Invention Grant
- Patent Title: Method of reducing injection type of program disturb during program pre-charge in memory device
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Application No.: US16418642Application Date: 2019-05-21
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Publication No.: US10770157B1Publication Date: 2020-09-08
- Inventor: Hong-Yan Chen , Wei Zhao , Henry Chin
- Applicant: SanDisk Technologies LLC
- Applicant Address: US TX Addison
- Assignee: SanDisk Technologies LLC
- Current Assignee: SanDisk Technologies LLC
- Current Assignee Address: US TX Addison
- Agency: Vierra Magen Marcus LLP
- Main IPC: G11C16/34
- IPC: G11C16/34 ; G11C16/04 ; G11C16/08 ; G11C16/24 ; G11C16/10

Abstract:
Techniques are described for reducing an injection type of program disturb in a memory device during the pre-charge phase of a program loop. In one approach, a pre-charge voltage on the selected word line and drain side word lines is adjusted based on a risk of the injection type of program disturb. Risk factors such as temperature, WLn position, Vpgm and the selected sub-block, can be used to set the pre-charge voltage to be lower when the risk is higher. In another approach, the pre-charge voltage on the source side word lines is adjusted to reduce a channel gradient and/or the amount of time in which the injection type of program disturb occurs.
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