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    • 8. 发明申请
    • Nonvolatile semiconductor memory device having reduced dependency of a source resistance on a position in an array
    • 非易失性半导体存储器件具有降低源极电阻对阵列中位置的依赖性
    • US20060158932A1
    • 2006-07-20
    • US11329036
    • 2006-01-11
    • Satoru TamadaYuichi KunoriFumihiko Nitta
    • Satoru TamadaYuichi KunoriFumihiko Nitta
    • G11C16/06
    • G11C16/26
    • A dummy cell having a low threshold voltage is disposed in a memory cell array in alignment with a memory cell. A dummy cell with a low threshold voltage adjacent to a selected memory cell column is selected, and a source-side local bit line of the selected memory cell is coupled to a global bit line via such dummy cell. Since the source-side local bit line is coupled to a ground node at its both ends, source resistance of the memory cell can be reduced, and dependency of the source resistance of the memory cell on the position within the memory cell array can also be reduced. This allows for reducing dependency of source resistance of a memory cell on the position within the memory cell array and on the temperature in a nonvolatile semiconductor memory device.
    • 具有低阈值电压的虚拟单元被布置在与存储单元对准的存储单元阵列中。 选择与所选存储单元列相邻的具有低阈值电压的虚拟单元,并且所选择的存储单元的源极局部位线通过这样的虚设单元耦合到全局位线。 由于源极本地位线在其两端耦合到接地节点,所以可以减小存储器单元的源极电阻,并且存储单元的源极电阻对存储单元阵列内的位置的依赖性也可以是 减少 这允许减小存储器单元的源电阻对存储单元阵列内的位置和非易失性半导体存储器件中的温度的依赖性。