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:
Apr. 07, 1992
Filed:
Feb. 02, 1990
Abstract
A sum-of-products calculating circuit includes a bit extension circuit, wherein the most significant bit of an intermediate result of the multiplication effected by a multiplier is extended from an order one bit of the order higher than that of the most significant bit of the intermediate result of the multiplication to the sign bit of addition input data to an adder, by using the most significant bit of each of two intermediate results of the multiplication effected by a multiplier and the sign bit of each of multiplication input data to the multiplier. The data having the extended data bits are inputted to an adder as addition data for the addition performed therein. Thereby, the number of bits used for representing output data of the multiplier can be equalized with that of bits used for representing input data of the adder by a simple logic circuit without the addition of dummy bits to the addition data. Thus, the component elements of the calculating circuit is substantially reduced in number.