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Fundamentals of Electrical and Computer Engineering

Gary A. Ybarra

Copyright 2014 by Gary A. Ybarra

Version 2.3

Fundamentals of Electrical and Computer Engineering

Table of Contents

1. Introduction... 1 2. Digital Logic Circuits....5 3. Current and Voltage 17 4. Elements and Laws..... 27 5. Power.. 41 6. Node Voltage and Branch Current Methods... 54 7. Equivalent Circuits......67 8. Capacitance and Electromagnetics..... 84 9. RC Switched Circuits..... 99

10. Complex Numbers. 110 11. Sinusoids, Phasors and Impedance... 114 12. Frequency Response and Filters 130 13. AC Circuit Response.. 140 14. AC Node and Branch Methods.. 144 15. Fourier Series. 149 16. Response to a Periodic Input.. 160 17. Inductance.. 165 18. RL Switched Circuits..... 171 19. RLC Circuits in the Frequency Domain.... 180 20. Dependent Sources. 193 21. Op-Amps 198 22. Semiconductors, Diodes, and MOSFETs.. 215 A1.Appendix 1..... 227

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Chapter 1

Introduction

1.1 Engineering

Engineering is the acquisition and processing of information to design products and processes

that improve human life quality. Science and mathematics are used as tools to solve problems

requiring the engineer to consider standards and constraints in the problem solution process.

Good engineering design practice takes into consideration many factors such as cost,

environmental impact, manufacturability, health and safety, ethics, as well as the social and

political impacts of the product or process being created. Science is a systematic approach to the

acquisition of knowledge based on testable explanations for phenomena in the universe enabling

predictions of event outcomes. Science differs from engineering. Both are important to the

process of learning about how the world works, and the exercise of one discipline often involves

the other. Engineering goes beyond seeking to understand how the world works. Engineers

design, build and test devices, systems and processes that involve the creation of something new.

There is an inherent process of invention in generating new products and processes that make the

lives of humans better and the state of the world better. Some of the inventions of engineers have

led to problems in the environment and general state of the planet, but a responsible engineer is

committed to considering the environmental impact of his/her products and is bound by ethical

principles to produce devices and systems that promote a greener world and a safe environment

in which our children are raised. Engineering is an exciting and satisfying career and provides an

excellent foundation for any career endeavor.

1.2 Electrical and Computer Engineering

Electrical and Computer Engineering (ECE) is a profession that integrates several sub-

disciplines including analog and digital circuits and devices, signal processing, communication

systems, computer architecture and networking, micro and nanodevices, power systems

including rotating machines and power distribution, quantum computing, photonics, sensing,

waves and metamaterials, required to solve engineering problems to improve human life quality.

The list of ECE sub-disciplines presented is not exhaustive, but reflects many of the strengths

possessed by the faculty at many universities. It is very unusual to find an ECE program that

excels in all areas of ECE, but depending on the expertise of the faculty, the various sub-

disciplines of ECE are represented to some degree.

1.3 Fundamentals of ECE

Fundamentals of Electrical and Computer Engineering is intended to provide a rigorous

introduction to the field of ECE, enabling informed selection of areas of concentration for

students planning to continue further study within the field of ECE. It is also an excellent

resource for students intending to take the Fundamentals of Engineering exam as part of the

process for obtaining Professional Engineering licensure in a given state.

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1.4 Engineering Notation

It is common in the practice of ECE to encounter both large and small quantities. A set of

engineering prefixes have been defined to efficiently deal with large and small quantities. The

use of these engineering prefixes is called engineering notation. Engineering notation is similar

to scientific notation, but the powers of ten are multiples of three. All engineering students

should be familiar with the notation of engineering prefixes from 10-15

(femto) to 1015

(Peta).

The following table should be common knowledge to all engineering students.

Engineering

Notation

Engineering

Prefix

Abbreviated

Engineering prefix

Example usage

10-15

femto f fs

10-12

pico p pF

10-9

nano n nm

10-6

micro

10-3

milli m mW

103 kilo k km

106 mega M M

109 giga G GB

1012

tera T TB

1015

peta P PHz

Figure 1.1 Table of engineering prefixes and their definitions.

The notation used in this textbook for voltage and current expresses all time domain quantities

with a lower case v for voltage and i for current. Upper case V and I are reserved for sinusoidal

(AC) voltage maxima and current maxima respectively. A time domain voltage or current may

be explicitly written as a function of time as in v(t) or simply v with the understanding that the

voltage may be a constant (DC) or time varying.

1.5 Plagiarism

Every instructor has a different set of expectations regarding what is considered acceptable

collaboration. It is the obligation of the instructor to make collaboration expectations known to

the students. And it is the students responsibility to follow these expectations. The collaboration

policy for ECE 331 is documented in detail. Any questions or comments regarding the

collaboration policy are welcome and the reader is encouraged to discuss any issues in question

with the instructor.

Weekly homework assignments, tests, and a final comprehensive examination will sometimes

require students to express their understanding of certain topics in writing. For example, students

may be required to learn about batteries and the electrochemical reactions that take place within

different batteries. At least two sources are required to be examined and cited properly. It is very

important that students paraphrase what they learn by reading the sources and setting the sources

aside as they write. If text is taken directly from a source, the text must be in quotations. It is

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plagiarism to have a source of information open and simultaneously transcribe and

paraphrase sequences of sentences taken from that source. The source may be re-examined

to ensure correctness of content, but the user of that information is required to cite the source.

On tests and the final examination, students must be prepared to answer essay questions without

having access to any sources. Throughout the textbook, definitions are provided. Students are

required to know these definitions and be able to provide the definitions in their own words

accurately and completely.

1.7 Solution of Transient Analysis (Switched Circuits)

This book provides the reader with a complete analysis of RC and RL switched circuits including

the extraction of the differential equations that arise from analyzing RC and RL circuits during

the transient portion of the solution. Following the extraction of a differential equation, the

solution is obtained using the method of undetermined coefficients. It is possible to analyze RL

and RC switched circuits by solving for initial and final (steady state) values and the equivalent

resistance seen by the energy storage element in the steady state, and then plugging those values

into memorized equations. Due to the limited time available for teaching transient analysis in

ECE 331, the memorized solution form is the approach taken in the course. No differential

equations are extracted from switched circuits, only steady state values, and those values are then

plugged into memorized formulas. The full approach of extracting differential equations and

solving those differential equations are presented in this textbook for completeness.

1.8 Recognition

The electric circuit concepts presented in this book were in large part learned from Dr. Donald R.

Rhodes (1923- ), University Professor Emeritus, North Carolina State University. Don Rhodes

in turn learned a large portion of his conceptual understanding of electric circuits from Charles

Steinmetz (1856-1923). In particular, the author is indebted to Don Rhodes for his understanding

of the branch current method (BCM) of solving circuits, which uses physical currents instead of

fictitious loop currents used in mesh analysis. To the authors knowledge, there is no textbook on

electric circuits that utilizes the branch current method. Hence, the continued life of the BCM

may be hinged upon the understanding of this technique by the readers of this textbook.

The authors understanding of semiconductor physics was developed through discussions with

Dr. Hisham Massoud, and attending many of his lectures on semiconductor devices and circuits

utilizing those semiconductor devices

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