International Business Machines Corporation

Hartmut Sturm

Wilhelm Ernst Haller

Ricardo H Nigaglioni

Mark D Mayo

A Carry-Select Adder structure comprising a carry generation network and a multiplexer to select a particular pre-calculatad sum of a bit-group via orthogonal signal levels of a Hot-Carry signal provided by said carry generation network (), wherein in order to provide orthogonal signal levels of said Hot-Carry signal, the carry generation network () comprises two carry lookahead trees () working in parallel to each other, wherein a first carry lookahead tree () provides a first signal level of the Hot-Carry signal, and a second carry lookahead tree () provides a second, compared to the first signal level inverse signal level of the Hot-Carry signal. Furthermore a method to operate such a Carry-Select Adder is described.

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Grasellenbach, Germany

Hartmut Sturm