Final_2010 - Eon—255 FINAL EXAM May/3/2010 Name: (Please...

Info iconThis preview shows pages 1–21. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 12
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 14
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 16
Background image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 18
Background image of page 19

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 20
Background image of page 21
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Eon—255 FINAL EXAM May/3/2010 Name: (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. NOTE: Choose the answer that is closest to what you have calculated; many answers are rounded to the first non-decimal point EOE-255, Final Sp 210 page 2 1. What is V0 in the circuit shown below, for the diode assume Von%0.7V and RD=500£2 (2) -5V (3)0V (4)4.3V (5) Open circuit (6) None of these \o _ o? ' ID a; :- O—gg é MA My? V0 1. Oh ggGQMH? : 3.86 V ESE—255, Final Sp 210 page 3 2. In a power supply using full bridge rectifier, one can reduce the ripple voltage by (1) Decreasing the input frequency 2 Increasing the filter capacitor value and decreasing the input frequency ncreasing the filter capacitor value and increasing the input frequency (4) Decreasing the filter capacitor value (5) Using Schottky diodes (6) None of the above EOE-255, Final Sp 210 page 4 3. What is V0? for the diode Is=10'14A (Assume VT=25mV) IOkQ .. 1 v0 * 5V T R2 1 0.7 3 061V ' “r g E4;0:7V ‘Lr‘fi 2 f 3 0T “A (5) av 23 (6) None of the above ECE-ZSS, Final Sp 210 page 5 - 4. For the circuit shown below, if a sinusoidal wave is applied to the input, which one 'of the curves is the output voltage? (Von=0.7V, Vz=3V) 10k Vin . Vout I DZ] V V =10V o " D22 V t t“ ":2" ' Vout Vout (1) 3.7V (2) 0.7V t t V0 t VON; ' 6V (4) 3.7V _ . t _'6V t -3.7V 1.4V , @ -6V- (6) None of these ESE-255, Final Sp 210 page 6 5. The circuit shown below is a ' I 1) Two input AND'gate ( I n I I ' gate (3) Two input NAND gate (4) Two input NOR gate (5) Two input XOR gate (6) None of the above ECE-255, Final Sp 210 page 7 6. For the circuit shown below what is the value of BF=50? Assume for transistor VBE(on):0.7V. For Zener diode Vz=6V, RZ=0, Ig=10"6A, I +15V ——-—§ IB=22.1uA DO 'Zener diode 4.7 k!) (1) 100 _ (2) 80 . _ l (3) 75 . (6) None of the above ‘ J _ BCE—ZSS, Final Sp 210 page 8 7. For the bi olar circuit shown below, VCE=? B=1oo,: 15:10' 4A, and VT=25mV VCCZS V f 100% VEE= -9V (1)14V . (2:1? (5) 4.42 ( ) . one of the above (3) 0.7V (4) 5V ECE-ZSS, Final Sp 210 page 9 ‘ 8. The circuit shown below can be used to measure the ionizing radiation (X rays and v rays). The FET is called a RADFET and its threshold voltage is a function of the amount of radiation. What is the MOSFET threshold voltage if V0 is meaSured to be 1.5V. (10 Points) Assume KN=0.1 rnA/V2 VDD=5V v—Ray V0 0.2mA - (1) -1V ‘ (2) 2V (3) -5V (4) 3V (5) 1.5V (6) None of the above S- ari-T :: 3-3 EOE-255, Final Sp 210 page 10 t 9. For the circuit shown below V/gisume OpAmp is ideal and B=40 +15V (1) 5V (2) 10V (3) -5V (4) -10V (5) ~0.7V (6) None of the above U03l019‘ ‘—'_l VC‘ “‘0 fl? EOE-255, Final Sp 210 page 11 10. Find the output voltage (V0) for the circuit shown below, VTN=0.75V, K N=100uA/V2, (wm)1=(W/L)2=10/1 ' 3x; -- - Mg, (2) 135V _ (3) 0V since both MOSFETS have their gate and drain shorted (4) 7.8V ' .' (5) it is open circuit (6) None of the above Z 113-: < (VGVVH l. . L are: 0 ‘ “a (VGS-O?;T) ECE-ZSS, Final Sp 210 page 12 11. What is the configuration of the multi-stage amplifier shown below? +V supply .. magnum; ‘ (1) CE-CE-CC - ".(2)'CE—CC-CE (3) CE-CEfCE (4) CE-CC-CC W -- ' (6) None of the above ECE-ZSS, Final Sp 210 page 13 12. Figure below is internal structure of an OpAmp, what is the common mode gain of the first stage (|Adm|)? Assume identical transistors for differential pairs, B=100, VA=100V, and VBE(ON)=0.7V +159 : R2=2o kn _ ' : RE 20 m Ragakn ‘ R. 2.3 m Q: Q Q; sir Um} I c U.) 4X R; 2 15.? k0 R5 : 3 kfl' ” 715V: -. (1) 200 (2) 125 (3) 400 (5) 12 7(6) NOne of the above mama K: 20 n a, u m My ‘ 6-25” l 0-17 a” .. 25-qu Y VT 0 02? H Zfoofi 2’2 ECE-ZSS, Final Sp 210 page 14 13. What is the common mode gain (IAcml) for the circuit shown below? RC: I, RC: IUOkQ 100m Vout O__— V! '92- —5_V (1)50 (2)0 _ I (3)1 (4)0.25 (5)0.58 (6) None of the above ECE-255, Fina! Sp 210 page 15 14. For the emitter-follower shown below, what is Rm? Assume BflOO, VBE(0n)=0.7, VA=00, VT=25mV 7 3 k9 + 3’; "“‘ 20 “A , Rf". _ (1) 1.25m ' (2) 800m (3) 489 (4) 480m (5) 5009 (6) None of the above I ‘ ,_ 0.02": mawfl‘ 3 a; W4 ECE-ZSS, Final Sp 210 page 16 15. What is the output impedance of the following multi-stage amplifier? Assume the following parameters and small signal parameters for the transistors, m slStorParam’te'rs‘Tl’H51"; ; m, ~ ‘ 5K";1°'W2"Vfiiifii—3MI Q10 v:- _geefir-.—-, :150. vi ; aqv. grin; _ _ - ‘ -fir.-e380»-Vaj' ‘-69,-:W=Véér='-0-1. .4- 1 (1)' «60!! (2) ~3.3kQ (3) ~33kfl ‘ (4) ~120§2 (5) 12509 ne of the above I K (41.?ll§q~2ill2ollQ\)—fi \ _ amt :. ECE—ZSS, Final Sp 210 page 17 16. What is the Mid-band gain (|Amid|) of the following amplifier? V+=5V, Q0, Q1, and Q2 are identical and have the following parameters, [#100, VBE(0n)=O.7, VA=100, VT :_ o. 0 L? V4- (1) 1000 4 @D (3) 4000 (4) 500 (5) 250 (6) None of the above -. H - ' 0mm '3 A? Z 0 _X {Mafia 3 5 2000 '** .39 L. o-oar ECE-ZSS, Final‘ Sp 210 page 18 17. For an amplifier, the high frequency gain transfer function is given by _ 2.5x10‘°(s+2x105) AH (S) _ (s+105)(s+108) Mid-band gain (Amid) and higher cutoff frequency ((DH) are? Assume diminant pole approximation when trying to find em I (1)Amid=500 w =108rad/s (2) Amid=250, wH=105 rad/s (3) Amid=2.5x10m mflzms rad/s _ ((4 rrW500, mu=10~ rad/s )Amid=2.5x1010, coH'=108 rad/s h"x(6)-Nene9£1h ' 7 _ f A I ‘0 é leoq (H a (For) QM“: 3-7906 [a V 2008 (H {:gM‘r ECE-255, Final Sp 2l0 page 19 18. For the amplifier circuit shown below, find fH? (1) ~106MHZ (2) ~15MHz (3) ~35MHz (4) ~50MHz (5) ~2‘MHz (6) None of the above w / /:f; m A Zf/VHHE WXEaa KZT-fM/o EOE-255, Final Sp 210 page 20 19. What is the lower cutoff frequency (fL) of the common emitter amplifier shown below? Assume l3=100, VBE(on)——-o.7, VA=oo V+=12V. I , (1) ~0.016Hz _ _ _"(_2')'~511_z ' ' . - (3) ~0.3Hz (4) ~50Hz (5) ~1Hz ' ne of the above H5? 10/? - . _ _ IWJJ r _ VT : \Mam Lyon/1213} .J' i % n I; 15) Hgsugé Z “7/ ‘ \flxl \JVL aw”! Z 221?. + [add 3 31‘1 f .m/ ECE-ZSS, Final Sp 210 page 21 20. The short circuit time constant associated with CgS in the common source. amplifier shown below is? (Assume Cgs=10pF) - _ (1) ~2.53 (2) ~5n's_;-.' I (4) ~10us (5) ~1ns (6) None; r _ .. 0—9 I m (I 7 ...
View Full Document

This note was uploaded on 01/12/2012 for the course ECE 255 taught by Professor Staff during the Fall '08 term at Purdue University.

Page1 / 21

Final_2010 - Eon—255 FINAL EXAM May/3/2010 Name: (Please...

This preview shows document pages 1 - 21. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online