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:
Jun. 24, 2003
Filed:
May. 11, 2000
Alexander Goldovsky, Philadelphia, PA (US);
Bimal Patel, Allentown, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
An n-bit carry-skip adder includes a number of carry-skip stages and a logic circuit associated with one or more of the stages. The logic circuit includes split-adder logic and carry-skip logic configured such that a split control signal associated with the split-adder logic is applied to at least one gate of the carry-skip logic, so as to reduce a carry propagation delay of the adder. In an illustrative embodiment, the logic circuit is associated with an (n/2+1)th carry-skip stage of the adder, and the adder is configured to perform two parallel n/2-bit additions when the split control signal is at a first logic level, and to perform a single n-bit addition when the split control signal is at a second logic level. Advantageously, the invention allows the split-adder logic to be incorporated in a manner which minimizes the carry propagation delay without increasing the required circuit area.