Electrical and Electronics Circuits (2010)

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Electrical and Electronics Circuits (2010)

Lecturer: Prof. Soonhoi Ha (301-408, x8382)

sha@snu.ac.kr, http://peace.snu.ac.kr/sha

Textbook: Foundations of Analog and Digital Electronic Circuits

Course homepage: http://peace.snu.ac.kr/courses & ETL

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Tips for the course

 Do not leave the class until you understand the contents.

Exercise is the best way to learn the key concepts.

Better if you can prepare and review the class

Why do you need this course

– Pre-requisite for advanced system courses – Broad knowledge on IT-related issues

공학수학 (Eng. Math)

전기전자회로 (This course)

컴퓨터 시스템 (Computer

System)

내장형 시스템 (Emebdded

System)

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Chap. 1 Circuit Abstraction

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Lumped Circuit Abstraction

Physical element

Real circuit

Circuit Element

Electric circuit Model

Model

Interconnection Interconnection

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The Easy Way …

R is the “lumped circuit abstraction” of the bulb.

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Lumped Circuit Abstraction Assumption

V and I must be defined for the element

Element behavior is

completely captured by its I-V relationship.

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Direction of Current and Voltage

A i =3A i = -3A B

A i B

vAB 3V

vBA 3V

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P = VI

1.5V

1k 

i =1.5mA

Power consumed by the resistor: 2.25 mW Power consumed by the battery? -2.25 mW

Energy =

power dt

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i-v characteristics – Voltage source – Current source

+ v -

i

Resistor: i = f(v), v = g(i) In general, F(v,i,t) = 0

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The resistance element: Ohm ’s law

Conductance = 1 / resistance P = VI

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Diode: non-linear resistor

+ v -

i

(a) Diode circuit symbol (b) Characteristic equation

0

VT

v

eIi

(c) i-v characteristic 0.7

i

v

0.7

(d) simplified i-v characteristic

v v

i i

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1

3 2

(b) Circuit

element

(a)

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Definition of a loop and a mesh

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Draw the directed graph. How many nodes and edges exist?

4 3

1 2

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