EE 42 - Spring 2006 - Poolla - Midterm 2 (solution) - EECS S rin 2006 Midterm 2 PRINT NAME(Last First SIGN YOUR NAME STUDENT ID CIRCLE ONE EE 100 EB 42

EE 42 - Spring 2006 - Poolla - Midterm 2 (solution) - EECS...

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Unformatted text preview: EECS 100 42 43 S rin 2006 Midterm 2 PRINT NAME (Last, First): SIGN YOUR NAME: STUDENT ID #: CIRCLE ONE: EE 100 EB 42 III I- III!" Ill—H—Vl Instructions: 1 Print and sign your name and enter your student ID number above. 2 Read the questions carefully. 3 Write your solution clearly. 4 You must show your work to get full credit. 5 This exam has 7 questith worth 85 points, so you should proceed at approximately 1 point per minute. Problem # 1 (2 + 2 + 2 = 6 points) Let R, L, 0 denote resistance, inductance, and capacitance respectively. What are the units of the following quantities in MKS units? Express your answer in terms of meters, kilograms, seconds, and coulombs. . Units of L/R are: (a) L/R KL cér‘ f/nc can —> L/E 7., secends Units of RC are: (b) RC kc qu 44mg au55u7p .._..‘.> sensual: Units of LC are: (c) LC 2. agazc a second: Problem # 2 (2 + 2 + 2 + 8 = 14 points) (a) If you dope pure silicon with a Group V element from the periodic table which kind of semiconductor do you get (circle the correct answer)? m p-type intrinsic (b) Shown below is the cross-section of a pn-diode. In the dashed box, draw the circuit symbol of this diode. does. [Ma ‘11.;540'3; (y an e a! MCCZ'HOM «ca—f as vex/erge wean/e . cafe. 42s? can He w /A e» c //’ reduces each? older- 522(2)! fled-rt: /P‘9d Wield // (2;!qu Varaaxlok diode - we}; a: Vo'Hugguvarz‘abio. apau‘hnee Problem # 3 (5 + 5 = 10 points) Shown below is a cross-sectional view of a silicon n-channel transistor. There are various regions that you have to name (in the shaded boxes) and label (in the shaded circle). (3.) Write the name of each region in the shaded box provided. The names of these regions are the source, drain, gate, bulk, and channel. (b) In each shaded circle, enter the appropriate labels (1,2,3,4, III, V) that are defined below. You may have to use several labels for some regions. law meaning 1 p-type region 2 n—type region 3 metal or heavily conducting region 4 insulator III regions containing dopants predominantly from Group III of the periodic table V regions containing dopants predominantly from Group V of the periodic table Problem # 4 (4+4+2+2 = 12 points) Consider the circuit shown below. The diodes are ideal. For each diode, determine if it is conducting or not conducting. Find I and V. 1 volt 2 volts Diode # 1 is conducting not conducting Diode # 2 is conducting not conducting (circle your choice) (circle your choice) Problem # 5 (4 + 4 + 4 + 4 = 16 points) Find the output resistance Rout for the circuit shown below. We suggest the following steps: (a) Redraw the circuit you have to use to find the output resistance. (4 points) (b) Analyze this circuit. (8 points) (c) Show your algebra to find Rout. (4 points) Problem # 6 (4 + 4 + 4 = 12 points) An ideal 5 volt DC source is connected to an' inverting amplifier. The output of the amplifier is connected to 8. IX!) resistive load. The overall circuit is shown below. Assume that the op—amp behaves ideally. 1K9 5 Volts ' (b) How much power does the source deliver? I; : gmA v5: 5v P5 5 IS V5 power delivered by source = m W (c) How much power does the op—amp deliver? Vosng ’— power delivered by op-amP = S 0 m M/ Pap‘mp: ASV' : S'Om W Problem # 7(4+4+1+2+2+2=15 points) The resistive network shown below is connecter to a berkelistor B. The berkelistor is a. nonlinear device with 2‘ - v characteristic shown below. Find the current i drawn by the berkelistor and the voltage 1) across the berkelistor. ...
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