điện tử va máy tính lê chí thông 2014 01 intro to ece final sinhvienzone com

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

I 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

Student ID Number

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Problem 1 The unit of all resistances in the following circuit is Ohm Find I1, I2, I3, VB using

the node method (2.0 points)

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Problem 2 Use the following circuit for this problem

a Find the Norton equivalent circuit for C1, and next find the Thevenin equivalent circuit for C2 (1.0 points)

b Compute the current I3 (0.5 points)

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Problem 3 Use the large signal model for diode, specify and find voltage VD1 , current ID1 of

diode D1, and voltage VD2 , current ID2 of diode D2 (2.0 points)

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Problem 4 Use the following circuit for this problem Given Vcc = 5V; V BEON = 0.7V; β = 100;

V CESAT = 0.2 (2.0 points)

a When Vin = 2.5 V, determine I B , I C , V CE and the state of transistor

b When Vin = 5 V, determine I B , I C , V CE and the state of transistor

c Determine ICSAT, IBSAT, VINSAT

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Problem 5 (2.5 points)

a Convert the following numbers to the required number systems Please show your work

b 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 Minimize the expression F1 in (b) and prove that ̅

A B C F1

0 0 0 0

0 0 1 1

0 1 0 0

0 1 1 0

1 0 0 1

1 0 1 1

1 1 0 0

1 1 1 0

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