发明授权
- 专利标题: Crossed strapped VSS layout for full CMOS SRAM cell
- 专利标题(中): 用于全CMOS SRAM单元的交叉带状VSS布局
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申请号: US10147222申请日: 2002-05-16
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公开(公告)号: US06569723B2公开(公告)日: 2003-05-27
- 发明人: Jhon-Jhy Liaw
- 申请人: Jhon-Jhy Liaw
- 主分类号: H01L2100
- IPC分类号: H01L2100
摘要:
This method forms an SRAM device with an array of cells having low resistance conductors for the reference potential (Vss) circuits connected to transistors in the SRAM device. First form an SRAM device with two pull-up transistors, two pull-down transistors and two pass gate transistors, including thin film gate electrode conductors and interconnection lines, each of the transistors having a drain region and a source region with source regions of the two pull-up transistors connected to a power supply voltage (Vcc). Then form a plurality of dielectric and metallization layers over the transistors, the conductors and the interconnection lines. Form a stack of layers over the transistors, the stack of layers comprising a plurality of metallization layers sandwiched between a plurality of dielectric layers. Form a conductive reference potential node electrically connected to the source region of each of the pull-down transistors. Form a first Vss strap/conductor in a first direction in a first one of the metallization layers. Form a second Vss strap/conductor in a second direction in a second one of the metallization layers. Form a VIA/contact between the conductive reference potential node and the first and second Vss strap conductors.
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