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ece255 fn sp1998.pdf
ece255_fn_sp1998.pdf
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ece255 fn sp1998.pdf-ID # ...
ece255_fn_sp1998.pdf-ID # ______________________________ NAME ______________________________ EE-255
ece255 fn sp1998.pdf-ID # ...
ece255_fn_sp1998.pdf-ID # ______________________________ NAME ______________________________ EE-255
Page 1
1
ID #
______________________________
NAME
______________________________
EE-255
FINAL EXAM
May 9, 1998
Instructor (circle one)
Ogborn
Lundstrom
This exam consists of 30 multiple choice questions.
Record all answers on this page, but you must turn in
the entire exam.
There will be no partial credit, but you must show your work.
Circle the one best answer for each question.
Five points per question.
Do not open and begin until you are instructed to do so!
1)
a
b
c
d
e
16)
a
b
c
d
e
2)
a
b
c
d
e
17)
a
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e
3)
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18)
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4)
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19)
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5)
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20)
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6)
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21)
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7)
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8)
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23)
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9)
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24)
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10)
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25)
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27)
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14)
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29)
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30)
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Page 2
2
Problems 1) - 8) concern the amplifier shown below.
Note that the load consists
of an 8K resistor in parallel with a 10 pF capacitor.
Assume that the transistor is
described by I
D
= 1.5(V
GS
- 2)
2
mA and C
gs
= 8 pF and C
gd
= 3 pF.
8 K
Ω
8 K
Ω
V
s
25 V
R
SS
200K
200K
100K
10 pF
5
μ
F
1
μ
F
25
μ
F
Figure 1
1)
The value of R
SS
that will bias the MOSFET at I
D
= 1.5 mA is:
(a)
0.5 K
(b)
1.3 K
(c)
2.7K
(d) 3.4 K
(e)
6.3 K
---------------------------------------------------------------------------------------------------------------------
2)
Assuming that the MOSFET is biased at I
D
= 1.5 mA, the mid-frequency gain, v
out
/v
s
,
of
the amplifier is:
(a)
-6
(b) +6
(c)
-12
(d)
+12
(e) -24
---------------------------------------------------------------------------------------------------------------------
3)
The Thevenin equivalent resistance seen by the 1
μ
F capacitor in Fig. 1 is:
(a)
50 K
Ω
(b)
100 K
Ω
(c)
200 K
Ω
(d)
300 K
Ω
(e)
500 K
Ω
Page 3
3
4)
The capacitor most likely to control the low-frequency response of the amplifier in Fig. 1 is
(a)
the 1
μ
F
capacitor
(b)
the 5
μ
F
capacitor
(
c)
the 25
μ
F capacitor
(d)
the 10 pF capacitor
(e)
C
gs
, the 8 pF capacitor inside the MOSFET
---------------------------------------------------------------------------------------------------------------------
5)
The value of the Miller capacitance for the amplifier in Fig. 1 is
(a)
75
μ
F
(b) 3 pF
(c) 10 pF
(d)
24 pF
(e)
39 pF
---------------------------------------------------------------------------------------------------------------------
6)
If the value of R
SS
is
reduced
, which parameter(s) of the Fig. 1 amplifier change?
(a)
the input resistance
(b)
the output resistance
(c)
the mid-frequency gain
(d)
all of the above
(e)
none of the above
---------------------------------------------------------------------------------------------------------------------
7)
If it is desired to attach a 100
Ω
load instead of the 8K
Ω
load shown in Fig. 1 and maintain
about the same gain of the amplifier at the same value, then what type of amplifier stage
should be inserted between this one and the load?
(a)
CE
(b)
CB
(c)
CG
(d)
CD
(e)
another CS
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