Auto adjusting window placement scheme for an NROM virtual ground array
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 24, 2001
Grant Date -
N/A
app pub date -
Apr 26, 2000
filing date -
Jan 28, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A virtual ground array based flash memory device includes a virtual ground array containing individual memory elements with supporting input/output circuitry. The threshold voltages of the memory elements gradually increase over operating cycles due to trapping of charge in the nitride or oxide, eventually causing errors due to the increase in threshold voltage. Internal routines are necessary to characterize the change in threshold voltages and subsequently modify the comparison circuit supplying the current used to determine whether the memory elements have attained a specific threshold. The method of automatically adjusting the window of the virtual ground array increases endurance and reliability of the virtual ground array and decreases errors caused by the increased threshold voltage.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully