exam1_fall2009

exam1_fall2009 - Prof. Sam Palermo ECEN 325 Exam #1 October...

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Unformatted text preview: Prof. Sam Palermo ECEN 325 Exam #1 October 6, 2009 Texas A&M University Department of Electrical and Computer Engineering ECEN 325 — Electronics Fall 2009 Exam #1 Instructor: Sam Palermo 0 Please write your name in the space provided below 0 Please verify that there are 5 pages in your exam 0 You may use one double-sided page of notes and equations for the exam 0 Good Luck! Problem Score Max Score 1 3O - - 4 Total / J, l / ’ / 2‘ '“\ Name: //Z\!/V€ ///éwfir/[ »/// 2 Prof. Sam Palermo ECEN 325 Exam #1 October 6, 2009 Problem 1 (30 points) Plot the magnitude and phase response of the following transfer functions. Label key points and slopes. ' 0 E 4 108 s+106 [fig 1 “if???” I: I a) F(S) = '—(5——")_7_ (15 points) ‘ EU (s+10 )(s+10 ) HM“? G _ s(s+106) Prof. Sam Palermo ECEN 325 Exam #1 October 6, 2009 Problem 2 (40 points) Assume for all of problem 2 that all operational amplifiers are ideal. a) Assume that you have 2 inputs V1 and V2; using operational amplifier(s), design a circuit that implements the following transfer function. (20 points) 5 110(5) = $8V1 — 5V F2 4 b) For the following circuit: i. Obtain the transfer function, vo(s)/vi(s) (10 points) ii. Sketch the magnitude response if R1=R2=lkfl, R3=R4=10kQ, C=10nF (5 points) iii. What is the value of the input resistance? (5 points) “ ":2" 2 \ f i N J ” } .i. k I?) C ,— l0 } 4 ECEN 325 Exam #1 October 6, 2009 Prof. Sam Palermo Problem 3 (20 points) The operational amplifier used in the remainder of the problem has the following open-loop transfer function 105 MS) = S 1 + ‘16 a) Sketch the open-loop magnitude response of the operational amplifier. Make sure to label the unity—gain frequency. (5 points) b) The finite gain-bandwidth operational amplifier from part (a) is used in the following amplifier circuit. Find the expression for the closed-loop transfer function (VD/Vi). (5 points) c) What is the closed-loop -3dB frequency (bandwidth) of the total amplifier circuit? (5 points) (1) Sketch the closed-loop magnitude response of the amplifier circuit. (5 points) 2R 0‘. 49 c ,,,,,,,,,,,,,,,,,,,, MW.» /1 g\\\ W gar? * A /. : MMMw—wmw L ““““““““ W“ a V a {7 5‘ Prof. Sam Palermo ECEN 325 Exam #1 October 6, 2009 Problem 4 (10 points) The operational amplifier for this problem has a finite slew rate of lV/us. 3) b) For an output lOOkHz sine wave, what is the maximum amplitude that can be reproduced without distortion? (5 points) .l Aura)“ l l (3 0: \\/ / / V0 L A81,“ UJJ" ._... f { Ci {.2 /~ ff)“ 1 AL; (auxi2+‘ Ci "7!“ 11/ r», L g 3‘ M _\ For an output 10V amplitude triangle wave, what is the maximum frequency that can be reproduced without distortion? (5 points) r 1 JV /4 ?3 ’iOU E. D " / r—M'“ N i v"? 4% ”””””” " :1 ” K ‘” / 52 a 7/ i e, / In iv/Wy/M, am ,,,,,,,, ,, w k l 3/. 17, s y“ /"'.:;f L, x \ H1» \ f (w, ‘1 ...
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exam1_fall2009 - Prof. Sam Palermo ECEN 325 Exam #1 October...

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