发明授权
- 专利标题: Integrated circuit bipolar memory cell
- 专利标题(中): 集成电路双极存储单元
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申请号: US647315申请日: 1984-09-04
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公开(公告)号: US4622575A公开(公告)日: 1986-11-11
- 发明人: Madhukar B. Vora , William H. Herndon
- 申请人: Madhukar B. Vora , William H. Herndon
- 申请人地址: CA Cupertino
- 专利权人: Fairchild Semiconductor Corporation
- 当前专利权人: Fairchild Semiconductor Corporation
- 当前专利权人地址: CA Cupertino
- 主分类号: G11C11/411
- IPC分类号: G11C11/411 ; H01L27/06 ; H01L27/102 ; H01L29/04 ; H01L27/02 ; H01L29/70
摘要:
A static bipolar random access memory cell includes first and second transistors formed in epitaxial silicon pockets 41 and 42 in a substrate. The collectors 19 and 19' and bases 15 and 15' of the transistors are interconnected with polycrystalline silicon 21 doped to match the conductivity types of the regions contacted. Undesired PN junctions 40 and 40' created thereby are shorted using an overlying layer of a metal silicide 25. In a region overlying the N conductivity type polycrystalline silicon 23 or 23', the metal silicide is removed and a PH junction 37 or 37' created by depositing P conductivity type polycrystalline silicon 35c or 35c'. If desired additional P type polycrystalline silicon 35a and 35b may be deposited across the surface of the epitaxial layer where the base regions of the two transistors are formed to reduce the base series resistance.
公开/授权文献
- US5708875A Camera having electronic flash equipment 公开/授权日:1998-01-13
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