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:
Jun. 30, 1998
Filed:
Nov. 27, 1996
Applicant:
Inventors:
Robert B Richart, Austin, TX (US);
Shyam Garg, Austin, TX (US);
Assignee:
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
3651852 ; 36518503 ; 36518524 ; 365210 ;
Abstract
A reference cell in a nonvolatile memory is electrically erasable and the electrically erasable character of the memory is exploited to expand the voltage range over which a differential amplifier is useful for sensing the state of a bit. Selected elements of a reference cell are electrically erased and reprogrammed for accurately tuning the sensing of multiple data states in a memory cell. For example, 64 or more data states may be tuned so that a single megabyte of memory is allocated to store six megabytes of information.