ECE 351 Final Exam Spring 08 - Solution

ECE 351 Final Exam Spring 08 - Solution - ECE 351 Final...

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Unformatted text preview: ECE 351 Final Exam Spring 2008 Name Sore So‘krt tcx‘h Section 1 CM 12/3 Scores: 1) 30 2) as 3) 30, 4X1: Total I pledge on my honor that I did not copy any of this exam, and that this work is entirely my own. Furthermore, I did not use PSpice during this exam, except for the lab quiz. Page 1 of 9 Problem 1 (30 Points): a) Find a numerical value for V0 if 11 is a 100 uA DC current source, and 12 and 13 are 1.2 mA current sources. (10 Points) b) Assuming bias currents of 150 nA, find a numerical value for V0 due to bias currents. (10 Points) 0) Assuming that a = 10 Hz and A0 = 3 MHZ, find the upper -3dB bandwidth for this circuit. (10 Points) Q} (\(P :. “LL K H321 :lefixitowho‘g: (9U \Jm - - 1 +19, 6:9 \CLWN‘) ~ ———- «oqu +934", \.\N\Q ’ ‘0‘ ‘0‘ 1;: \lo HM —. 1"“: =5 um i:- “Amstsm T5: “r ' {at v I E29. 4' SEN «Vb \lwx’ 1 Q as (N: :13 gas.) wiry E3 Q15; \i?’ M 7, £3 RN BRQS LUKYMJ<§£ EpMQWCBQbf ®<C¢9§ .5 :1 :6: to some CKT f0 %€(53 ‘31) 5“ Z” 3 RQ3QIHQL 5' Sit) Rm: r PagCZOfg 36mg. Refiam 7; 03:0 Chg *0 %x%m Page 3 of 9 Problem 2: 125 Points) ldeal_OPAMP + + "V3 To — V1 loc=3 _’ DC=2 :0 —?—0 Assume that the OPAMP output has limits of $15 V and that the diode is ideal. a) Sketch the transfer curve V0 versus Vin. (5 Points) b) Find a numerical value for the upper trigger point. (10 Points) c) Find a numerical Value for the lower trigger point. (10 Points) Non~ woepéwlé Was Tame do \)0 “Cd” 3 V») A 5/ Page 4 of 9 \70 Rzlikz REM?) U\ Q1) ) 2) (0/??ng \)\~J -\a Q\ ‘i 27vng (27,“: fijflfizx 23 + £7) “2“ \ : -\S~JYT3 —r Vwi W49 “Jr dLU( (L4,? 3 20613 ‘\ ieé’jf‘ZOOex ‘5”‘Bé ~+ \de(o.qst{3\ Aroflom \Cor «(Lg L195 do; +6 61> SDon 30735? ., \ \) a «Y‘Mggd (\r’P’ELE‘V’ €¢Y>.y\ 7, 9; W"&« =i> 33“ W W” \JN A“ 5,3Q “~43 ‘6?! L‘Yy'sflwfi‘MJ / av Page 5 of9 Problem 3: (20 Points! R21 50k The specifications for the OPAMP in the circuit above are: 0 V10=l HIV 0 13 = 100 nA o A0= 1 MHz (Unity gain bandwidth) 0 VCC = 15 V o Vee == 15 V a) Find the gain VWm. (10 points) b) Add resistor(s) to the circuit to eliminate the output due to bias currents. The added elements should not change the gain. (10 Points) QB \lo 3 \)0\ “U074 Page 6 of 9 n 0 Problem 4: 125 Points} A 245v Zenerfl vxv Z‘ S K, up 1 so Find a numerical value for the current I. (25 Points) “1"(U’VZ‘S) 30 13 M3,: tel/Mir KL Z98 Y\I\(\./ g Page 8 of 9 ...
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ECE 351 Final Exam Spring 08 - Solution - ECE 351 Final...

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