{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

quiz3_2001_soln

# quiz3_2001_soln - Rensselaer Polytechnic Institute...

This preview shows pages 1–10. Sign up to view the full content.

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

View Full Document

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

View Full Document

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

View Full Document

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

View Full Document

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Rensselaer Polytechnic Institute Department of Electrical, Computer and Systems Engineering ECSE-ZOSO Spring 2001 Quiz 111 Print your name on every page and show all work to ensure partial credit. Problem 1 (25 points) Problem 2 (25 points) Problem 3 (25 points) Problem 4 (25 points) Total Name Problem 1:, Consider the multistage ampliﬁer shown below. +30V £5 : I00 1955: ISLmFl aEOk VP: —3\/ ob 1—H Ca , om ML 1; 1°=5mﬁ J 1;: a eS’mA \O\4.JL. 00 Q3 96 WH Q3. 1 + t/<3 Vt - lock-CL: taut oe ak‘ﬁ— 504 @ a) Identify ampliﬁer type for each stage (e.g. common emitter, common gate, etc) and indicate the type on the schematic diagram above. (92;) b) Determine the mid-frequency voltage gain for the whole ampliﬁer, vo/vt. Show your steps clearly to maximize partial credit. SM dab Mid w m Auto Mm cc: (WQOWQMQ _ to! (Amuse) A : a akusé " PW + (who «cued “rt “3“ B i too ‘ = #465“ = .373. , Gr: ,3» ‘ \$14912. 08'“ a5}! i {:3 ® (9 RC3: rrr + (t+cs.)(ak.uso\ .—; Silas/q; WW 7 v 7 Wm» _,_ CG- '— Cs: Name : Av: cngCliluKL) = 1m (akllS.HC/<) % a f A (QM: JV 12:: (low 7' “9(Bzrm36’m ,OOSIG N "75 AVA: (- Oosmxﬂqqx“ = \7.‘Ié ® A4.— -?M (RDHLL) ; 'ij‘N) :—( .oo (33 Kg: I®I<1l>>[email protected] — _ ezru'K , H. - 2 . 373 -: C3) 10K+¢°?.7>‘K. q) A =(.8'B)(—D(7Ve)(.‘i</E) r- @ 1 Name Problem 2: ' The circuit below features an enhancement n-channel MOSFET that is biased with ID = lmA. +aov R‘HK3= IH.Q_ ‘0‘“2- k ’ W/;_ = H mA /v* Q; l—‘T—c V : IV J Immlo + vo T + EIOKJL C35:3PP C34=4PF @ a) Determine the mid—frequency voltage gain, vo/vt. m 3 W1 7\Jé~CVmA/v})(lm4) Vie Wm 5W g b 4 %Z : ‘thUokquY: 3' :— “3.858) a 71%.! > K (9+ c) (—13: ‘KI’HZA = N7 lH‘f'fCll/IC} lH-HM ”5” ‘7') V%¢ ‘Cv§)(-N.I) =- Q03 b) Determine the capacitor values to produce a lower 3 dB frequency of 5 Hz. Cm: 2%:H44'N’1‘QV] +’ .—. -—J-— ’5” a) = ’ q : C3) 553 377(>H)(<‘ -5H? (<1 /s. m Name CC}: Raﬁ = tots 4- tok=>OK I’hMﬁM—bi C43¢¢oLW 69 lo , ganged (2° (5:1); F - ’A C? (C;‘ /3’.q/L~F (C’215’9nfr; .IS'Ci/kF Ll/O) c) Determine the upper 3 dB frequency for the ampliﬁer. Name K-( -—/s‘( _ C ‘ ‘ ————' F) .3 H 28 ta K «36'» —/‘/.I (“If 3 E91: IOKHIOK. = SK Q’QJSKKQJJF) : Jcﬂxw"? C7) ”'21“ ‘53de ’1'“ : flu-r? (if) Name Problem 3: I The circuit below uses shunt-shunt feedback. 0? 0mg ”lament/reruns IONIC. a? a) Use feedback analysis to ﬁnd the gain of the ampliﬁer, vo/vs, when the op amp has the parameters listed above. Show your analysis of the feedback network and the modiﬁed for- ward amplifer as part of your solution. Hint: perform a Thevenin to Norton conversion to make the input a current source with a parallel resistance rather than a voltage source with a series resistance (to match our earlier work with shunt-shunt ampliﬁers). Reverse the process at the end to get the voltage gain from the trans—resistance. Name 4 4 IOKﬂgo a k , (moon/a) -— Hm VAL Jere-r/oK/ls‘zs _U& : LS (Slgll IOKIHH) = 65 (3.33K) (9 g) V443 :{lqi,;)(3.33/<) ; e44: KJL— Cu—kk ME OR l/ \ “éélK ‘ ‘ ¢ O/C" .J— ' ~4,85'kJL £1?) (E) b) Assume that the operational ampliﬁer has a DC gain of 1000 and poles at 100 Hz, 200 kHz and 5 MHz. Determine whether the ampliﬁer is stable with a feedback factor of 0.01. "4’ .lf _ 1‘: :2! 44¢” ’WTJT ' ML 41¢??? “ ”3° .6le“?- l I' W = 1.9“”4“ S‘l’kfaLE Problem 4: , Name Consider the differential ampliﬁer circuit shown below. -r 10V 3‘3' 3km. BC (Welt-hang (/0 I‘\:I<a_:.§mlq Va \ 1 l g Q “’Vx Emmi Small ‘Darwel-«s “ 0.03. HIV IMHL 1mA Ci“ FT), t. i0Kﬂ. -~aov ‘ 300 3) Find the differential gain, Ad = vo/vd. £2. )- N& ‘1' ‘gm (3“ "éo ““93. Mo 9' )- @ Name c) Assume that Ad = 30 and Acm = -0.1 (they don’t!). Find the small signal output voltage, v0, when v1 = 0.1 V and V2 = 0.075 V. Val: M‘V‘,= ./".¢75‘: ,0): (8 lg: PM“). = ‘/+.o7r:’0875- C3) >- LI *9 = M Na + Am ”c = 30 Cox) + c—. 044375”) 6) =- 10 ...
View Full Document

{[ snackBarMessage ]}