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Quiz 3
Winter 2005
1
0 V
R = 1 k
Ω
2 V
4 V
4 V
Student ID
Name (Last, First)
Score
Question 1 (5 = 2 + 3 points):
(a) For the feedback system below, find the expression for the output signal
Y
.
(b) Consider the same feedback system as in part (a). Input
X
1
is the desired signal and
input
X
2
is noise. If A
2
= 1, choose the values of A
1
and B such that the closedloop
gain for the desired signal is approximately 10 and the signaltonoise ratio (S/N) is
maximized. Your choices for A
1
and B are limited to the blocks below (where the
number inside signifies the gain of the block).
Question 2 (8 = 2 + 3 + 3 points):
(a) Calculate the current flowing through resister R.
25
Q1
Q2
Q3
Q4
For those answers that are not a graph or drawing,
you have to put a box around your result. You may
loose credit if you don’t.
Write your answers on the separate blank pages. Do
not scribble them in between the lines of the
question. Write your steps in a logical order, not
quasirandomly placed on the page. We will not go
hunting for your answers.
A
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This note was uploaded on 05/30/2009 for the course ECE 641158 taught by Professor Curtshurgers during the Spring '09 term at UCSD.
 Spring '09
 CurtShurgers

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