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    • 6. 发明公开
    • Semiconductor memory cell and memory array with inversion layer
    • Halbleiterspeicherzelle und Speicherfeld mit einer Inversionsschicht。
    • EP0531707A2
    • 1993-03-17
    • EP92113264.3
    • 1992-08-04
    • INTERNATIONAL BUSINESS MACHINES CORPORATION
    • Kauffmann, Bruce AlanLam, Chung HonLasky, Jerome Brett
    • H01L27/115G11C16/02
    • H01L27/115
    • A memory cell (10, 50), suitable for electrically erasable programmable read only memories (EEPROMs), which has direct write cell capability is disclosed. The memory cell (10, 50) is fabricated on a substrate (12, 52) and uses an inversion source gate (18, 54) disposed above the substrate (12, 52) to generate a depletion source (IS) therein. The depletion source (IS) defines a channel region in the substrate (12, 52) with an associated drain (14, ID). An electrically isolated floating gate (26, 62) is disposed above the substrate (12, 52) so as to overlap at least a portion of the substrate channel region. Further, a program gate (30, 66) is disposed to overlap a portion of the floating gate (26, 62) and an access gate (34, 70) is also provided aligned at least partially over the substrate channel region such that a dual gate device is defined. An array of such memory cells (10, 50) is also disclosed.
    • 公开了一种适用于具有直接写入单元能力的电可擦除可编程只读存储器(EEPROM)的存储单元(10,50)。 存储单元(10,50)被制造在衬底(12,52)上,并且使用设置在衬底(12,52)上方的反相源栅极(18,54)在其中产生耗尽源(IS)。 耗尽源(IS)在衬底(12,52)中限定具有相关联的漏极(14,ID)的沟道区域。 电隔离的浮动栅极(26,62)设置在衬底(12,52)上方,以便与衬底沟道区域的至少一部分重叠。 此外,程序门(30,66)设置成与浮置栅极(26,62)的一部分重叠,并且还提供对准至少部分地在衬底沟道区域上方的存取栅极(34,70),使得双重 定义门设备。 还公开了这种存储器单元(10,50)的阵列。