Digital Principles and Computer Organization: Chapter 4: Combinational Circuits
Binary Parallel Adder
Questions: 1. What is parallel adder ? 2. Draw and explain the working of 4-bit parallel adder.
Binary Parallel Adder
•
We have seen, a single full–adder is capable of adding two one–bit numbers and
an input carry. In order to add binary numbers with more than one bit,
additional full–adders must be employed. A n–bit, parallel adder can be
constructed using number of full adder circuits connected in parallel. Fig.
4.5.1 shows the block diagram of n–bit parallel adder using number of full–adder
circuits connected in cascade, i.e. the carry output of each adder is connected
to the carry input of the next higher–order adder.
•
It should be noted that either a half–adder can be used for the least
significant position or the carry input of a full–adder is made 0 because there
is no carry into the least significant bit position.
Example: 1
Design a 4–bit parallel
adder using full–adders.
Solution :
Fig.
4.5.2 shows the block diagram for 4–bit adder. Here, for least significant
position, carry input of full–adder is made 0.
Review Questions
1. What is parallel
adder ?
2. Draw and explain
the working of 4–bit parallel adder.
Digital Principles and Computer Organization: Chapter 4: Combinational Circuits : Tag: : - Binary Parallel Adder
Digital Principles and Computer Organization: Chapter 4: Combinational Circuits
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