Invention Grant
US07768826B2 Methods for partitioned erase and erase verification in non-volatile memory to compensate for capacitive coupling effects
有权
用于在非易失性存储器中分区擦除和擦除验证以补偿电容耦合效应的方法
- Patent Title: Methods for partitioned erase and erase verification in non-volatile memory to compensate for capacitive coupling effects
- Patent Title (中): 用于在非易失性存储器中分区擦除和擦除验证以补偿电容耦合效应的方法
-
Application No.: US12358633Application Date: 2009-01-23
-
Publication No.: US07768826B2Publication Date: 2010-08-03
- Inventor: Fumitoshi Ito
- Applicant: Fumitoshi Ito
- Applicant Address: US CA Milpitas
- Assignee: SanDisk Corporation
- Current Assignee: SanDisk Corporation
- Current Assignee Address: US CA Milpitas
- Agency: Vierra Magen Marcus & DeNiro LLP
- Main IPC: G11C16/16
- IPC: G11C16/16

Abstract:
A set of memory cells can be erased by individually erasing portions of the set in order to normalize the erase behavior of each memory cell and provide more consistent erase rates. An erase voltage pulse can be applied to the set of memory cells with a first group of cells biased for erase and a second group biased to inhibit erase. A second erase voltage pulse can then be applied with the second group biased for erase and the first group biased to inhibit erase. The groups are chosen so that the erase potentials for the cells in the first subset during the first pulse are about equal, so that the erase potentials for the cells in the second subset during the second pulse are about equal, and so that the erase potentials for the cells of the first subset are about the same as the erase potentials for the cells of the second subset. In one embodiment, the bias conditions for the string during each individual erase are selected so that every memory cell of the set will experience similar capacitive coupling effects from neighboring transistors.
Public/Granted literature
- US20090180325A1 Partitioned Erase And Erase Verification In Non-Volatile Memory Public/Granted day:2009-07-16
Information query