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:
Feb. 03, 1987
Filed:
Mar. 07, 1984
Applicant:
Inventors:
Katsutaka Kimura, Sagamihara, JP;
Ryoichi Hori, Tokyo, JP;
Kiyoo Ito, Higashikurume, JP;
Hideo Sunami, Tokyo, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365149 ; 365210 ; 365186 ; 357 55 ;
Abstract
In a semiconductor memory device including memory and dummy cells connected to groups of data lines, word lines and dummy word lines for selecting the memory and dummy cells, respectively, and a signal detector for differentially amplifying the read signal from the memory cell selected by the signal of the word line and a reference signal from the dummy cell, the improvement wherein the memory cell capacitor consists of two capacitors, each having substantially the same structure as a dummy cell capacitor and connected in parallel with the other.