BACK BIAS DURING PROGRAM VERIFY OF NON-VOLATILE STORAGE

Title:

BACK BIAS DURING PROGRAM VERIFY OF NON-VOLATILE STORAGE

Document Type and Number:

WIPO Patent Application WO/2014/160619

Kind Code:

A3

Abstract:

Different back bias (or body bias) conditions are applied to a non-volatile storage system during different program verify operations of a programming operation. A back bias may be applied during verify of an intermediate state (e.g., a lower page, middle page). The intermediate state is a state that exists during a program operation, but is not one of the final states. A lower back bias or no back bias is applied during verify of a final state (e.g., an upper page). Thus, a different back bias may be used when verifying an intermediate state than the back bias used when verifying a final state. Using the back bias makes it easier to verify a low VTH, such as a negative VTH. Also, using the back bias is effective at dealing with sense amplifier headroom issues.

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Inventors:

ITO FUMITOSHI (US)

Application Number:

PCT/US2014/031524

Publication Date:

November 20, 2014

Filing Date:

March 22, 2014

Export Citation:

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Assignee:

SANDISK TECHNOLOGIES INC (US)

International Classes:

G11C11/56; G11C16/34

Foreign References:

US20110157997A1	2011-06-30
US20080198660A1	2008-08-21
US20070253272A1	2007-11-01

Attorney, Agent or Firm:

MAGEN, Burt (575 Market Street Suite 375, San Francisco California, US)

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