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:
Jul. 01, 1986
Filed:
Sep. 24, 1984
Peter S Bernardson, Tempe, AZ (US);
GTE Communications Systems Corporation, Phoenix, AZ (US);
Abstract
A modulo 2.sup.2n -1 adder employing adders which may all be standard binary adders. A first binary adder sums binary input signals a and b to produce a first sum signal in which the n+2 more significant bits represent the integer part of (a+b)/2.sup.2n (i.e., of a+b taken modulo 2.sup.2n). A second binary adder subtracts these n+2 more significant bits from a 2n bit shifted (less significant bits) version thereof for producing a first difference signal which is subtracted from the first sum signal in a third binary adder to produce a binary signal R. The signal R is applied to one input of a fourth binary adder which produces the desired modulo 2.sup.2n -1 signal. A comparator circuit applies a constant (2.sup.2n -1) to a difference input of the fourth binary adder only when R is greater than or equal to this constant.