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    • 3. 发明申请
    • DATA STATE-BASED TEMPERATURE COMPENSATION DURING SENSING IN NON-VOLATILE MEMORY
    • 在非易失性存储器中感测期间基于数据状态的温度补偿
    • WO2010033409A1
    • 2010-03-25
    • PCT/US2009/056405
    • 2009-09-09
    • SANDISK CORPORATIONDUNGA, Mohan, V.HIGASHITANI, Masaaki
    • DUNGA, Mohan, V.HIGASHITANI, Masaaki
    • G11C11/56G11C16/26
    • G11C11/5642G11C7/04G11C16/26
    • 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 (1) is provided for each data state (2), so that a common temperature coefficient (3) 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.
    • 通过在验证和读取操作期间提供数据状态相关的和可选的与温度相关的感测电流来解决非易失性存储设备中的温度效应。 为每个数据状态(2)提供不同的感测电流(1),使得对于具有不同数据状态的存储元件实现共同的温度系数(3)。 较高状态的温度系数可以降低到较低的状态。 在感测期间,当所选择的存储元件处于导通状态时,可以调整感测时间以实现期望的感测电流。 可以保持固定的电压跳变点。 在感测时间期间,当所选存储元件处于导通状态时,预充电电容器通过位线和NAND串放电到选定的存储元件中。 将放电电平转换为与状态相关的,并且可选地与温度相关的参考电流进行比较的电流。