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Unformatted text preview: EE 40: Introduction to Microelectronic Circuits Spring 2008: Midterm 1 Venkat Anantharam February 22, 2008 Total Time Allotted : 50 min Total Points: 50 1. This is a closed book exam. However, you are allowed to bring one page (8.5 x 11) notes, with writing on both sides. 2. No electronic devices, i.e. calculators, cell phones, computers, etc. 3. Show the steps used to arrive at your answer, where necessary. Partial credit will be given if you have the proper steps but an incorrect answer. A correct answer for a problem involving multiple steps where it is not clear how you arrived at the answer may not be given full credit. 4. Write your final answers into the boxes. 5. Remember to put down units. Last (Family) Name: First Name: Student ID: Lab Section: Signature: Max Score 1 (a) 4 1 (b) 4 2 (a) 3 2 (b) 3 2 (c) 3 2 (d) 3 2 (e) 3 2 (f) 3 3 10 4 6 5 (a) 3 5 (b) 5 Total 50 1 unknown circuit 1 A 2Ω + v- 2Ω 2Ω 2Ω- + V s 2Ω i 2 2Ω i 1 2Ω Figure 1: Circuit 1 1. In the circuit in Figure 1, each of the seven visible resistors has value 2Ω. Unfortunately, the designers forgot to specify what is in the part of the circuit in the box on the left. The voltage V s is also unknown. You are given that v equals 5 V . (a) Find i 1 . Firstly, we recognize that the current through the 2Ω resistor in the middle is i m = v 2Ω = 5 2 A Next, we consider a supernode around the unknown circuit and the two vertical aligned resistors next to it and write down the corresponding KCL equation: i 1 = 1 A + i m = 7 2 A...
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