Invention Grant
- Patent Title: Charge redistribution during erase in charge trapping memory
- Patent Title (中): 在电荷捕获存储器中的擦除期间的电荷再分配
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Application No.: US14851639Application Date: 2015-09-11
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Publication No.: US09406387B2Publication Date: 2016-08-02
- Inventor: Jiahui Yuan , Ching-Huang Lu , Yingda Dong
- Applicant: SanDisk Technologies Inc.
- Applicant Address: US TX Plano
- Assignee: SanDisk Technologies LLC
- Current Assignee: SanDisk Technologies LLC
- Current Assignee Address: US TX Plano
- Agency: Vierra Magen Marcus LLP
- Main IPC: G11C16/04
- IPC: G11C16/04 ; G11C16/14 ; G11C16/34 ; G11C16/16 ; G11C11/56 ; G11C16/26 ; H01L27/115

Abstract:
Techniques are provided to accelerate the redistribution of the holes in connection with an erase operation, so that there will be a reduced amount of redistribution of the holes after programming. As a result, short-term charge loss after programming is reduced. In one aspect, a positive control gate voltage is applied to a set of memory cells after erase and before programming. The positive control gate voltage has a relatively low amplitude and a long duration, compared to a programming voltage. The positive control gate voltage can be adjusted based on the erase depth of the memory cells and factors such as a count of program-erase cycles, a count of erase-verify iterations, sensing of a position of the lower tail, and a cross-sectional width of a vertical pillar of a memory hole.
Public/Granted literature
- US20160064090A1 Charge Redistribution During Erase In Charge Trapping Memory Public/Granted day:2016-03-03
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