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ECE102_W07_Quiz2

ECE102_W07_Quiz2 - 2 Question 3(2 2 = 4 points Consider a...

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ECE102 Quiz 2 – Question Pages Winter 2007 1 Student ID Name (Last, First) Score Question 1 (3 + 2 = 5 points): Treat this opamp configuration as a feedback system. The op amp gain is G (and the op amp is otherwise ideal). (a) Find the loop gain. (b) Find the feedback factor β . Question 2 (2 + 2 + 2 + 2 = 8 points): The figure below shows the Bode plot of the open loop gain A of a feedback system. The feedback factor β = 10 -2 . (a) Find the magnitude (in dB) of the closed loop gain, | A f |, at ω = 10 3 . (b) Find the magnitude (in dB) of the closed loop gain, | A f |, at ω = 10 10 . (c) Find the magnitude (in dB) of the closed loop gain, | A f |, at ω = 10 11 . (d) Find the magnitude (in dB) of the closed loop gain, | A f |, at ω = 10 12 . 25 Write your answers on the separate answer pages; we will not look at these question pages. | A | (dB) ω (log scale) 80 10 6 +20 dB/dec 10 10 -40 dB/dec 40 10 8 10 12 10 4 10 2 120 v IN v OUT 1 k - + 1 k 1 k 1 k 1 k G 2 k

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