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    • 4. 发明授权
    • Dual port gain cell with side and top gated read transistor
    • 双端口增益单元,具有侧和顶栅控读取晶体管
    • US07790530B2
    • 2010-09-07
    • US12254960
    • 2008-10-21
    • Jack A. MandelmanKangguo ChengRamachandra DivakaruniCarl J. RadensGeng Wang
    • Jack A. MandelmanKangguo ChengRamachandra DivakaruniCarl J. RadensGeng Wang
    • H01L21/00
    • H01L27/108H01L27/10829H01L27/10867H01L27/1203
    • A DRAM memory cell and process sequence for fabricating a dense (20 or 18 square) layout is fabricated with silicon-on-insulator (SOI) CMOS technology. Specifically, the present invention provides a dense, high-performance SRAM cell replacement that is compatible with existing SOI CMOS technologies. Various gain cell layouts are known in the art. The present invention improves on the state of the art by providing a dense layout that is fabricated with SOI CMOS. In general terms, the memory cell includes a first transistor provided with a gate, a source, and a drain respectively; a second transistor having a first gate, a second gate, a source, and a drain respectively; and a capacitor having a first terminal, wherein the first terminal of said capacitor and the second gate of said second transistor comprise a single entity.
    • 使用绝缘体上硅(SOI)CMOS技术制造用于制造致密(20或18平方)布局的DRAM存储单元和工艺顺序。 具体地,本发明提供了与现有SOI CMOS技术兼容的致密的高性能SRAM单元替换。 各种增益单元布局在本领域中是已知的。 本发明通过提供利用SOI CMOS制造的致密布局来改善现有技术的状态。 通常,存储单元包括分别设置有栅极,源极和漏极的第一晶体管; 分别具有第一栅极,第二栅极,源极和漏极的第二晶体管; 以及具有第一端子的电容器,其中所述电容器的第一端子和所述第二晶体管的第二栅极包括单个实体。
    • 9. 发明授权
    • SOI device with different crystallographic orientations
    • 具有不同晶体取向的SOI器件
    • US07439559B2
    • 2008-10-21
    • US11469039
    • 2006-08-31
    • Kangguo ChengRamachandra DivakaruniCarl J. Radens
    • Kangguo ChengRamachandra DivakaruniCarl J. Radens
    • H01L29/74
    • H01L29/78642H01L27/10864H01L27/1087
    • A method of forming a memory cell having a trench capacitor and a vertical transistor in a semiconductor substrate includes a step of providing a bonded semiconductor wafer having a lower substrate with an [010] axis parallel to a first wafer axis and an upper semiconductor layer having an [010] axis oriented at forty-five degrees with respect to the wafer axis, the two being connected by a layer of bonding insulator; etching a trench through the upper layer and lower substrate; enlarging the lower portion of the trench and converting the cross section of the upper portion of the trench from octagonal to rectangular, so that sensitivity to alignment errors between the trench lithography and the active area lithography is reduced. An alternative version employs a bonded semiconductor wafer having a lower substrate formed from a (111) crystal structure and the same upper portion. Applications include a vertical transistor that becomes insensitive to misalignment between the trench and the lithographic pattern for the active area, in particular a DRAM cell with a vertical transistor.
    • 在半导体衬底中形成具有沟槽电容器和垂直晶体管的存储单元的方法包括提供具有平行于第一晶片轴的[010]轴的下基板的接合半导体晶片的步骤,以及具有 相对于晶片轴线定向成四十五度的[010]轴,两者通过一层粘合绝缘体连接; 蚀刻通过上层和下衬底的沟槽; 扩大沟槽的下部并将沟槽的上部的横截面从八边形转换为矩形,从而降低对沟槽光刻和有源区光刻之间对准误差的敏感性。 替代方案采用具有由(111)晶体结构和相同上部形成的下基板的键合半导体晶片。 应用包括对于有源区域,特别是具有垂直晶体管的DRAM单元对沟槽和光刻图案之间的未对准变得不敏感的垂直晶体管。