Le Chi Thong INSTRUCTIONS: Answer on this question sheet.. Show all your work, e.g., your solution process, the equations that you use, the values of the variables used the equati
Trang 1I NTRO TO E LECTRICAL AND C OMPUTER E NGINEERING (ECE110)
F INAL E XAMINATION
Summer Semester – Academic year 2012-2013
Duration: 90 min
Department of Electronics Engineering Lecturer
Dr Le Chi Thong
INSTRUCTIONS:
Answer on this question sheet
Books, notes, laptops, iPads, … are NOT accepted
Arithmetic-only calculators are accepted
Show all your work, e.g., your solution process, the equation(s) that you use, the values
of the variables used the equation(s), …
Include the unit of measurement in each answer
Do NOT communicate with any other students
Problem 1 Use the node method to determine I 2 , I 3 , V A (1.5 points)
Student ID Number
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Trang 2Problem 2 Use the “accurate” model for diode the following circuit (1.5 points)
a Assume that diode is on, calculate I D and verify the assumption
b Assume that diode is off, calculate V D and verify the assumption
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Trang 3Problem 3 Use the following circuit for this problem Given Vcc = 5V; V BEON = 0.7V; β = 100;
V CESAT = 0.2 (2 points)
a When Vin = 2V, determine I B , I C , V CE and the state of transistor
b When Vin = 4V, determine I B , I C , V CE and the state of transistor
c Determine the minimum value for R1 in order to have active state when Vin = 4V
R1 min =
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Trang 4Problem 4 Use the “large signal” model for diode the following circuit and determine V D1 , I D1 ,
V D2 , I D2 (2 points)
Problem 5 (3 points)
a Convert the following numbers
101 1011B = ?D
11 1110B = ?H
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Trang 5b Use the truth table given below for this problem Write the expression F1 in the canonical SOP
form
F1 =
Draw the AND-OR circuit for F1
c Write the canonical SOP expression for F in the following circuit
F =
A B C F1
0 0 0 0
0 0 1 1
0 1 0 1
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 1
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