Invention Grant
US07453732B2 Method for programming memory cells including transconductance degradation detection 有权
用于编程存储器单元的方法,包括跨导劣化检测

  • Patent Title: Method for programming memory cells including transconductance degradation detection
  • Patent Title (中): 用于编程存储器单元的方法,包括跨导劣化检测
  • Application No.: US11742334
    Application Date: 2007-04-30
  • Publication No.: US07453732B2
    Publication Date: 2008-11-18
  • Inventor: Jean Devin
  • Applicant: Jean Devin
  • Applicant Address: FR Montrouge
  • Assignee: STMicroelectronics SA
  • Current Assignee: STMicroelectronics SA
  • Current Assignee Address: FR Montrouge
  • Agency: Seed IP Law Group PLLC
  • Agent Lisa K. Jorgenson; Eric M. Ringer
  • Priority: FR0409215 20040831
  • Main IPC: G11C11/34
  • IPC: G11C11/34
Method for programming memory cells including transconductance degradation detection
Abstract:
The present invention relates to a method for programming a memory cell having a determined transconductance curve. The programming of the memory cell comprises a series of programming cycles each comprising a step of verifying the state of the memory cell. According to the present invention, the verify step comprises a first read of the memory cell with a first read voltage greater than a reference threshold voltage, and a second read of the memory cell with a second read voltage lower than or equal to the reference threshold voltage. The memory cell is considered not to be in the programmed state if first- and second-read currents flowing through the memory cell are above determined thresholds, and programming voltage pulses are applied to the memory cell while the latter is not in the programmed state. Application in particular to the programming of Flash memory cells.
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