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EE 3220 Test 2

# EE 3220 Test 2 - EE3220 ‘Test 2 — Name 451‘[4a...

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Unformatted text preview: EE3220: ‘Test 2 — 4/28/06 Name 451‘ [4a dM/‘ch/ 1 Directions: This test bontains 3 problems. You have 50 minutes to complete this test. Do not spend excessive time on any one problem. Partial credit will be given for partial knowledge. Provide answers in indicated Spaces where applicable. Do not write in the table below. Graphing or storage calculators are not permitted. l l l \ _ _ — EE3220: Test 2 - 4/28/06 Name 2 1. Plot the magnitude and phase repsonse of the transfer function below. Use log axes. (20 pts) 2», G: IOO—r——1—9——-—.—— (1+ 1%)(1+ {3%)(1 + ﬁgs) .I I to M7707 M" M7“ 10’ K {7‘ EE3220: Test 2 - 4/28/06 Name 3 2. Inspect the single transistor ampliﬁer in ﬁgure 1 and answer the questions that follow. (50 pts) 10V Figure 1: Ampliﬁer (a) Describe the function of each of the capacitors in the circuit. Indicate whether they most likely model a capacitance or represent and actual capacitor in the circuit. (5 pts) <1} “55¢” Mm” m (‘6 i- {f/Id’ff (“50! Gym Cu ‘ if!“ /‘”T”'/" (b) What does Rs most likely model, and why is it important that it be failthfully modeled? (5 pts) le- ' IW’KF _..’;0'/Ien/A’Ar{ («rm-I” with” flu" fan/e: r'r/a (Pl M/My‘ (c) What limits the high frequenCy performance of this ampliﬁer? (5 pts) EE3220: Test 2 — 4/28/06 Name 4 (d) Plot the magnitude response of this ampliﬁer using a. Bode plot. You may make rea- sonable assumptions and use Thevenin methods. Assume 0'“ = 2pF, fT = 500MHz, 'r2 = 10 Q, n = 1, VA = 250, and ,30 = 100. (35 pts) ' /. ... a: 05' “4/51"” " .fe ' Alp} if“ .1: " '07“ j g C = .97.? _ m“ g f! * jtJ'W/ﬂ I. 3/]: I z/ﬂF/ f):-/7;:)/W /3"?K 4.07“: C; a/wiwér 4‘: %¢// —/I) ///= ‘fMﬂL/ (I z 722/):— (a/m amp—,- 5, I” __. Ayf/(fﬂJ/{ng 3” w c I ‘ ' ? 397(7vxfr) ‘5 {Mitzi/f4 6‘; Illa-1k ‘1’“: soﬁ’Wa ‘ ‘ ﬁii’ﬁf'ﬂﬂ/J. If,” -: 3.ar1 EE3220: Test 2 - 4/28/06 Name 5 Extra Space: MI” '50“ 64751 M, a 16-. 0. ##ka rm «ﬂay/1, my M.” ,, 7/15 .. ﬂJ/va 14'“ (a Jar were no! (“r/l“ [01?” fo‘Ii/y ’ o’Jo’ 1% /o’ Ia‘f/a’ lay/0' u a :4 u, "I am! a!” t u I I V} i (M (t/tl/l//4k 5 J37 74} ﬂit"? I'J‘ ’1‘ am. rim/z * rrrraf’nd/évx EE3220: Test 2 - 4/28/06 Name 6 3. The cascode differential ampliﬁer in ﬁgure 2 has the exact same midband differential and common mode gain as the version without current followers. Answer the following questions about the ampliﬁer. 10V Figure 2: Cascode Differential Ampliﬁer (a) What beneﬁt does one gain from adding transistors Q3 and Q4 into the normal conﬁg— ulration? Be concise. (10 pts) 43 514. ﬂ/Afﬂb/ 4' 1M4!” «ﬁﬁa/azfe ﬂ 2“! f£//t’ro‘{rrj a QIQZ ﬂak/2;"? /(c_ Mil/1’; » .60" lie/947"“! [If ecu/ea Ma’- EE3220: Tbst 2 - 4/28/06 Name 7 @@ (b) Estimate the upper -3dB limit for this ampliﬁer with and without the current followers. Assume the transverse capacitance seen from the input dominates. Also assume tran- Sistor Q3 presents an impedance of 33—1-5 to Q1. 0” = 2pF, fT = 500MHz, r: = 10 (2, 7y = 1, r0 = oo, ,60 = 100, and VBE = .7V for all transistors. (20 pts) I; =’ fan/{j jg ' .g/fl‘f’tl 6"zt?7m-9f 8 (-7,): For! a/IW' 1'6"” C M an. @ w/ (Ill/Inf 94/40!» W A :- Q/F( [42749 ctrc @ j?” / L! ‘ W a o = t /o 5" 7“” 5 ’9 m“ 1’ m «sz 137/0”. / / ‘ uﬂ'al’ﬁ‘t/ " /o(t:,;=+ 902”) Z/SM / / ﬂ 71’ ﬂ/yl ...
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