| 摘要 |
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 ( 21 ), wherein in order to provide orthogonal signal levels of said Hot-Carry signal, the carry generation network ( 21 ) comprises two carry lookahead trees ( 22, 23 ) working in parallel to each other, wherein a first carry lookahead tree ( 22 ) provides a first signal level of the Hot-Carry signal, and a second carry lookahead tree ( 23 ) 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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