WELCOME To

DIGITAL CLASS ROOM

A. R. M. Delowar Hossain Lecturer

Dept. of ICTCambrian College, Dhaka

Class-Eleven(xi)Date:10-08-2014

Input

CKT.(Processing)

SOUND(O/P)

?

Logic Gate

Application of Logic Gate: In light of logical

operation of logic gates those are used in every

digital electronic product, like computer, mobile

,calculator, even digital watches contain logic

gate.

AFTER LEARNING THIS LESSION

Students will be able to ▪ ▪ ▪

To know the mechanism of fundamental logic gates.

To Implement basic logic gates by universal gate.

To know equivalent circuit of every logic gate.

To understand classification of logic gate

Logic

Gate

Primary Gate

Secondary Gate

AND Gate

OR Gate

NOT Gate/Inverter

Universal Gate Combinational Gate

Defn. of logic gate:Classification of logic gate

O/P, Z=XY

Fig: AND GATE

Definition :Fig: Truth Table

I/P

Equ. Ckt of AND Gate

X

Y

I/P O/PX Y0 0

0 1

1 0

1 1

0Z

0

0

1

I/P O/PX Y0 00 11 0

1 1

X

YI/P O/P, Z=XY

Z

11

0

1

Fig: Operation Table Fig: NAND GATE

Definition :

Z=A+B

Fig: T. T.Fig: OR GATE

Fig:Equ.ckt of OR Gate

Definition :

Fig: T. T.

Definition:

Fig: X-OR GATE Fig: T. T.

Fig:Equ.ckt of OR Gate

INPUT OUT PUT

Definition:

=

Compare Various Types of Gate

Implementation basic Gate by Universal Gate

GROUP LESSION

G-A:Design the fundamental logic gate by NAND

Gate and draw the equ. ckt. of OR Gate. G-B: Design the fundamental logic gate by NOR

Gate and draw the equ. ckt. of AND Gate

Evaluation

1. What do you mean by logic gate ?

2. Explain the universal logic gate.

3. Draw the principle gates by NOR Gate.

Q-1: Write down the Defn , Symbol, Equn and

Truth Table of every logic gate.

Q-2: Draw the Eqvn. Ckt. of Primary logic gate

Quotation

People who are really serious about software (S/W ) should make their own hardware(H/W)

-------- Alan Kay

Technology is just a tool, in terms of getting thekids working together and motivating them, the teacher is the most important

--------- Bill Gates