Invention Grant
US07995415B2 System and method for reducing power consumption during extended refresh periods of dynamic random access memory devices 有权
用于在动态随机存取存储器件的扩展刷新周期期间降低功耗的系统和方法

  • Patent Title: System and method for reducing power consumption during extended refresh periods of dynamic random access memory devices
  • Patent Title (中): 用于在动态随机存取存储器件的扩展刷新周期期间降低功耗的系统和方法
  • Application No.: US12082579
    Application Date: 2008-04-11
  • Publication No.: US07995415B2
    Publication Date: 2011-08-09
  • Inventor: Stephen L. Casper
  • Applicant: Stephen L. Casper
  • Applicant Address: US ID Boise
  • Assignee: Micron Technology, Inc.
  • Current Assignee: Micron Technology, Inc.
  • Current Assignee Address: US ID Boise
  • Agency: Dorsey & Whitney LLP
  • Main IPC: G11C7/00
  • IPC: G11C7/00
System and method for reducing power consumption during extended refresh periods of dynamic random access memory devices
Abstract:
A dynamic random access memory (“DRAM”) device is operable in either a normal refresh mode or a static refresh mode, such as a self-refresh mode. A cell plate voltage selector couples a voltage of one-half the supply voltage to the cell plate of a DRAM array in a normal refresh mode and in the static refresh mode when memory cells are being refreshed. In between refresh bursts in the static refresh mode, the cell plate voltage selector couples a reduced voltage to the cell plate. This reduces the voltage reduces the voltage across diode junctions formed between the source/drain of respective access transistor and the substrate. The reduced voltage reduces the discharge current flowing from memory cells capacitors, thereby allowing a reduction in the required refresh rate and a consequential reduction in power consumption.
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