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    • 58. 发明授权
    • SRAM cells with two P-well structure
    • 具有两个P阱结构的SRAM单元
    • US06677649B2
    • 2004-01-13
    • US09565535
    • 2000-05-05
    • Kenichi OsadaMasataka MinamiShuji IkedaKoichiro Ishibashi
    • Kenichi OsadaMasataka MinamiShuji IkedaKoichiro Ishibashi
    • H01L2976
    • H01L27/1104G11C11/412G11C11/417H01L27/11H01L29/4916H01L29/783Y10S257/904
    • Prior known static random access memory (SRAM) cells are required that a diffusion layer be bent into a key-like shape in order to make electrical contact with a substrate with a P-type well region formed therein, which would result in a decrease in asymmetry leading to occurrence of a problem as to the difficulty in micro-patterning. To avoid this problem, the P-type well region in which an inverter making up an SRAM cell is formed is subdivided into two portions, which are disposed on the opposite sides of an N-type well region NW1 and are formed so that a diffusion layer forming a transistor has no curvature while causing the layout direction to run in a direction parallel to well boundary lines and bit lines. At intermediate locations of an array, regions for use in supplying power to the substrate are formed in parallel to word lines in such a manner that one regions is provided per group of thirty two memory cell rows or sixty four cell rows.
    • 现有的已知的静态随机存取存储器(SRAM)单元需要将扩散层弯曲成键状形状,以便与其中形成有P型阱区的衬底进行电接触,这将导致 不对称性导致了微图案化困难的问题的发生。 为了避免这个问题,构成SRAM单元的逆变器的P型阱区被细分成两部分,它们设置在N型阱区NW1的相对侧上,并形成为扩散 形成晶体管的层没有曲率,同时使得布局方向在平行于阱边界线和位线的方向上运行。 在阵列的中间位置处,以与字线平行的方式形成用于向基板供电的区域,以每组三十二个存储单元行或六十四个单元行提供一个区域。