Adder

Abstract

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• A Combination Circuit that performs addition

Half Adder

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• Built with 1 XOR for the current bit & 1 AND for the carry bit
• Takes in 2 Bit

Full Adder

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• Takes in 3 Bit
• Built with 2 Half Adder
• The sum of the 1st Half Adder is added with the cin by the 2nd Half Adder
• The sum output of the 2nd Half Adder is the final sum & the cout is the final cout
• For the cout, we need to have an OR to pipe out the final cout to handle situation where the first Half Adder’s cout is 1 while the cin is 0 & sum of the first Half Adder is 0