发明授权
US07755946B2 Data state-based temperature compensation during sensing in non-volatile memory
有权
在非易失性存储器中感测时的数据状态温度补偿
- 专利标题: Data state-based temperature compensation during sensing in non-volatile memory
- 专利标题(中): 在非易失性存储器中感测时的数据状态温度补偿
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申请号: US12233950申请日: 2008-09-19
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公开(公告)号: US07755946B2公开(公告)日: 2010-07-13
- 发明人: Mohan V. Dunga , Masaaki Higashitani
- 申请人: Mohan V. Dunga , Masaaki Higashitani
- 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: Vierra Magen Marcus & DeNiro LLP
- 主分类号: G11C16/00
- IPC分类号: G11C16/00
摘要:
Temperature effects in a non-volatile storage device are addressed by providing a data state-dependent, and optionally temperature dependent, sense current during verify and read operations. A different sense current is provided for each data state, so that a common temperature coefficient is realized for storage elements with different data states. The temperature coefficient for higher states can be reduced to that of lower states. During sensing, a sense time can be adjusted to achieve a desired sense current when a selected storage element is in a conductive state. A fixed voltage trip point may be maintained. During the sense time, a pre-charged capacitor discharges into a selected storage element such as via a bit line and NAND string, when the selected storage element is in a conductive state. The discharge level is translated to a current which is compared to a state-dependent, and optionally temperature dependent, reference current.
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