The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 2011
Filed:
May. 15, 2007
Wilhelm Haller, Remshalden, DE;
Mark Mayo, Wappingers Falls, NY (US);
Ricardo H. Nigaglioni, Austin, TX (US);
Hartmut Sturm, Grasellenbach, DE;
Wilhelm Haller, Remshalden, DE;
Mark Mayo, Wappingers Falls, NY (US);
Ricardo H. Nigaglioni, Austin, TX (US);
Hartmut Sturm, Grasellenbach, DE;
International Business Machines Corporation, Armonk, NY (US);
Abstract
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.