Invention Grant
US08400839B2 Nonvolatile memory and method for compensating during programming for perturbing charges of neighboring cells 有权
非易失性存储器和用于在编程期间补偿相邻电池的扰动电荷的方法

  • Patent Title: Nonvolatile memory and method for compensating during programming for perturbing charges of neighboring cells
  • Patent Title (中): 非易失性存储器和用于在编程期间补偿相邻电池的扰动电荷的方法
  • Application No.: US13029787
    Application Date: 2011-02-17
  • Publication No.: US08400839B2
    Publication Date: 2013-03-19
  • Inventor: Yan Li
  • Applicant: Yan Li
  • Applicant Address: US CA Milpitas
  • Assignee: SanDisk Corporation
  • Current Assignee: SanDisk Corporation
  • Current Assignee Address: US CA Milpitas
  • Agency: Davis Wright Tremaine LLP
  • Main IPC: G11C16/04
  • IPC: G11C16/04
Nonvolatile memory and method for compensating during programming for perturbing charges of neighboring cells
Abstract:
Shifts in the apparent charge stored on a charge storing element of a non-volatile memory cell can occur because of the coupling of an electric field based on the charge stored in adjacent charge storing elements. To compensate for this coupling, the programming process for a given memory cell can take into account the target programmed state of one or more adjacent memory cell. The amount of programming is verified after each programming pulse and the standard verify level for the programming cell is dependent on the target state. The verify level is further offset lower dependent on the amount of perturbation from neighboring cells, determinable by their target states. The verify level is preferably virtually offset by biasing adjacent word lines instead of actually offsetting the standard verify level. For soft-programming erased cells, neighboring cells on both adjacent word lines are taken into account.
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