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Logic Gates: Project Title

This document provides information about an investigatory project on logic gates. It includes an introduction to gates, truth tables, and Boolean algebra. The three basic logic gates - OR, AND, and NOT - are explained. The OR gate output is true if either input is true. The AND gate output is true only if both inputs are true. The NOT gate inverts its single input. Boolean expressions are used to represent the logical relationships between inputs and outputs of each gate.

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jeffery
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91 views7 pages

Logic Gates: Project Title

This document provides information about an investigatory project on logic gates. It includes an introduction to gates, truth tables, and Boolean algebra. The three basic logic gates - OR, AND, and NOT - are explained. The OR gate output is true if either input is true. The AND gate output is true only if both inputs are true. The NOT gate inverts its single input. Boolean expressions are used to represent the logical relationships between inputs and outputs of each gate.

Uploaded by

jeffery
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Investigatory Project

PROJECT TITLE :
Logic Gates
Contents

sl.no. title page no.


1 introduction 3
2 principle
3 basic gates
4 the OR gate
5 the AND gate
6 the NOT gate
7 the NOR gate
8 the NAND gate
9 the EX-OR gate
10 the EX-NOR
gate
11 summary
12 bibliography

Introduction

2
GATES : A gate is defined as a digital circuit which follows some

logical relationship between the input and output voltages. it is a


digital circuit which either allows a signal to pass through it or stops it.

● The logic gates are building blocks at digital electronics. they are
used in digital electronics to change one voltage level into another
according to some logic statement relating to them

TRUTH TABLE : A logic gate may have one or more

than one inputs, but has only one output. the


relationship between the possible values of input and
output voltages are expressed in the form of a table
called a truth table

● Truth table of a logic gate is a table that shows all the inputs and

outputs that are possible for the logic gates.

BOOLEAN ALGEBRA : The algebra which is based on binary nature

of the logic gates.

BOOLEAN EXPRESSIONS : They are the logical statements which

are followed by the logical gates.

3
Principle
Any Boolean algebraic operation can be associated with the input and
output, which represents the statement of boolean algebra. Although
these circuits may be complex, they may all be constructed from three
basic devices like a P-N junction diode, a resistance and a N-P-N
transistor.

we have three different types of logic gates and they are the AND
gate, the OR gate and the NOT gate.

LOGICAL STATEMENTS
1 0

High Low
Positive Negative

On Off
Close Open

Conducting Non conducting

Right Wrong
True False

Yes No

4
Basic Gates
THE OR GATE : It is a device that combines A and B to give Y as the
result. the OR gate has two or more inputs and one output. In Boolean
algebra, addition symbol [+], is referred to as the OR symbol.

The Boolean Expression : A + B = Y

This indicates that Y equals either A or B.

THE AND GATE : It is a device that combines A with B to give Y as the


result. the AND gate has two or more inputs and one output. In Boolean
algebra, the multiplication sign [*] is referred to as the AND symbol.

The Boolean Expression : A.B = Y -OR- A * B= Y

This indicates that Y equals to both A and B.

5
THE NOT GATE : It is a device that inverts the inputs. the NOT has

one input and one output. In Boolean algebra, the Bar symbol is referred
to as the NOT symbol.

The Boolean Expression: A̅ = Y

This indicates that Y is not equal to A.

● Making of logic gates was started by binary numbers.


● logic gates can also store information.

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