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. 03, 1999
Filed:
Feb. 10, 1997
Toshiaki Inoue, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An adder has a carry signal generation block for producing carry generation signal bits representative of carry bits resulted from augend signal bits and addend signal bits and carry propagation signal bits representative of carry bits resulted from the augend signal bits, the addend signal bits and the carry bits supplied from lower-digits, a carry propagation block responsive to control signal bits for dividing the adder into partial adders and having propagation stages for producing carry signal bits from the carry generation signal bits, the carry propagation signal bits and the control signal bits, and a sum generation block for producing sum signal bits from the carry propagation signal bits, the control signal bits and the carry signal bits, and is divisible into an arbitrary number of partial adders without increase the stages of a critical path.