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ECE102_F09_Quiz3_solutions

# ECE102_F09_Quiz3_solutions - ECE102 Student ID Quiz 3...

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ECE102 Quiz 3 – Question Pages Fall 2009 1 4 g m1 = 4 10 -3 A/V v IN r o1 = g m2 = 10 -3 A/V r o2 = R 1 = 2 k R 2 = 2 k R 3 = 3 k R 4 = 4 k R 5 = 4 k R 6 = 4 k Student ID Name (Last, First) Write your answers on the separate answer pages; we will not look at these question pages. Question 1 (1 + 5 = 6 points): (a) What is the small signal equivalent resistance R eq seen when looking into the input of the second stage (as indicated in the figure)? (b) We measure the small signal gain A v from v IN to v OUT , and find that | A v | = 2. What is the value of R 7 in this circuit? Question 2 (5 points): For the MOSFET circuit below, find the value of C L such that the small signal transfer function from v IN to v OUT has a dominant pole at 50 Hz. You may ignore the internal capacitances of the MOSFET. v OUT 10 V R 2 Q1 ± R 3 R 4 R 5 R 7 10 V Q2 Q1 Q2 1 mA R eq g m = 4 10 -3 A/V v OUT 1 mA ± v IN R 2 C L R 1 10 V r o = Q1 R 1 = 1 k R 2 = 4 k R 3 Q1 R 3 = 1 k R 6 R 1

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ECE102_F09_Quiz3_solutions - ECE102 Student ID Quiz 3...

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