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:
Dec. 12, 1989
Filed:
Mar. 31, 1986
Glenn L Cash, Matawan, NJ (US);
Mehdi Hatamian, Oldbridge, NJ (US);
Adrianus Ligtenberg, Rumson, NJ (US);
American Telephone and Telegraph Company, AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
A fast pipeline adder comprising a plurality of registered adder rows. In one embodiment, additions in the pipeline are realized in reclocked half adders. In another embodiment, modified adders are employed which accept two carry inputs and develop two carry outputs. The resulting number of individual cells is reduced to approximately half of those in the prior embodiment. In still another embodiment, switch means are included in each cell to delete the reclocking and in still another embodiment, the adders in the diagonal of the pipeline adder are provided with additional inputs to permit use of the pipeline adder in recursive addition applications. In still another embodiment, the cells are permitted to output the inverse of the intended signal, reducing thereby the physical realization of the cells and increasing the speed of the cells.