A systematic approach to the design of structures for arithmetic

A design tool for the decomposition of binary digital structures for addition and subtraction has been developed. A simplified theory reduces a complex structure to a collection of basic structures of one type, namely, a full adder. The simplified theory is applicable to the design of parallel counters and array multipliers. A general theory is used for decomposition to three types of basic structures, whose complexity is usually on the order of a half-adder. The general theory is applicable to redundant array multipliers and signed-digit adders.