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:
Nov. 21, 2000
Filed:
Apr. 16, 1999
Isao Naritake, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a dynamic type semiconductor memory device having a classified bit line structure, a feedback capacitor is provided between sub-bit lines and main bit lines of a sub-sense amplifier. A voltage difference read out on the sub-bit lines is transferred to the main bit lines, the read out voltage difference is amplified by a main sense amplifier, and data of superordinate bits is read out. At the same time, the data on said main bit lines is feed-backed to the sub-bit lines through the capacitor. Thereafter, a reading operation from the sub-bit lines to the main bit lines is performed again, thereby enabling a reading operation for data of subordinate bits. Thus, in a dynamic type semiconductor memory device having a conventional memory cell structure, data for two bits can be stored in one memory cell.