Electronics Engineering

How do you construct half adder using 2 1 multiplexer?

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2012-12-30 21:05:19
2012-12-30 21:05:19

Use the multiplexer to choose the correct output based on the inputs (use the truth table).

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The full adder takes care of everything, A, B, CarryIN, Sum, and CarryOut. I don't see why you would need a half adder after using a full adder, unless you were trying to process look-ahead carry, but that requires more than just a half adder.


Do you mean :- how to get full adders by using half-adders? For this question refer following answer - A full-adder can be obtained by combining two half-adders and one or gate. Details on full-adder and half-adder can be referenced from following link http://www.fullchipdesign.com/fulladder.htm



Making a full subtractor using nand gates is very similar to making a half subtractor using nand gates. All you would do is construct the adding a whole adder.


you must use: 9 and gate 3 full adder 3 half adder


half adder does not have a carry in (Cin) while a full adder has the Cin


The full adder can account for carry-in and carry-out. The half adder can't.


Full adder is better than half adder because in half adder we can perform operation on only two digits and in full adder we can perform operation on three binary digits.


asdfghjkl;' s-sum and c'-carry see for half adder s=a(xor)b and c'=ab for full adder s=a(xor)b(xor)c and c=ab+bc+ac or ab+c(a(xor)b) we can convert two half adder to full adder with help of and or gate. . . ! we got two half adder * for first half adder input is a and b therefore. . .s=a(xor)b and c'=ab * for second half adder input is a(xor)b and c therefore. . .s=a(xor)b(xor)c and c' is (a(xor)b)c note: now connect the c' of first half adder and second half adder to 'or' gate resulting is ab+c(a(xor)b)


invert the subtractor and add using a half adder call the carry a borrow



Two half adders are required for making A full adder.!


A half adder has less components, and may therefore be cheaper. So, in cases where all you need is a half adder, it may be more convenient to use a half adder. Or it may be more convenient to mass-produce only the full adders, since a full adder can work as a half-adder as well.Also, in introductory electronics textbooks, the half-adder would be introduced first, just because it is simpler.


A full adder has a sum bit and a carry bit. A half adder just has a sum bit.


Its in Pg 146 in Digital Design Author: Morris Mano-4th Edition.


No. A full adder is two half adders with a carry circuit to combine the two carries together.


they are integrated in the calculators


Number of input bits. Half adder: (Cout,Q) := A+B Full adder: (Cout,Q) := A+B+Cin


The half adder adds two binary bits and produces the output(sum and carry). Full adder adds two significant bits and a previous carry and produces the output(sum and carry). Combination of two half adder and a OR gate is called a half adder.


1010 + 1011 = [1] 0101 here [1] ->carry in half adder this carry is not taken into account which is considered in case of full adder.


half adder is the computational device that adds two binary digits while full adder is the computational device that adds three binary digits.


to add two bit no. in computer chip half adder is use.


half adder is computational device which is used to add two binary digits


by using 4 NCL gates we can design or implement a half adder.gates used in half adder are TH12[1 GATE],TH22[1 GATE] and TH24COMP0 [2 GATES].this NCL have a concept of DUAL-RAIL.output we get for this are S0,S1,Cout0,Cout1.



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