Invention Grant
- Patent Title: Negative voltage wordline methods and systems
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Application No.: US16455872Application Date: 2019-06-28
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Publication No.: US10832778B1Publication Date: 2020-11-10
- Inventor: Xiang Yang , Huai-yuan Tseng , Deepanshu Dutta
- 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: Dickinson Wright PLLC
- Agent Steven Hurles
- Main IPC: G11C16/08
- IPC: G11C16/08 ; G11C16/24 ; G11C16/04

Abstract:
A methodology and structure for driving a selected wordline to a negative voltage without the need for a negative wordline voltage generator. The methodology includes the step of boosting a non-selected wordline to a first positive voltage. The methodology proceeds with holding a selected wordline, which is adjacent to and capacitively coupled with the non-selected wordline, at zero voltage. The methodology continues with floating the selected wordline. The methodology proceeds with driving the non-selected wordline to a lower voltage to shift the selected wordline to less than zero volts due to capacitance effects. The methodology continues with the step of accelerating charge loss in a defective memory cell connected to the selected wordline while at a negative voltage during a soft erase operation.
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