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    • 4. 发明授权
    • Steering gate and bit line segmentation in non-volatile memories
    • 非易失性存储器中的转向门和位线分割
    • US06532172B2
    • 2003-03-11
    • US09871333
    • 2001-05-31
    • Eliyahou HarariGeorge SamachisaDaniel C. GutermanJack H. Yuan
    • Eliyahou HarariGeorge SamachisaDaniel C. GutermanJack H. Yuan
    • G11C1604
    • G11C7/18G11C7/12G11C16/0433G11C16/0458G11C16/0491
    • Steering and bit lines (of a flash EEPROM system, for example) are segmented along columns of a memory cell array. In one embodiment, the steering and bit lines of one of their segments are connected at a time to respective global steering and bit lines. The number of rows of memory cells included in individual steering gate segments is a multiple of the number of rows included in individual bit line segments in order to have fewer steering gate segments. This saves considerable circuit area by reducing the number of segment selecting transistors necessary for the steering gates, since these transistors must be larger than those used to select bit line segments in order to handle higher voltages. In another embodiment, local steering gate line segments are combined in order to reduce their number, and the reduced number of each segment is then connected directly with an address decoder, without the necessity of a multiplicity of large switching transistors outside of the decoder to select the segment.
    • 转向和位线(例如,闪存EEPROM系统)沿着存储单元阵列的列进行分段。 在一个实施例中,其一个段的转向和位线一次连接到相应的全局转向和位线。 包括在各个转向门段中的存储单元的行数是单个位线段中包括的行数的倍数,以便具有较少的转向门段。 这通过减少转向门所需的段选择晶体管的数量来节省相当大的电路面积,因为这些晶体管必须大于用于选择位线段以用于处理较高电压的晶体管。 在另一个实施例中,组合本地导向门线段以便减少它们的数量,然后每个段的减少的数量直接与地址解码器相连,而不需要在解码器之外的多个大的开关晶体管来选择 该段。
    • 5. 发明授权
    • Dual floating gate EEPROM cell array with steering gates shared adjacent cells
    • 具有转向门的双浮栅EEPROM单元阵列共享相邻单元
    • US06266278B1
    • 2001-07-24
    • US09634694
    • 2000-08-08
    • Eliyahou HarariDaniel C. GutermanGeorge SamachisaJack H. Yuan
    • Eliyahou HarariDaniel C. GutermanGeorge SamachisaJack H. Yuan
    • G11C1604
    • G11C16/0475G11C11/5621G11C11/5628G11C11/5635G11C11/5642G11C16/0458G11C2211/5612H01L27/115
    • An EEPROM system having an array of memory cells that individually include two floating gates, bit line source and drain diffusions extending along columns, steering gates also extending along columns and select gates forming word lines along rows of floating gates. The dual gate cell increases the density of data that can be stored. Rather than providing a separate steering gate for each column of floating gates, an individual steering gate is shared by two adjacent columns of floating gates that have a diffusion between them. The steering gate is thus shared by two floating gates of different but adjacent memory cells. In one array embodiment, the floating gates are formed on the surface of the substrate, where the added width of the steering gates makes them easier to form, removes them as a limitation upon scaling the array smaller, require fewer electrical contacts along their length because of increased conductance, are easier to contact, and reduces the number of conductive traces that are needed to connect with them. In arrays that erase the floating gates to the select gates, rather than to the substrate, the wider steering gates advantageously uncouple the diffusions they cover from the select gates. This use of a single steering gate for two floating gates also allows the floating gates, in another embodiment, to be formed on side walls of trenches in the substrate with the common steering gate between them, to further increase the density of data that can be stored. Multiple bits of data can also be stored on each floating gate.
    • 具有存储单元阵列的EEPROM系统,其独立地包括两个浮动栅极,沿列延伸的位线源极和漏极扩散,还沿着列延伸的转向栅极以及沿着浮动栅极行沿着形成字线的选择栅极。 双门单元增加了可以存储的数据的密度。 不是为每列浮动栅栏提供单独的转向门,而是由两个相邻的悬浮门之间共享一个单独的转向门,这两个浮动门在它们之间具有扩散。 因此,转向门由不同但相邻的存储单元的两个浮动门共享。 在一个阵列实施例中,浮动栅极形成在基板的表面上,其中增加的转向门的宽度使得它们更容易形成,作为对阵列的缩小的限制,将它们移除,因为它们的尺寸较小,因此需要更少的沿着它们的长度的电触点,因为 增加电导,更容易接触,并减少与它们连接所需的导电迹线的数量。 在将浮动栅极擦除到选择栅极而不是衬底的阵列中,较宽的转向栅极有利地使其从选择栅极覆盖的扩散分离。 单个转向门用于两个浮动栅极的这种使用也允许浮动栅极在另一个实施例中形成在衬底中的沟槽的侧壁上,其间具有公共转向栅极,以进一步增加数据的密度 存储。 多个数据位也可以存储在每个浮动门上。