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    • 4. 发明授权
    • Nonvolatile semiconductor memory device
    • 非易失性半导体存储器件
    • US08576605B2
    • 2013-11-05
    • US13051766
    • 2011-03-18
    • Takahiko Sasaki
    • Takahiko Sasaki
    • G11C11/00
    • G11C29/02G11C8/08G11C13/0007G11C13/0028G11C13/004G11C13/0061G11C13/0064G11C13/0069G11C29/021G11C29/028G11C2029/1202G11C2213/71G11C2213/72
    • A nonvolatile semiconductor memory device according to an embodiment includes a memory cell array configured by plural memory cells each including a variable resistor and each provided between first and second lines. A control circuit applies to a memory cell through the first and second lines a writing voltage for writing data or a reading voltage for reading data. A sense amplifier circuit senses data retained in a memory cell based on a current flowing through the first line. In a data writing operation, the control circuit applies a writing voltage to each of n number of memory cells configuring one unit such that the memory cells may be supplied with different resistance values. In a data reading operation, the sense amplifier circuit compares level relationship of the resistance values of n number of memory cells configuring one unit and reads out n! patterns of data from the one unit.
    • 根据实施例的非易失性半导体存储器件包括由多个存储单元构成的存储单元阵列,每个存储单元包括可变电阻器,每个存储单元设置在第一和第二线路之间。 控制电路通过第一和第二行向存储器单元施加写入数据的写入电压或用于读取数据的读取电压。 感测放大器电路基于流过第一线路的电流来感测保存在存储器单元中的数据。 在数据写入操作中,控制电路对构成一个单元的n个存储单元中的每一个施加写入电压,使得可以向存储单元提供不同的电阻值。 在数据读取操作中,读出放大器电路比较构成一个单元的n个存储单元的电阻值的电平关系,并读出n! 来自一个单位的数据模式。
    • 5. 发明授权
    • Semiconductor memory device
    • 半导体存储器件
    • US08422269B2
    • 2013-04-16
    • US13033151
    • 2011-02-23
    • Takahiko SasakiTomonori Kurosawa
    • Takahiko SasakiTomonori Kurosawa
    • G11C11/00
    • G11C13/0069G11C13/0026G11C13/004G11C13/0064G11C2013/0083G11C2213/72
    • A control circuit applies a first voltage to selected one of first lines and applies a second voltage having a voltage value smaller than that of the first voltage to selected one of second lines, such that a certain potential difference is applied across a memory cell disposed at an intersection of the selected one of the first lines and the selected one of the second lines. A current limiting circuit sets a compliance current defining an upper limit of a cell current flowing in the memory cell, and controls such that the cell current flowing in the memory cell does not exceed the compliance current. The current limiting circuit comprises a current generating circuit and a first current mirror circuit. The current generating circuit generates a first current having a current value equal to a current value of the cell current at a certain timing multiplied by a certain constant. The first current mirror circuit mirrors the first current to a current path supplying the first voltage to the first lines.
    • 控制电路将第一电压施加到所选择的第一行中的一个,并将具有小于第一电压的电压值的第二电压施加到所选择的第二行中的一个,使得在设置在第二行的存储单元上施加一定的电位差 所选择的第一行和所选择的第二行之一的交集。 电流限制电路设定限定在存储单元中流动的电池电流的上限的顺从电流,并进行控制使得在存储单元中流动的电池电流不超过顺应性电流。 限流电路包括电流产生电路和第一电流镜电路。 电流产生电路产生具有等于电池电流当前值的电流值的第一电流,该电流值以某一定时乘以一定常数。 第一电流镜电路将第一电流反射到向第一线提供第一电压的电流路径。
    • 7. 发明授权
    • Resistance semiconductor memory device having a bit line supplied with a compensating current based on a leak current detected during a forming operation
    • 电阻半导体存储器件,其具有基于在成形操作期间检测到的漏电流而提供有补偿电流的位线
    • US08331177B2
    • 2012-12-11
    • US13051110
    • 2011-03-18
    • Takahiko Sasaki
    • Takahiko Sasaki
    • G11C29/00
    • G11C5/148G11C13/0026G11C13/0028G11C13/0069G11C2013/0083G11C2213/72
    • A semiconductor memory device includes a memory cell array, a first control circuit, and a second control circuit. The first control circuit is configured to apply a first voltage to a selected first line. The second control circuit is configured to apply a second voltage having a voltage value higher than that of the first voltage to a selected second line. The first control circuit includes a detecting circuit. The detecting circuit is configured to detect a leak current to flow from the second line to the first line through a memory cell during a forming operation for bringing the memory cell into a state that allows the memory cell to shift between a high resistance state and a low resistance state. The second control circuit includes a current supply circuit, and a compensating circuit. The current supply circuit is configured to supply a constant current to the second line during the forming operation. The compensating circuit is configured to supply a compensating current having the same current value as that of the leak current to the second line during the forming operation based on the leak current detected by the detecting circuit.
    • 半导体存储器件包括存储单元阵列,第一控制电路和第二控制电路。 第一控制电路被配置为将第一电压施加到所选择的第一线。 第二控制电路被配置为将具有高于第一电压的电压值的第二电压施加到所选择的第二线。 第一控制电路包括检测电路。 检测电路被配置为在形成操作期间检测泄漏电流从第二线路流过第一线路,以使存储器单元进入允许存储器单元在高电阻状态和 低电阻状态。 第二控制电路包括电流源电路和补偿电路。 电流供给电路被配置为在成形操作期间向第二线路提供恒定电流。 补偿电路被配置为基于由检测电路检测到的泄漏电流,在成形操作期间将具有与漏电流相同的电流值的补偿电流提供给第二线。