ECE102
Quiz 2 – Question Pages
Fall 2009
1
Student ID
Name (Last, First)
Write your answers on the separate answer pages; we will not look at these question pages.
Question 1
(2 + 2 = 4 points):
(a) Consider a linear system that has output
V
out1
when the input is
V
in1
:
V
in1
(V)
= 1 + 4
⋅
sin(9
⋅
t) +
5
⋅
10
3
⋅
sin(5
⋅
10
8
⋅
t)
+ sin(10
6
⋅
t)
V
out1
(V)
=
2
⋅
sin(9
⋅
t) + 15
⋅
10
3
⋅
sin(5
⋅
10
8
⋅
t +
π
/2) + 5
⋅
sin(10
6
⋅
t +
π
/4)
What is the output
V
out2
of this system when the input is
V
in2
(V)
= 100 + 5
⋅
sin(9
⋅
t) + 4
⋅
sin(5
⋅
10
8
⋅
t) ?
(b) What is the reason most linear systems (such as communication systems or
amplifiers) use sine and cosine waves as inputs? Be brief (1 sentence).
Question 2 (4 + 1 + 1 = 6 points):
Consider the MOSFET circuit below.
(a) Find
V
1
when resistor
R
1
= 1 k
Ω
.
(b) What is the minimum
value of
R
1
such that the nMOS operates in saturation?
(c) What is the maximum
value of
R
1
such that the nMOS operates in saturation?
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 Spring '09
 Trigraph, diode circuit, question pages, kΩ R1 V1, diode D1 VD0

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