview: v OUT D 1 10 10 I 1 (A) = sin( t) V 1 (V) = 5 G(s) + - v out R v in 1 k 10 2 10 4 <G (rad/s) -180 -90 10 10 1 | G | (dB) (rad/s) 60 10 3 ECE102 Quiz 2 Question Pages Winter 2009 2 (a) If (s) = 10-6 , what is the phase margin? (b) If (s) = 1/ s and x(t) = cos(10 t ) is applied at the input of the feedback system, what is the output y(t) ? Question 4 (6 points): Find voltage V 1 . Question 5 (6 points): In the circuit shown, D 1 and D 2 are identical diodes with V* = 1V, n = 2 and I S = 10-12 A. What is the value of ( v B v A )? [You have to give an actual value] 10 1 10 4 10 7 <A (rad/s) -90 -180 -270 10 1 10 4 10 7 | A | (dB) (rad/s) 140 0 80 = 9 |V A | = 10 V 7 k 1.7 V 1 k 1 mA V 1 v B D 1 100 1 F 2 A 5 V D 2 100 v A 1 A 1 mA 1 mA...
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ECE102_W09_Quiz2 - v OUT D 1 10 10 I 1 (A) = sin( t) V 1...

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