20101ee115A_1_ee115amt2sol

20101ee115A_1_ee115amt2sol - EE 115A'Winter 2010 Midterm...

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Unformatted text preview: EE 115A'Winter 2010 ' Midterm Exam #2 . Feb 25"h 2010 Instructor: Prof. M.F. Chang Name: UID: Left student’s name: So Mfofl , . .- V { Right student’s name: Problemlz Problemz: Problem3: Prabiemfic: Banug TGEE‘E: Problém 1 {25%} For the circuéts below find the indicated smali signal? resistances symbolécaliy assuming early voltage is infinite. R1 1+- Q1 I 5’2 - R' .- v5 :_ _ Rail! (b) 4‘ Ram Rs 01 ‘ + ' (C) —.-- 1/52.: .J 6‘.) QM: ? ‘f‘RQ/flf Problem 2 {25%)- For the circuits below find the indicated small signal resistances symbolically assuming early voltage is finite. £7551 (A) pf“? +<§+)C,’//Vfll§ ii; ‘1.- 1) if (a) Y+ (flfi)(:fij’ ) + m 1"“ 71 b) - 7 VB? 2 _ a gfi: tfll’a‘ lb) { Rout Va;- " Y Ami <2) i a: 5'? Rar— l ( mm mm (C) 0% 1,;ko ) r $02 A>E‘+(I%U(Vm//V Ld/J I’M i“ Q‘ i), ‘jl‘mm Fem _ \W\ ”N ' i. L . {in 'l(l%;2)('37 > (d) i m Problem 3 125%} ‘ Find the wattage gain of the following circuits, assuming eariy voitage 'is infinite‘ 1 f ' «gm ”h '6 i "i ”f a m *- ”‘2 flNM‘l W Probiem 4 {25%} Find the voltage gain and input/output impedance of the foliowing circuits assuming eariy voltage is infinite {in part a resistors are ai! of the same size R) ”i” R) z '1 .v—é’d; V1 xi ‘ 'i 3&5 ViTw‘MH «J . ' 1 éVout- _ _ ' VT:.1X6K+%%_)A+(I7+jm\i’fiX/fié‘) (a) “W: If W”! '. VT: ITKEi'W/ia )“F (EffiXI/Sf/‘izl 5%" 3:1 EWW + C iifimK/fé Jig/5 Soiution Q \[m ‘ \fm-’ “If? } W62“ '“ifliim 2" UBMC Vflflg’éUCjaflKfi ) i CHE/0m MW - Va R“? My; ”1 . a ‘ t F "F R. W‘WP /) Wk Q j ,4} .. / ,. M‘Wé LW" - BONUS [259% Find the voltage gain and input/output impedance of the following circuit assuming eariy voltage is infinite ...
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