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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 doublesided page of notes and equations for the exam
0 Good Luck! Problem Score Max Score
1 3O 

4
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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 openloop
transfer function 105
MS) = S
1 + ‘16
a) Sketch the openloop magnitude response of the operational ampliﬁer. Make sure to
label the unity—gain frequency. (5 points)
b) The ﬁnite gainbandwidth operational ampliﬁer from part (a) is used in the following
ampliﬁer circuit. Find the expression for the closedloop transfer function (VD/Vi).
(5 points)
c) What is the closedloop 3dB frequency (bandwidth) of the total ampliﬁer circuit?
(5 points)
(1) Sketch the closedloop magnitude response of the ampliﬁer circuit. (5 points) 2R
0‘.
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,,,,,,,,,,,,,,,,,,,, MW.» /1
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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: \\/ /
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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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