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. 19, 1989
Filed:
Jun. 10, 1987
Erik De Man, Munich, DE;
Tobias Noll, Munich, DE;
Siemens Aktiengesellschaft, Berlin, Munich, DE;
Abstract
A series of adders (AD.sub.i) with inputs for binary number bits of the same significance, which output intermediate sum and carry words that are combined to form sum words, are provided for the bit-parallel addition of binary numbers in two's complement with carry-save overflow correction. For the correction of overflow errors, the carry bit of the adder (AD.sub.n-2) having the second highest significance is replaced by the carry bit of the most significant adder (AD.sub.n-1) and, in case the carry bits of the two most significant adders (AD.sub.n-1, AD.sub.n-2) are unequal, the intermediate sum bit of the most significant adder (AD.sub.n-1) is replaced by the carry bit thereof. The element AD.sub.kn-1 has the same number of transistors as the other adders AD.sub.0 . . . AD.sub.n-2.