Midterm2S03 - EE 208-02 803 MIDTERM EXAM#2 Braun CLOSED...

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Unformatted text preview: EE 208-02 803 MIDTERM EXAM #2 Braun CLOSED BOOK + 1 Cheat Sheet State any assumptions and show all work. _— _ —_ (1 point) Print Your Name: 5614 L1 T/[j/Z/j _- _— —— -— No unauthorized help given or received. (I point) Signature: éfi [éifl/ FOR THE ENTIRE EXAM, UNLESS OTHERWISE SPECIFIED, USE: The CVD model for all diodes -- including breakdown diodes -- with Von = 0.7 V & VZ = 5.0 V. For FETs, 17m: — V713: 0.8 V, KN’= 100 uA/VZ, Ky: 50 uA/VZ, y = 0 v“, A = 0 V“. Show all work, state any assumptions, and test hypotheses. l. MOS Biasing (12 points) Please analyze the circuit shown to the right and determine the Q-point of the transistor. W/L = 4. \é. ' 4am gram '5 31/ , «216/ l m 1.0 #Yfl/WZS/gg sen/WWW Mtg 40 k0. Lo : é—‘e'E/leévlfl a/lz ..,;.. n I I _, 7‘5 [\2 .04? 7171/1 u/L’V .a ll/lf/fiil}(zflL_I/§—[/, V :Xbl/yfllflfl 5/ I 42 ,21/ V5 :1 Wfi’ « $290.17. 50/.vi PM 1/} H17L )7zlg -’/,4¢ 35’ V5 PM I , mfl" .. ._ 1/ Mew z 01sz Vfi ’2 2 f ’2 V5 ». . .367: " In L’ m d a231fl/ 7— l/éé - V}— : / 555’V‘ 5351/:16’55V 55’ 557-7 1/ 351/ v dry/130w“ 900,2): $57, 951/ > It — t4 : mu awry .; /, 57551/ 2. Diode Circuits EX/L/VW/ éLi/VIJV 4/7551. (6 points) A) For the circuit to the right, please sketch the output voltage when the input voltage, v5 is: VOUT Time [ms] (6 points) B)r “‘ eas e sketch equivalent circuits for the above circuit showing the 1.0110ng possible cases. 1.D,ON;D20N F0]? 15) I 5'5l/ 2.;D10N DZOFF ‘véw’ a, 01/ D} ’ Vow: V “/1 9V D1 D2 + l i + Di i VOUT + i V aw We: cm» 0W mg OUT *' R2 _ x R2,» V W *1 v 1P: 3, + . S LC: ii. 1k? S 6) ml__ 1%: i ’1 V _:::___ l I 1V Wm L— "“1"" ”r“ w 3 D,0FF; DZON VM; 15:52:», [JV/51” 4. DJOFF; DEDOFF [/qu ;§V 57V D1 F016 V65 "5 'T—TH—T T T VOUT F21 V our 1].? «L :ng g 92$ vs 6;} j: 1kg}; + 1m? 'lvwm 3. Transistor Operation B Figure 4.7 of Jaeger shows the cross section of a MOS transistor with a gate voltage of v65 and a drain voltage vDS applied. Use this figure for parts A & B. (3 points) A) Determine whether the transistor is a or a PMOS FET. [circle the appropriate word(s)] Ex l '1. . , ,, ,, , «b _ p a” ,4 Maw [/1555 4 fl we“ M/é'Zé m»?! xv: 7/79.: Jfll/xf’Zf WW7 fl/fiW/V fffl/mfi' (3 points) B) In what region does the transistor operate? [circle the appropriate answer] 4) Breakdown Explain. A/fl/fl; /5 5720/ [IV/7‘5” V5; ) [5w Va; 5mg; 4 Va; ~14 //'7flf/_/f’fi 44246414“ raw/70w w f/fl/C/V» (W: //I/ (MM/£4 M4955 [WW 4W5” ””7 ' (2 points) C) When a BI T operates in the REVERSE ACTIVE mode, [circle the appropriate word(s)} the Base-Emitter junction is ON OFF and the Base-Collector junction is OFF the termnal currents A‘s“ A u; u circle the appropriat (2 points) D) In the transport model of the BITi equations 5,13 exnres terminal current does the following expression represent. 7(1) \ 1—"- (D O y ,_ 4 p. ,_ 4 u answer] Base Current, i3 v v I v I S eXpE—Bi) — expfll) + —5 exp[i] — 1 Collector Current, iC (4 points) 4. LEDS and Photo-diodes Determine the wavelength and color light emitted by a LED having an emitting layer whose bandgap energy is 2.3 eV. 12 Afflmvoe’ V , : .. : 5’ f 1574/ } —-——/,—/ZI 3 e l , 53 7 W14 [j K 5. JFET Biasing (6 points) Please analyze the Circuit shown to the right and determine the Q—point of the transistor. Use VP = '2 V and [0.35 = 500 ”A. V45 :02/ >15” 55? 04/ mm Va»;- _ V0 r 2 L/ > Was 50 awe/W J] ' , 23955 l/ ID) I— W ' [‘Q'V” ‘3le 25%?” ' , /v\,., (.214; [0 “('29-- 5:7” ’1 01‘3‘}5’n¢é7 : 3257/2? .x ...
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