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:
Aug. 30, 1994
Filed:
Nov. 20, 1992
Laurence P Flora, Valley Center, CA (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
A Wallace-type binary tree multiplier in which the partial products of a multiplicand and a multiplier are produced and then successively reduced using a plurality of adder levels comprised of full and half adders. This reduction continues until a final set of inputs is produced wherein no more than two inputs remain to be added in any column. This final set is then added using a serial adder and a carry lookahead adder to produce the desired product. The additions at each level are performed in accordance with prescribed rules to provide for fastest overall operating speed and minimum required chip area. In addition, the lengths of the serial adder and carry lookahead adder are chosen to further enhance speed while reducing required chip area.