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    • 44. 发明授权
    • MOS device for long-term learning
    • MOS器件长期学习
    • US4953928A
    • 1990-09-04
    • US363678
    • 1989-06-09
    • Janeen D. W. AndersonCarver A. Mead
    • Janeen D. W. AndersonCarver A. Mead
    • H01L29/788H01L29/861
    • H01L29/7885H01L29/7887H01L29/8616
    • A semiconductor structure for long-term learning includes a p-type silicon substrate or well having first and second spaced apart n-type regions formed therein. A polysilicon floating gate is separated from the surface of the silicon substrate by a layer of gate oxide. One edge of the polysilicon floating gate is aligned with the edge of the first n-type region such that the polysilicon floating gate does not appreciably overly the n-type region. The second n-type region lies beyond the edge of the polysilicon floating gate. The first n-type region, the silicon substrate, and the second n-type region form the collector, base, and emitter, respectively, of a lateral bipolar transistor.An alternate embodiment of a semiconductor long-term learning structure includes an n-type silicon substrate having a p-well region formed therein. An n-type region is formed within the well region. A polysilicon floating gate is separated from the surface of the silicon substrate by a gate oxide and is positioned above the well region. One edge of the polysilicon floating gate is aligned with the edge of the n-type region within the well region such that the polysilicon floating gate does not appreciably overly the n-type region. The substrate, the well, and the n-type region, respectively, form the emitter, base, and collector of a bipolar transistor.
    • 用于长期学习的半导体结构包括在其中形成有第一和第二间隔开的n型区的p型硅衬底或阱。 多晶硅浮栅通过一层栅极氧化物与硅衬底的表面分离。 多晶硅浮动栅极的一个边缘与第一n型区域的边缘对准,使得多晶硅浮置栅极不明显地超过n型区域。 第二n型区域位于多晶硅浮栅的边缘之上。 第一n型区域,硅衬底和第二n型区域分别形成横向双极晶体管的集电极,基极和发射极。 半导体长期学习结构的替代实施例包括其中形成有p阱区的n型硅衬底。 在阱区内形成n型区域。 多晶硅浮置栅极通过栅极氧化物与硅衬底的表面分离并且位于阱区域之上。 多晶硅浮置栅极的一个边缘与阱区域内的n型区域的边缘对齐,使得多晶硅浮栅不明显地超过n型区域。 衬底,阱和n型区域分别形成双极晶体管的发射极,基极和集电极。