Design a full adder with decoder and external gates

Design with Decoder:

Input = n

Output= 2n        

Decoder size= n × 2n

Truth Table:

Input variableOutput variable
Xyzcs
00000
00101
01001
01110
10001
10110
11010
11111

Since, there are 3 input variables we need 3 × 23 or 3 × 8 decoder. Since there are 2 output variable so we need at least 2 external gates.

Here, c(x, y, z) = ∑ (3, 5, 6, 7)

And s(x, y, z) = ∑ (1, 2, 4, 7)

Circuit Diagram:

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