This operation considers that the addition of minuend along with the 2’s complement of the subtrahend is equal to their subtraction.As shown in the figure, the parallel binary subtractor is formed by combination of all full adders with subtrahend complement input. The parallel subtractor can be designed in several ways including combination of half and full subtractors, all full subtractors or all full adders with subtrahend complement input. Parallel Subtractor – A Parallel Subtractor is a digital circuit capable of finding the arithmetic difference of two binary numbers that is greater than one bit in length by operating on corresponding pairs of bits in parallel.
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