Subject
Year
: Digital System
: 2009
Adder & Subtractor
Chapter 11
Overview
• Adder
• Subtractor
• Comparator
3
Basic Adder
• Half-Adder
4
Basic Adder
• Full Adder
5
Basic Adder
• Full Adder
6
Basic Adder Example
7
Parallel Binary Adder
8
Subtractor
• Half Subtractor
A
Di
B
Bo
A
DI
HS
B
Bo
9
Subtractor
• Full Subtractor
10
Comparator
• The basic function of a comparator is to compare the magnitudes of two binary
quantities to determine the relationship of those quantities
11
Comparator Example
12