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friends..how could you make a full adder using two half adders....pls show me how would you do that with boolean expressions.......i.e...taking a full adder logical expression and then simplifying it to get two half adders......pls ..............urgent

friends..how could you make a full adder using two half adders....pls show me how would you do that with boolean expressions.......i.e...taking a full adder logical expression and then simplifying it to get two half adders......pls ..............urgent

Grade:Upto college level

1 Answers

jitender lakhanpal
62 Points
8 years ago

hi murali

 

the logical expression of half adder is  A and B are inputs 

 

S = A XOR B             C =  A . B      S is SUM C is carry over BOTH ARE OUTPUT

 

the logical expression of full adder is

A , B,C are inputs

S = A XOR B XOR C         C = ( A XOR B ) . C +  A . B      ARE THE OUPUT  

so very clearly we can use half adder S output and another input C to get S = A XOR B XOR C 

and we have to use one OR gate also for C in full adder

 

so clearly we get XOR gate and AND gate from half adder which we can use to make FULL ADDER

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