Invention Grant
- Patent Title: Non-volatile memory read operations using compensation currents
- Patent Title (中): 使用补偿电流的非易失性存储器读取操作
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Application No.: US11675545Application Date: 2007-02-15
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Publication No.: US07656713B2Publication Date: 2010-02-02
- Inventor: Raul-Adrian Cernea
- Applicant: Raul-Adrian Cernea
- 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: G11C11/34
- IPC: G11C11/34

Abstract:
Shifts in the apparent charge stored on a floating gate of a non-volatile memory cell can occur because of coupling of an electric field based on the charge stored in adjacent floating gates. The shift in apparent charge can lead to erroneous readings by raising the apparent threshold voltage, and consequently, lowering the sensed conduction current of a memory cell. The read process for a selected memory cell takes into account the state of one or more adjacent memory cells. If an adjacent memory cell is in one or more of a predetermined set of programmed states, a compensation current can be provided to increase the apparent conduction current of the selected memory cell. An initialization voltage is provided to the bit line of the programmed adjacent memory cell to induce a compensation current between the bit line of the programmed adjacent memory cell and the bit line of the selected memory cell.
Public/Granted literature
- US20070133297A1 NON-VOLATILE MEMORY READ OPERATIONS USING COMPENSATION CURRENTS Public/Granted day:2007-06-14
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