Exam 2 with Answers - Microelectronic Circuits | ECE 3040, Exams of Electrical and Electronics Engineering

Download Exam 2 with Answers - Microelectronic Circuits | ECE 3040 and more Exams Electrical and Electronics Engineering in PDF only on Docsity! ECE 3040B Microelectronic Circuits Exam 2 October 25, 2001 Dr. W. Alan Doolittle a . Print your name clearly and largely: 24 [ uty On Ss Instructions: Read all the problems carefully and thoroughly before you begin working. You are allowed to use 1 new sheet of notes (1 page front and back), your note sheet from the previous exam as well as a calculator. There are 100 total points in this exam. Observe the point value of each problem and allocate your time accordingly. SHOW ALL WORK AND CIRCLE YOUR FINAL ANSWER WITH THE PROPER UNITS INDICATED. Write legibly. If I can not read it, it will be considered to be a wrong answer. Do all work on the paper provided. Turn in all scratch paper, even if it did not lead to an answer. Report any and all ethics violations to the instructor. Good luck! Sign your name on ONE of the two following cases: I DID NOT observe any ethical violations during this exam: I observed an ethical violation during this exam: First 25% Multiple Choice (Select the most correct answer) 1,) (S-points) When analyzing a circuit using the CVD diode model, which of the following is true: a.) The diode is replaced with either an open or a short circuit é) The diode is replaced with a battery plus a short circuit or open circuit :) The diode has a small non-zero leakage current flowing in reverse bias d.) The diode has an offset voltage equal to the built in voltage of the diode e.) None of the above. 2.) (S-points) The series resistance of a diode, 1... -tesults from the high resistance of the depletion region. -Fesults from the resistance of the quasi neutral region 3.) (S5-points) Which of the following bias diagrams is consistent with forward bias (all three diagrams must be correct, i.e. the schematic symbols, energy band diagrams and the material drawing must have the correct polarity)? a} p-type metype n-type +) Vt n-type p-type (4 Section - 40%) Pulling all the concepts together for a useful purpose: 7.) (40-points) Given the following amplifier circuit and BJT Parameters, what is the AC voltage gain, VoutAC/VinAC? Assume: Bpc=100, Early voltage is infinite, turn on voltages for all forward biased junctions are 0.7 V. You may assume all capacitors are very large values and are thus, AC shorts. Additionally consider the circuit to be operated at low frequencies where you can neglect all small signal capacitances. Also, neglect all resistances that result from quasi-neutral regions. Ts.“ 4: le-isA 4, 190% 4,3 yO 4 bEeV Al righ We fore (3,0 Tw A) 500 = Farure, JS actin verse dt Vg ove + Veo Vu Extra work can be done here, but clearly indicate with problem you are solving. D beat pom mo _ BIT Vaede ~ % 4 _ -1 vig de Gre. Co (eR oae =~ OF04E S ce bet Vs 0.0254 d= ad ao -Ts - a rar 2 We 2 4s R = GT PO ge 9.baHe ~ 6.01307 = 3D ry = Vaives 2 OtMee ° Te Lena oo AL AC Small Sis Aad f Con vero be Pex Rs a) ” ~ } aia 'S Selle £7 Gilg ll ae Poi / Kut 9g 2 rat) “be (v gm VBE — HIF Aah = osm a [ 2@ SY fe i ; r Nye Acy [aren [Wh A, = Gute = Rents (ae (SS Vin Al Nee ay " @ @ @ Maat AG Term b) Avuaae: = 9m MB (4442) =» Woe = oO = ' ¥ ler 2.) Aah = ab (99322) Vee + ae Re Unere) Wee ; oa. m7 (4922) + ee + (BE 4 gm be) Re Vath =  Extra work can be done here, but clearly indicate with problem you are solving. Vee Vo —— Ten sas fl, < Ak a \ + Gap 2 )&e = 0.0117 V/V Terme 3) ary. = G69 Wintec Var _ pega viv Ain fe