điện tử va máy tính lê chí thông 2013 04 intro to ece final sinhvienzone com

Le Chi Thong INSTRUCTIONS:  Answer on this question sheet..  Arithmetic-only calculators are accepted..  Show all your work, e.g., your solution process, the equations that you use,

I NTRO TO E LECTRICAL AND C OMPUTER E NGINEERING (ECE110)

F INAL E XAMINATION

Semester 1 – 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

Student ID Number

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Problem 1 (2 points) Use the following circuit for this problem Given Vs = 5V; R1 = 1K; VON

(of diode) = 0.7V

a) Determine I d and Vd for Is = 7 mA (Assume

that diode is on or off, and then validate)

b) Determine I d and Vd for Is = 4 mA (Assume that diode is on or off, and then validate)

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Problem 2 (2 points) Use the following circuit for this problem Given Vcc = 7V; RB = 80 kΩ;

Rc = 2 kΩ; V BEON = 0.6V; β = 100; V CESAT = 0.2V

a) When Vin = 1V, determine I B , I C , V CE and the state of transistor

b) Find the minimum value of Vin required to make the transistor becomes saturated

V in min =

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Problem 3 (2 points)

a) Using Thevenin, find E th and R th so that Circuit B is equivalent to Circuit A

b) Using Norton, find I N and R N so that Circuit C is equivalent to Circuit B

R1 = 6 Ω

+ _

E = 15V

R2 = 20 Ω

B Circuit A

R th

+ _

E th

A

B Circuit B

A

B Circuit C

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Problem 4 (2 points)

Use the truth table given below for this problem

a) Write the canonical SOP for F1

F1 =

b) Use Boolean identities to minimize the function F1

F1 =

c) Draw the AND-OR circuit for F1

d) Rewrite F1 and draw the 2-level NAND-NAND circuit

A B C F1

0 0 0 0

0 0 1 0

0 1 0 1

0 1 1 1

1 0 0 0

1 0 1 0

1 1 0 1

1 1 1 0

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Problem 5 (2 points) Use the following logic circuit for this problem

a) Write the Boolean expression for F2

F2 =

b) Write the canonical SOP for F2

F2 =

c) Find the truth table for F2

d) Draw the waveform for F2

X

Y

Z

F2

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