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Variants of an improved carry look-ahead adder

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1 Author(s)
Doran, R.W. ; Dept. of Comput. Sci., Auckland Univ., New Zealand

An improved variation on the carry look-ahead adder has been proposed by H. Ling (IBM J. Res. Develop., vol.25, p.156, May 1981). Ling's approach is based on the propagation of a composite term in place of the conventional look-ahead carry. This approach gives an adder that is faster and less expensive. In the present study, Ling's adder is introduced and described in a general manner in order to expose the essence of his approach. From this reformulation, it is shown that there are many such variations on the carry look-ahead adder, a few of which share the desirable properties of Ling's adder

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Computers, IEEE Transactions on  (Volume:37 ,  Issue: 9 )