EE_10_F07_Lecture 1

# EE_10_F07_Lecture 1 - UCLA ELECTRICAL ENGINEERING...

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UCLA E LECTRICAL E NGINEERING D EPARTMENT : EE 10: C IRCUIT A NALYSIS 1 L ECTURE 1 LECTURE NOTES: OCTOBER 1, 2007 OUTLINE LECTURE NOTES ....................................................................................................................... 2 HOMEWORK DUE OCT 11, 2007 BEFORE CLASS: ............... ERROR! BOOKMARK NOT DEFINED. INTRODUCTION TO ELECTRONIC CIRCUIT PRINCIPLES ........................................... 2 Electronic Circuits .................................................................................................................. 2 Engineering System Models .................................................................................................... 2 System Components ................................................................................................................. 3 Circuit Models ......................................................................................................................... 3 Problem Solving ...................................................................................................................... 3 CIRCUIT MODEL EXAMPLES ................................................................................................ 4 Biomedical Electronics: Electrocardiogram ........................................................................... 4 Robotics Technology: Simple Motor Speed Control ............................................................... 4 IMPORTANT ASSUMPTIONS REGARDING ELECTRONIC CIRCUIT MODELS ........ 5 ELECTRONIC QUANTITIES AND UNITS ............................................................................. 5 C HARGE ....................................................................................................................................... 5 V OLTAGE ..................................................................................................................................... 6 C URRENT ..................................................................................................................................... 6 CIRCUIT ELEMENTS ................................................................................................................ 8 P OLARITY .................................................................................................................................... 8 SIGN AND POLARITY CONVENTIONS ............................................................................... 10 CRITICAL DEFINITION: THE PASSIVE SIGN CONVENTION ...................................... 10 POSITIVE AND NEGATIVE CHARGE FLOW .................................................................... 11 POWER ........................................................................................................................................ 12 P OLARITY OF P OWER T RANSFER ............................................................................................... 12 EXAMPLE: POWER .................................................................................................................. 14 EXAMPLE: POSITIVE AND NEGATIVE CHARGE FLOW .............................................. 14 CURRENT VOLTAGE CHARACTERISTICS ....................................................................... 15 RANGE OF VALUES OF CURRENT, VOLTAGE, AND POWER ..................................... 15 V OLTAGE R ANGE ...................................................................................................................... 15 C URRENT R ANGE ....................................................................................................................... 16 P OWER R ANGE ........................................................................................................................... 16 REVIEW ...................................................................................................................................... 17 1

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UCLA E LECTRICAL E NGINEERING D EPARTMENT : EE 10: C IRCUIT A NALYSIS 1 L ECTURE 1 LECTURE NOTES Please download Lecture Notes for Next Lecture and bring hardcopy to class. INTRODUCTION TO ELECTRONIC CIRCUIT PRINCIPLES ELECTRONIC CIRCUITS o Network of electronic devices o Engineering design goal is to select devices and implement circuits that meet prescribed requirements for providing measurements, processing signals, delivering energy, supporting communication, enabling computation, or providing control. o Electronic Circuit design and analysis focuses on circuit models o Circuit models are mathematical and graphical descriptions of electronic device networks. o Circuit models may be nearly exact duplicates of real world components o Circuit models may also be developed to provide an ideal and approximate model of real circuits. o Often very complex phenomena and design concepts are expressed in terms of circuit behavior. o A powerful set of analytical and computer-aided analysis tools have been developed for understanding circuits o Circuit models are fundamental to each electrical engineering field. ENGINEERING SYSTEM MODELS o Decompose Engineering System into subsystems o Each subsystem can be analyzed and designed separately, with coordinating interfaces and overall objectives. o At the lowest, fundamental level, are electronic circuits and devices. o Consider example of biomedical sensor: Blood oximeter Measures oxygen absorption in blood Relies on two Light Emitting Diode sources o Red region wavelength – 660nm Absorbed by arterial oxygen saturated blood o Near infrared – 940nm 2