Exam_09_03

Exam_09_03 - ECE—ZSS Exam 111 April/ 1 3/2009 f“ 3% K...

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Unformatted text preview: ECE—ZSS Exam 111 April/ 1 3/2009 f“ 3% K “a Name: i (Please print clearly) Student ID: INSTRUCTIONS This is a closed book, closed notes exam. Carefully mark your multiple choice answers on the scantron form. Work on multiple choice problems and marked answers in the test booklet will not be graded. Nothing is to be on the seat beside you. When the exam ends, all writing is to stop. This is not negotiable. No writing while turning in the exam/scantron or risk an F in the exam. All students are expected to abide by the customary ethical standards of the university, i.e., your answers must reflect only your own knowledge and reasoning ability. As a reminder, at the very minimum, cheating will result in a zero on the exam and possibly an F in the course. Communicating with any of your classmates, in any language, by any means, for any reason, at any time between the official start of the exam and the official end of the exam is grounds for immediate ejection from the exam site and loss of all credit for this exercise. Perform all calculations to two decimal points ECE-255, Ex 1 Sp 09 page 2 1) What is the configuration of the multi—stage amplifier shown below? N) N) 59%”? in} , V+ 1H . {j 5W“ W? e. L fl 5‘} rflfi 9 {f’w’ (1) CC-CE-CE U2)’/6C-CE-CC (3) CE—CE-CC (4) CE—CE-CE (5) CB—CE—CC (6) None of the above ECE—ZSS, Ex 1 Sp 09 page 3 2) F or the circuit shown below RF? (Bias currents for Q2 and Q3 are indicated on the Figure) Assume 8:100, VA=00, VBE (on)=0.7V, VTZZSmA. (Assume owl) 13511:”"v ‘ t. (i. a gig”; V+ V+ IN a, 5x3 ' (1) z gvgoko (2) m SkQ (3) z 250m (4) z 15ng V (6) None of the above 6 s (7” 9%; File? A (:fiwn owwg’? if: ‘” ’i‘ ECE-ZSS, Ex 1 Sp 09 page 4 é Vé) What is the overall gain (VD/Vin) for the two stage amplifier shown below? IC2=6mA and IglzlmA, Assume [3:100, VA=00, VBE0n=O.7V Vin (l)~-l68 (2)~ 14 @51320 (4) ~l (5) ~2352 (6) None of the above .0 V “9" W2 3% M U3 ‘~» fl", ECE-255) Ex 1 Sp 09 page 5 4) For the differential amplifier shown below, what is the tail current (10) and output impedance (R0) of the current mirror?? Assume [3:00 (i.e., ignore base currents in Q3 and Q4), VA=80V, VBEOH=O.7V. Assume Q3 and Q4 are identical. 10V l9.3k§2 —lOV (l) lo¢§ll*mA, Ro=oo /(2«)*"Ilo=1mA, R0=80kfl . (3) 10:0.47mA,Ro=40kQ I f» I p ,, . ly/ g t ; I EMA #543 (4)Io=lmA,Ro=40kQ 5 tr (it »~ ~ (5) Io=2mA, Ro=oo V a , (6) None of the above 5 i ECE-ZSS, Ex 1 Sp 09 page 6 For the differential amplifier shown below, what is the common-mode gain if Io=1mA and W RC1=RC2=101<Q? Assume 3:00, VBE(ON)=0.7V, VA=100V ' I, V6) 0.05 (2) 0 <3) 1 (4) 0.1 (5) oo (6) None of the above a y i FEE-255,1? 1 Sp 09 page 7 What is the common—mode gain for the circuit shown below? (use the half circuit model) RC: RC: 100 kg 100 kfl (1) (2) 0.02 (3) 1 (4) 25 (3/058 (6) None of the above 33 l} M g i A" ‘25 v ‘ ‘ s W1 5" fly] New, "NM NM“ : ECE-ZSS, Ex 1 Sp 09 page 8 7) What is the configuration of the multi—stage amplifier shown below? (1) CE—CE-CB (2) CE-CB—CE (3) CE-CE—CC (4);),ef—CB—CB (5) CC—CB-CB (6) None ofthe above ECE-ZSS, EX 1 Sp 09 page 9 8) For the amplifier shown below known as double cascade, what is the gain |AV|? All transistors are identical. Note since Ici=1c2=1c3, therefore gmi=gmz=gm3, r01=roz=r03, rm: Tm: rm Assume ro>>re /t, x/ 3 3 2 2 L/(l) gmro (2) gm r0 (3) 1 (4) gm r0 (5) ger/r7E (6) None of the above k/ ECE-QJSS, Ex 1 Sp 09 page 10 /9”/) For the common gate amplifier shown below, what is the overall gain (Vo/Vi)? Assume Vm=1V, Kn=3mA/V2, and X=0 RL = 4 k9 :- Q (1) Gainzl (2) Gain=9~8 (3) Gain=22 (4) Gain=5_55 (5) Gainzgg (6) None of the above g 2:" ECE—255, Ex I Sp 09 page 11 10) Figure below is internal structure of an OpAmp, What is the current ICQl? Assume Q1 and Q2 are identical, B=100, and VBE(ON)=0.7V +25 v 132 2:: 2:3 m .: “is . > * - 23.3 n R; 2) 1 163mm 1 R‘ k ICQll : ' I Q? 9;; QS ......... .. . Q: «12* “I’M :1 2836M} Q Q Q3 4X Rf, 35.7 m ’36 3 m bZS V (1) 0.5mA (2) ()mA i"W(3I)>fl0§5mA (4) 0.27mA (5) lmA (6) None Of the above ...
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Exam_09_03 - ECE—ZSS Exam 111 April/ 1 3/2009 f“ 3% K...

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