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:
Mar. 28, 2006
Filed:
Nov. 04, 2004
Wing-han Leung, Sunnyvale, CA (US);
Richard M. Fastow, Cupertino, CA (US);
Yue-song He, San Jose, CA (US);
Sheung-hee Park, Pleasanton, CA (US);
Wing-Han Leung, Sunnyvale, CA (US);
Richard M. Fastow, Cupertino, CA (US);
Yue-Song He, San Jose, CA (US);
Sheung-Hee Park, Pleasanton, CA (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
A method of erasing bits in a multi-level cell flash memory array is described. The method includes applying over-erase verification after each erase pulse. If cells verify as over-erased, a ramped over-erase correction pulse is applied. The voltage of each over-erase correction pulse is incrementally greater than the previous pulse, until all bits in all cells pass the over-erase verification. In this way, the widths of the threshold voltage distributions of the erased bits are kept to a minimum.