{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

HW8sol10 - ECE2280 Homework#8 Spring 2010 l(a Assume the...

Info icon This preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
Image of page 3

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

View Full Document Right Arrow Icon
Image of page 4
Image of page 5

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

View Full Document Right Arrow Icon
Image of page 6
Image of page 7

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

View Full Document Right Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ECE2280 Homework #8 Spring 2010 l. (a) Assume the transistors below have a finite fl and an infinite Earl equivalent circuit (hybrid-7t or model T) (b) Write an expression for the input resistance Rm in the circuit shown. Your expression should include only real resistances (R1, R2, R3, R4, or a subset of these) and possibly 3, 1121 or rm, and reg or rug. transistors have the same fl.) Circle your answer. y voltage. Draw the small signal (Assume all dock (Familiar 4%?“ bag“ ' 7 52 {am am a: (pa-H) we! Vii. (W R4 59ml- V‘m + Makfiaqtfinmlrfls ‘ Q5” -vcc 2. (a) Use the circuit shown below. Assume all transistors are active and are the same and have a finite B and an infinite Early voltage. Draw the small signal equivalent circuit. (b) Write an expression for the input resistance Rm in the circuit shown below. Your expression should include only real resistances (R1, R2, R3, R4, R5,R6,RG1,R62 or a subset of these) and possibly 3, re, or rn. +VCC 3 U39: ignore r0, ngEH). 7, B=100 ; (a) Solve for the DC currents: VI= 20+!) 001sinf20t) For DC analysis, assume that the capacitors are open a. 13 b. IE 0- Io _. (b) Solve for the DC voltages: _ ': 1x a. VB 7 100m- 3 "'~-.'—" b. V5 V1 - ' c. VI, '=.=‘ (c) What reginn ofoperation is this transistor acting? Ad‘iVfi W7V3>VE (d) Sketch the tOtal instantaneous waveform observed for 14: 1f EC} 3)1,1{L{>;I the AC amplification ls Vo/VFSV/V } , 3.77am QWPRUWW‘E mesgh fim‘m“ * (: +:i:(<so.<g)m ~2+~ 125*stle 3 (Mfg ~76 +14%“) Iggy) fig 8 * .7 :qu'E: %C7.Cflmfl)“ “M 7¢075m ”CotléCq‘éo‘Z) V5 “Liam 7626s v3 (3:74 +0.7 $34333 Wm ,EGQQDTSO V0 é V: 56%;) Egg +0 OOKQHCZOQBZ 5mSmC‘20rt) Va‘i- {mo TOZmCiGOB‘q [3C4 Backté 1/95. IK’IIII; SMASMCZOQI W flmm 2 WW Kim; ‘5‘“ ’aWIdkaQfla “x "Wimu , ¥ “a“ Fflmflfllmmmmmmmf "\- (flfifiwfmfiemm j a. In « b. k fl- is (BMwfixfiuDtha-m %5 Va #135 G. V. (clmwwwmsmwmmmm ' ¥ mtg; “Ra: mimfiarmminill’mfi}? - “ (fiMnfinMfl—W , Whiz” menu »- , fl “Humans! Ixi 44% 11% @5133 u- a g , i a!» , {we} 5: a: gfijméiwginfmfi 5. Use: ignore r0, IVBEI=0.7, [3:100 VI = 10+0.002$in(20t) ru1=l, 200 gm2=25mA/V, and 132:6.25uA For the following hybrid-1t equivalent circuit below, find the following values: (a) Rm (input resistance —ignore only the input source, Vsig and include all resistors at the base) (b) Rout (output resistance—include all resistors at the collector{no load is connected}) (c) midband gain, VV‘? l S g 2k 3k§2 le VO + + a T152 31:9 2kg Vsi ‘ch1 1" n1 V112 g 2M9 _ gmlv’” - WV"? Rm 7 Rin T 4kg 4kg m memman) it Hi! 1— {waimwtm = “H 311% 1:- 1Lnn+ fulfil—M: 303 QLOMJL j...— ”C‘ Ar" you}? flash}; {3” 1‘“ Um} in“ : lkfitiKi-EK‘J -; 1w: like; 7 , “(mt/era” in branch {L} . . V (31063 ‘m [Wlmg .: autumn!) 333‘} gwmciGgM : é - 5w _ _ V11: “gmgVfi1£?KL};‘gmtVfi1L an; )3 "amivfiikk LEM )- I 11-603 finflVfii , \f5— mei - , . , ‘51 t W a. Dififlfififilfifl‘lvs * H“ 1” fififii‘leg—HWLKLHJD *3 Lute-+13 = E H39 .. . _ 9m: l-m t ”ETD " 0' 93:53 a a .13. LLEm'JUK) Git—00E? [32ml Lo,oa§1¢ 151:: ll VSEE) = aargeeafitfi‘! V51; "3 mi} » g f; is 6. Use: ignore r0, IVBE|=0,7, [3:100 35% Fifi 2m _ VI = 5+0.0018in(500t) , 1,, fi- _ ,- 7‘" .; m -Man ‘3‘- rm=2, 000 gmz=50mA/V, and IBZ=12.5|1A {is} .135“; ‘im gfiifié For the following hybrid-7t equivalent circuit below, find the following values: (a) Rm (input resistance —ignore only the input source, Vsig and include all resistors at the base) (b) Rout (output resistance—include all resistors at the collector{no load is connected}) (0) midband gain, _Vo_ Vsig 2k 3kg 2kg Vo 1kQ 3k§2 am we airlltmmiilég , fies fibrzsrttjtlramar, ear? is; ~ @53- , _ 3 3 swam? “3:?“ LEE" “as? «gmfiaaiéfif 31M: 3-; new ,3 as a 2 “my“; a “is; ’3 :FBméfirz‘Efia 2' ”We {Ear-Wan ”WRITE-i “‘4’ “3* “w". 1: «Ira; .m a ‘x‘wwflmmwgmn x m t .,_ 1 . 411,} , ‘25 g E a”: :1» icebercexqaalmfilfiafg as; 2%: arm-ear i4: 1* g 7. For the circuit shown below, draw the AC small—signal equivalent circuit(use hybrid-7t or model T). Make sure that everything is labeled in terms of the transistor number. (e. g. gml, 12,52, etc.). Include r0 for all transistors. vsig=O.0013in(10t) AC. Assume all capacitors are shorted. THSV ESL ‘1' “xi Bil” _. § 100m -. Vsig . , Q2N3904 -15V j 8. Use: gm=5n1A/V, [3:50, ignore r0. What frequency pole value does C1 create? (express the answer in rad/sec.) +DV W: 9. Use: m=2mA/V, :40, i nore re. a» 533:; g [3 g T4; " 3% gm «*5 ‘5“ What frequency pole value does C1 create? (express the answer in rad/sec.) HSV . “‘ 10. (a) IVBEI=0.7, B=100, ignore rm, vsig ={2+0.013in(wt)}Volts. Assume that the capacitor acts as an open for DC operation and short for AC operation. Does this circuit operate as a linear AC amplifier? If so, what is the gain, £1.0— , of the following circuit? If not, explain why. szg +3 — tK(Ia}—9.'\=o IQ: Jiflili E. LEBMA ' lama = \00 Whirl-.3 (LR-31A V5: ~1;c\\0+5= ‘3 - lawmn) = 0.11 V510 Vfivt = finite) HM = \0.“ '40 LII-HF Mt- Vc, > V9"? V6 6H- >DJ1 ‘20 L-) hcbwt Va _ 3mg _ ’ ' 7 ‘ / ”In EEC--3 m u“; [m j a a K82, TWE- unfit, wailing? mfi?‘3*f Lcnmuse Vu=D so Visit}; ' x , L i.‘ I ‘1 y“ _ _ w DC ‘5‘»! SQML Wt c. writ l EL Madfii ‘ (b) IVBEI=0.7, [3:99; ignore rm, vsig ={2+1usin(wt)}Volts. Assume that the capacitor acts as an open for DC operation and short for AC operation. Does this circuit operate as a linear AC amplifier? If so, What is the V0 gain, V—— , of the following circuit? If not, explain why. szg _ VB; Off gfiifiiQ ‘7 fig, 20:? > Var“ O :4?er?? , V” Remit: ”11 ° W '3 W» '12.; $1.33?“ qq (1!ng OFELX“ at x :3 web *5- ‘3“ Hi, , m «i! M; {9% LC ‘ I r» a: ‘51! 2,1131) mQS , ’ 3)qu V. “9%; £3551 “ ”2}..qu ;§,%m L ) 3m“ fir at V1» 5 VT @531 “It _ 3gb ‘153g4m % ’ 3““ if" QSm' .. ‘ 5 \Y/EB : 35:15am (bk): flew 2%, Want T“ 940 ”50%”th Eve is eh“ ‘3. Use: ignore 1‘0,IVBEI=0.7, B=100 VI = 20+0.001sin(20t) For DC analysis, assume that the capacitors are open (a) Solve for the DC currents: a. 113 b. IE C. IC (b) Solve for the DC voltages: 100 i ~> . E \ N K _. r r 4, C. V0 .1:- IE (c) What region of operation is this transistor acting? ACHV’C VA>VB>VE ((1) Sketch the total instantaneous waveform observed for Ic ifi 0] {5) [$le the AC amplification is Vo/V1=5V/V. I out folding 0; \oqplimmbase wavgh WWW: 4%) +Ig(%0.%) +051 —2* Islbk—Jrgg :0 , if : (Mfg ~76 ”VIE {95099 + 34% 65 ij @030): 703 ”573%; $11000}th “Val: , ,. ,i/j‘: v v to» 7.02m0003'figv (L V0: 50/1): :Wge‘ +o.Oc(S‘m(20tBBcBmSWZO’C) mama 0‘7 02N3904 = VE :Rout ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern