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. 16, 1991
Filed:
Apr. 30, 1990
Machio Segawa, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A semiconductor memory device having an improved digit line structure which is capable of carrying out a low-noise operation is disclosed. The semiconductor memory device has in each column a digit line pair and a sense amplifier connected to the digit line pair. Each pair of digit lines are composed of a plurality of first wirings formed of a first conductor layer and a plurality of second wirings formed of a second conductor layer isolated from the first conductor layer through an insulating layer. One of the digit lines of each digit line pair is formed by electrically connecting part of the first wiring and part of the second wiring, and the other digit line of the digit line pair is formed by electrically connecting the other part of the first wiring and the other part of the second wiring.