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Unformatted text preview: I“ Name SoLu flows Rensselaer Polytechnic Institute
Department of Electrical, Computer and Systems Engineering ECSE-ZOSO Spring 2003 Quiz 3 Print your name on every page and show all work to ensure partial credit. Problem 1 (40 points)
Problem 2 (30 points) Problem 3 (30 points) Total Name SOL L» 1'! ou§ Problem 1: ' Consider the multistage amplifier shown below. The parameters for the devices and DC bias currents are shown on the diagram.
-r LS" V [is k’WIL.= m. nan/V; V = H/
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C 12.5.0F WI \awvéis a) Determine the mid-frequency voltage gain for the whole amplifier, vo/vs. Note that the DC
bias currents are indicated on the diagram. Show your steps clearly to maximize partial credit. I; lMA -
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clearly to maximize partial credit. CS : C = lid/L”
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lr‘ lil’ N\ “Mt «We ' c) Assume that you are able to adjust the value of one capacitor to improve (lower) the lower 3
dB frequency. Based on your results for (b), which capacitor value should you change and in
what direction to get the most improvement? Cewmm‘i‘4‘fidflmwffl . z Name Jaw; c) Estimate the upper 3 dB frequency for the amplifier. Again, show your steps clearly to max— Fau—Ls. 311', “(1' * CmHquv “TC (“+6 3
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‘ckg JTrZ‘rL" Problem 2: Consider the differential amplifier drawn below. 2,5 W =_ m m b) Find the common—mode gain, Ac WWW dd M‘me wak‘lmw widen. - bold
m,- “L" - m rfi-rc n+9) )(ms) M, .m, Name EaLuTlaMS 0) Assume that Ad = -40 and Ac = -0.3, find the output voltage when
v1.1 = 1.01 +2sin21t6Ot 1.09 + 2 sin21t60t No‘ A4 NM M2 = («ox-.02) + (hams nature“) ”a = 2.885 — ,stgfi'léo-é d) Assume that Rid = 5 k!) and Ric = 100 k9. Find the input cunents, ii] and iiz, when the volt-
ages in part (d) are applied. C. — NJ + Nc, + 2L'& 9““)-
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In“ M lTréO‘é 9’ Name gm. UEI l N 5 Problem 3: ' The circuit below uses series-shunt feedback. The details of the DC biasing have been omitted
and the DC current source can be assumed to be ideal. The feedback network is indicated on the diagram . ‘--—————.__J REE» mi: .451ka 2 a) Evaluate the parameters for the feedback network that are needed to analyze the circuit using
feedback analysis. a ”"V' ( 'Sotuzawzm. .4. ”K «A
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L‘\a_{ "' = '1 0V ' ‘ b) Draw a schematic for the modified forward amplifier and evaluate its gain, a. vcg "“m
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w rm + ((50%? Name 5‘de Io c) Evaluate the gain of the feedback amplifier (ie. the closed-loop gain). °~ 6a: A; W... I+Cco>x.o\«) :- d) Find the input resistance of the feedback amplifier as indicated on the diagram. (NHLWJC EB.) 2L 329/». Law SMU-CQ EC; (K4. RC‘I .7 8x35 K‘K Luv-k Mud.) E; = KL‘CHAF) = waft-l so; new)?
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