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    • 3. 发明公开
    • Semiconductor device
    • 半导体器件
    • EP2428959A1
    • 2012-03-14
    • EP11180109.8
    • 2011-09-06
    • Semiconductor Energy Laboratory Co, Ltd.
    • Matsuzaki, TakanoriNagatsuka, ShuheiInoue, Hiroki
    • G11C8/08G11C11/403G11C11/405G11C11/408G11C16/02
    • H01L27/1052G11C8/08G11C11/403G11C11/405G11C11/4085G11C16/02G11C16/0433G11C16/0483G11C16/08G11C2211/4016
    • A semiconductor device in which stored data can be held even when power is not supplied and there is no limitation on the number of writing operations is provided. A semiconductor device is formed using a material which can sufficiently reduce the off-state current of a transistor, such as an oxide semiconductor material that is a wide-gap semiconductor. When a semiconductor material which can sufficiently reduce the off-state current of a transistor is used, the semiconductor device can hold data for a long period. In addition, by providing a capacitor or a noise removal circuit electrically connected to a write word line, a signal such as a short pulse or a noise input to a memory cell can be reduced or removed. Accordingly, a malfunction in which data written into the memory cell is erased when a transistor in the memory cell is instantaneously turned on can be prevented.
    • 提供一种半导体器件,其中即使没有供电也可以保持存储的数据,并且不限制写入操作的次数。 使用能够充分降低作为宽带隙半导体的氧化物半导体材料等晶体管的截止电流的材料来形成半导体装置。 当使用能够充分降低晶体管的截止状态电流的半导体材料时,半导体器件可以长时间保存数据。 另外,通过提供电连接到写入字线的电容器或噪声去除电路,可以减少或去除输入到存储器单元的诸如短脉冲或噪声的信号。 因此,可以防止当存储器单元中的晶体管瞬时导通时写入存储器单元的数据被擦除的故障。
    • 4. 发明公开
    • Dynamic random access memory device and method for self-refreshing memory cells with temperature compensated self-refresh
    • 自动刷新自动刷新von Speicherzellen mit temperaturkompensiertem自刷新
    • EP2405440A1
    • 2012-01-11
    • EP11007526.4
    • 2007-03-30
    • MOSAID Technologies Incorporated
    • Pyeon, Hong Beom
    • G11C11/406G11C11/403
    • G11C11/406G11C7/04G11C11/40611G11C11/40615G11C11/40626G11C2211/4061
    • A dynamic random access memory (DRAM) device has an array of DRAM cells of rows by columns. Each DRAM cell of the array is coupled with a wordline of a corresponding row and a bitline of a corresponding column. An entry into and an exit from the self-refresh mode are detected by a mode detector and a self-refresh mode signal is provided. An oscillation circuit generates in response to the self-refresh mode signal generates a basic time period. A first frequency divider/time period multiplier changes the basic time period in accordance with a process variation factor relating to the DRAM device. A second frequency divider/time period multiplier further changes the changed time period in accordance with a temperature change factor. relating to the DRAM device. In the self-refresh mode, data stored in the DRAM cells is refreshed. In accordance with the two factors, the DRAM devices perform and achieve reliable self-refresh for variable DRAM cell retention time.
    • 动态随机存取存储器(DRAM)器件具有逐列的DRAM单元阵列。 阵列的每个DRAM单元与相应列的相应行和位线的字线耦合。 通过模式检测器检测进入和退出自刷新模式,并提供自刷新模式信号。 响应于自刷新模式信号产生的振荡电路产生基本时间段。 第一分频器/时间周期乘法器根据与DRAM器件有关的过程变化因素来改变基本时间周期。 第二分频器/时间周期乘法器根据温度变化因子进一步改变改变的时间段。 涉及DRAM设备。 在自刷新模式下,存储在DRAM单元中的数据被刷新。 根据这两个因素,DRAM器件执行并实现可变DRAM单元保留时间的可靠的自刷新。