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:
May. 27, 2008
Filed:
Dec. 14, 2005
Seong Je Park, Suwon-si, KR;
Seung Ho Chang, Chungcheongbuk-do, KR;
Seong Je Park, Suwon-si, KR;
Seung Ho Chang, Chungcheongbuk-do, KR;
Hynix Semiconductor Inc., Icheon-si, KR;
Abstract
A program operation and a program verification operation are repeatedly performed. The program verification operation is performed on memory cells including pass cells to obtain a uniform distribution characteristic of a threshold voltage. Furthermore, the program verification operation is performed with a compare voltage being set higher than a target voltage initially so that a threshold voltage of a memory cell is sufficiently higher than the target voltage. The program verification operation is again performed lowering the compare voltage according to the repetition number. Thus, normally programmed cells are prevented from being again excessively programmed.