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    • 3. 发明授权
    • NAND flash memory device and method of operating same to reduce a difference between channel potentials therein
    • NAND闪存器件及其操作方法以减少其中的沟道电位之间的差异
    • US08456918B2
    • 2013-06-04
    • US12405826
    • 2009-03-17
    • Dong-Yean OhWoon-Kyung LeeJai Hyuk SongChang-Sub Lee
    • Dong-Yean OhWoon-Kyung LeeJai Hyuk SongChang-Sub Lee
    • G11C11/34G11C16/06
    • G11C16/0483G11C16/10
    • An flash memory device includes a block of NAND cell units, each NAND cell unit in the block includes n memory cell transistors MC controlled by a plurality of n wordlines, and is connected in series between a string selection transistor SST connected to a bitline and a ground selection transistor GST. While a programming voltage Vpgm is applied to a selected wordline WL , a cutoff voltage Vss is applied to a nearby unselected wordline closer to the ground selection transistor GST to isolate a first local channel Ch1 from a second local channel Ch2. As the location i of the selected wordline WL increases close to the SST, the second channel potential Vch2 tends to increase excessively, causing errors. The excessive increase of Vch2 is prevented by modifying the voltages applied to string select lines (SSL) and/or to the bit lines (BL), or the pass voltages Vpass applied to the unselected wordlines (WL location i is equal or greater than a predetermined (stored) location number x. If incremental step pulse programming (ISPP) is implemented, the applied voltages are modified only if the ISPP loop count j is equal or greater than a predetermined (stored) critical loop number y.
    • 闪速存储器件包括一块NAND单元单元,该块中的每个NAND单元单元包括由多个n个字线控制的n个存储单元晶体管MC,并串联连接在连接到位线的串选择晶体管SST和 接地选择晶体管GST。 当编程电压Vpgm被施加到所选字线WL时,截止电压Vss被施加到靠近接地选择晶体管GST的附近未选字线,以将第一本地信道Ch1与第二本地信道Ch2隔离。 当所选择的字线WL i的位置i增加到接近于SST时,第二通道电位Vch2会过度增加,导致错误。 通过修改施加到串选择线(SSL)和/或位线(BL)的电压或施加到未选择字线(WL ),只有当所选择的字线WL i位置i等于或大于预定(存储的)位置号码x时。 如果实现增量步进脉冲编程(ISPP),只有当ISPP循环计数j等于或大于预定(存储)的关键循环数y时,才施加电压。
    • 10. 发明授权
    • NAND flash memory device and method of making same
    • NAND闪存器件及其制作方法
    • US08654585B2
    • 2014-02-18
    • US13553242
    • 2012-07-19
    • Dong-Yean OhWoon-Kyung LeeSeung-Chul Lee
    • Dong-Yean OhWoon-Kyung LeeSeung-Chul Lee
    • G11C11/34
    • G11C16/10G11C16/0483G11C16/3454
    • An integrated circuit includes a NAND string including a string selection transistor SST and a ground selection transistor GST disposed at either end of series-connected memory storage cells MC. Each of the memory storage cells is a memory transistor having a floating gate, and at least one of the string selection transistor SST and the ground selection transistor GST is a memory transistor having a floating gate. The threshold voltage Vth of programmable string selection transistors SST and the ground selection transistor GST is variable and user controllable and need not be established by implantation during manufacture. Each of the programmable string selection transistors SST and the ground selection transistors GST in a memory block may be used to store random data, thus increasing the memory storage capacity of the flash memory device.
    • 集成电路包括一个包括串选择晶体管SST的NAND串和设置在串联存储单元MC的任一端的接地选择晶体管GST。 每个存储器存储单元是具有浮置栅极的存储晶体管,并且串选择晶体管SST和接地选择晶体管GST中的至少一个是具有浮置栅极的存储晶体管。 可编程串选择晶体管SST和接地选择晶体管GST的阈值电压Vth是可变的并且用户可控,并且不需要在制造期间通过注入建立。 存储器块中的每个可编程串选择晶体管SST和接地选择晶体管GST可用于存储随机数据,从而增加闪存器件的存储器存储容量。