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How can convert a full adder to a full subtractor with circuit?
Wiki User
∙ 11y ago
let us consider three inputs a,b,c and their sum as s, difference as d and carry as c and borrow b
in full adder circuit :-
s= a (XOR) b (XOR) c
carry = ab+ac+bc
in full subtractor :-
d= a (XOR) b (XOR) c
borrow b = a'b+a'c+bc
so on observing these two we notice that sum and difference are one and the same coming to carry and borrow the only difference is to obtain borrow from carry just complement the input a
Wiki User
∙ 11y ago
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http://img11.imagevenue.com/img.php?image=24275_full_sub_with_half_122_600lo.jpg
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http://wiki.answers.com/Q/You_want_advantages_and_disadvantages_of_full_adder"
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simply by complementing x input before applying to and gate for generating carry
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Full subtractor using 2 half subtractor?
The half adder is an example of a simple, functional digital circuit built from two logic gates. A half adder adds two one-bit binary numbers A and B. It has two outputs, S and C (the value theoretically carried on to the next addition); the final sum is 2C + S.
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Half-Subtractor circuit using NOR gates?
By using 5 NOR gates, we can implements half-subtractor. The inputs for 1st NOR gate are A and B, for 2nd NOR gate inputs are the output of 1st NOR gate and A input, for 3rd NOR gate inputs are the output of 1st NOR gate and B input, for 4th NOR gate the inputs are gates 2 and 3, and for last gate input is the output of the 4th gate.
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Advantage:1:To overcome half subtractor, full subtractor comes into play
