The coursework requires the submission of a single
report which contains two
elements which together contribute 50% to the overa
ll module mark. The marks
shown indicate the maximum possible marks that each
individual element
contributes to the final module mark.
The finished report should be submitted to the res
ource centre (Prospect
Building, St Peter’s) by the hand-in date shown abo
ve.
Coursework 1
(25%)
Write an essay about the different technologies whi
ch have been used to
implement logic systems both in the past and the pr
esent. Your essay
should be supported by references throughout.
Coursework 2
(25%)
This requires a section in the report detailing you
r solutions to the following
questions :
Q1. The presence of a 10V supply is to be indicated
using a LED whose forward bias
voltage is 2.8V and maximum operating current is 2
0mA.
a) Evaluate the highest intensity solution possibl
e using
series LED’s. (3%)
b) Design a parallel LED solution which uses 5
LED’s.
(3%)
Continued overleaf
Page 2 of 2
Q2. The N-type MOSFET transistor in the following c
ircuit has the
characteristics shown below :
a) If it is to feed a drain load resistor of 250
?
with a current of
10mA, what will be output voltage, V
DS
, and input voltage, V
GS
,
required?
(3%)
b) What value of R would be required to operate wi
th a V
DS
of 1V
and a V
GS
of 5V ?
(3%)
Q3. For the following logic circuit :
a) Identify the Boolean expression that describes
it. (3%)
b) Sketch its Karnaugh Map (3%)
c) Determine a NAND implementation of it (3%)
Q4. a) Find the binary, octal and hexadecimal equiv
alents to the
decimal number 110. (3%)
b) Evaluate the sum of the binary numbers
10101101
2
and
1100100
2
and check your solution in decimal. (3%)
A
F
B
C
0V
V
DS
5V
R
V
GS
0 1 2 3
4 5
20
15
10
5
V
GS
(V)
5
4
3
1
2
I
D
(mA)
V
DS
(V)
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