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Unformatted text preview: ECE 3040 Microelectronic Circuits Exam 3 Marc/1 16, 2007 . KT.— ff  " '* L"
Print your name clearly and largely: a) v Eel? t V ' 1 Instructions:
1. Closed book, closed notes. You are allowed to use 1 sheet of notes (1 page front
and back, letter size) as well as a calculator. 2. Show all work in order to receive full credit for your answers. Incorrect answers
may be awarded partial credit when appropriate. CIRCLE YOUR FINAL ANSWER WITH THE PROPER UNITS INDICATED.
Write legibly. If I cannot read it, it will be considered a wrong answer. DJ 4. Do all work on the paper provided. Clearly indicate which problem you are
solving on each page. Turn in all scratch paper, even ii‘it did not lead to an
answer. 5. There are 1(9 pages to this exam, including the cover sheet and blank pages.
There are 100 total points in this exam. Observe the point value of each problem
and allocate your time accordingly. Good luck! Part I:( 20 points) Multiple Choice
Select the M answer: 1.) (5—points) F or a Transresistance ampliﬁer designed for maximum gain,
a.) You should have a high input impedance and a high output impedance.
b.) You should have a high input impedance and a low output impedance
% You should have a low input impedance and a high output impedance
:d.)) You should have a low input impedance and a low output
v impedance. 2.) (5—points) In the MOSFET amplifier to the right. WITHOUT R1 doing any calculations, estimate the voltage gain. 15V; 30“ 3) ngL (CtiLarge) b_.) R2/R]+R2 _‘
@i one Vii Vout
.) Can not be determined without VT 100k 3.) (5—points) The ampliﬁer below has which of the following filter
Shapes (circle the correct ﬁlter shape)? 012i C2 4.) (5—points) Which of the following is true for feedback circuits.
a.) Feedback in a voltage ampliﬁer can decrease the input resistance.
b.) Feedback in a voltage ampliﬁer can increase the output resistance.
@iFeedback in a voltage ampliﬁer can increase the ampliﬁer bandwidth if the open
loop gain is larger than the closed loop gain.
d.) Feedback in a voltage ampliﬁer can decrease the ampliﬁer bandwidth if the open
loop gain is larger than the closed loop gain. Part 2: (50 points) Op Amp Circuit Analysis 5.) (20 points) Assume that the 0p amps are ideal. a.) (15 points) Represent Vout in terms of the three input voltages, Vim, Vinz, an3.
b.) (5 points) Detennine the input impedance seen by the source Vin} Extra work can be done here, but clearly indicate with problem you are solving. 6.) (30—points) Determine the voltage gain, input resistance and output resistance of the
following circuit. Assume that the op amps are ideal. "v’uut
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(Mini: : C’ i: VmIV ‘7’ Viv ' [/C “V “3 5%” Extra work can be done here, but clearly indicate with problem you are solving. Part 3: (30 points) MOSFET Ampliﬁer 7.) (BOpoints) Derive the voltage gain, input resistance and output resistance of the following ampliﬁer.
You may assume all capacitors have inﬁnite capacitance. Grading will be based as such:
5 points for converting the circuit into equivalent small signal circuit, 15 points for
deriving the voltage gain, 5 points for deriving the input resistance and 5 points for
deriving the output resistance. +VDD +
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"'9 Extra work can be done here, but clearly indicate with problem you are solving. [rig/“EVA " ‘ Extra work can be done here, but clearly indicate with problem you are solving. Extra work can be done here, but clearly indicate with problem you are solving. ...
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This note was uploaded on 09/05/2009 for the course ECE 3040 taught by Professor Hamblen during the Spring '07 term at Georgia Tech.
 Spring '07
 HAMBLEN

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