ECE102_F09_Final_solutions

ECE102_F09_Final_solutions - ECE 102, Fall 2009 Student ID...

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ECE 102, Fall 2009 Final 1 of 5 Student ID Name (Last, First) Question 1 (3 + 3 = 6 points): Consider the amplifier shown below together with its transfer function. (a) Based on the transfer function, for what input voltage range is the MOSFET in triode region? (b) Using the fact that V OUT = 3V when V IN = 0V (see transfer function), find the value of W of the MOSFET. Before you start the exam, fill out your name and student ID, and do the same on the answer pages. Do not take these pages apart , except for the equation sheet (which you may detach). Do NOT write on these question pages , except for your name and student ID. If you would write on them (even simple scribbles) and we find these pages on the table next to you, this may be considered cheating. QUESTIONS 3 V 1 V 5 V 4 V 1 V 2 V 2 V 3 V V IN V OUT V IN 1 k 5 V V OUT V thp = -1 V k p ’ = 10 -3 A/V 2 λ = 0 L = 1 µ m
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ECE 102, Fall 2009 Final 2 of 5 Question 2 (5 points): In this question, you need to design the amplifier below, i.e. find the values of R 1 and R 2 . In this circuit, C 1 and C 2 are large coupling capacitors, and you may approximate them as short circuits for the small signals of interest. Design according to the following specifications: 1. The bias voltage at the source of the nMOS, V S = 1 V. 2. The V GS of the nMOS, V GS 1 V. 3. The current through the nMOS, I D 2 mA. 4. Maximize the small signal gain of the amplifier proper, i.e. maximize | A vo |. (Note: r o = since λ = 0). Question 3 (5 points):
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This document was uploaded on 05/26/2010.

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ECE102_F09_Final_solutions - ECE 102, Fall 2009 Student ID...

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