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4 Bit Parallel Adder

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**Author: **
Vaibhav Mishra

**Forked from: **
Sahir Ahmed/4 Bit Parallel Adder

**Project access type: **
Public

**Description: **

In the preceding section, we discussed how two binary bits can be added and the addition of two binary bits with a carry. In practical situations it is required to add two data each containing more than one bit. Two binary numbers each of *n* bits can be added by means of a full adder circuit. Consider the example that two 4-bit binary numbers B _{4}B _{3}B _{2}B _{1} and A _{4}A _{3}A _{2}A _{1} are to be added with a carry input C _{1}. This can be done by cascading four full adder circuits as shown in Figure 5.48. The least significant bits A _{1}, B _{1}, and C _{1} are added to the produce sum output S _{1} and carry output C _{2}. Carry output C _{2} is then added to the next significant bits A _{2} and B _{2} producing sum output S _{2} and carry output C _{3}. C _{3} is then added to A _{3} and B _{3} and so on. Thus finally producing the four-bit sum output S _{4}S _{3}S _{2}S _{1} and final carry output Cout. Such type of four-bit binary adder is commercially available in an IC package.

**Created: **
Jan 23, 2024

**Updated: **
Jan 23, 2024

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