- 专利标题: Alternate sensing techniques for non-volatile memories
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申请号: US12023317申请日: 2008-01-31
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公开(公告)号: US07460406B2公开(公告)日: 2008-12-02
- 发明人: Nima Mokhlesi , Jeffrey W. Lutze
- 申请人: Nima Mokhlesi , Jeffrey W. Lutze
- 申请人地址: US CA Milpitas
- 专利权人: SanDisk Corporation
- 当前专利权人: SanDisk Corporation
- 当前专利权人地址: US CA Milpitas
- 代理机构: Davis Wright Tremaine LLP
- 主分类号: G11C11/34
- IPC分类号: G11C11/34
摘要:
The present invention presents a scheme for sensing memory cells. Selected memory cells are discharged through their channels to ground and then have a voltage level placed on the traditional source and another voltage level placed on the control gate, and allowing the cell bit line to charge up. The bit line of the memory cell will then charge up until the bit line voltage becomes sufficiently high to shut off any further cell conduction. The rise of the bit line voltage will occur at a rate and to a level dependent upon the data state of the cell, and the cell will then shut off when the bit line reaches a high enough level such that the body effect affected memory cell threshold is reached, at which point the current essentially shuts off. A particular embodiment performs multiple such sensing sub-operations, each with a different control gate voltage, but with multiple states being sensed in each operation by charging the previously discharged cells up through their source.
公开/授权文献
- US20080123414A1 Alternate Sensing Techniques for Non-Volatile Memories 公开/授权日:2008-05-29
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