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:
Aug. 07, 2001
Filed:
Dec. 29, 1999
Soo-Hwan Choi, Suwon, KR;
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
A semiconductor memory device having a plurality of reference cells for detecting states of and verifying written data in plurality of memory cells includes a memory cell array formed of the plurality of memory cells and a reference cell array formed of a plurality of units, each unit formed of the plurality of reference cells, reference cell having a same size as that of each memory cell. A sense amplifier circuit detects a difference between current flowing through a memory cell and a corresponding reference cell. Each unit in the reference cell array is formed of a plurality of the reference cells serially connected between the sense amplifier circuit and a control circuit for controlling the reference cells.