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A Stable SRAM Cell Design Against Simultaneously R/W Disturbed Accesses

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5 Author(s)
Suzuki, T. ; Corporate SLSI Dev. Div., Matsushita Electr. Ind. Co., Ltd., Kyoto ; Yamauchi, H. ; Yamagami, Y. ; Satomi, K.
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A guarantee obligation of keeping the cell-margin against a simultaneously read and write (R/W) disturbed accesses in the same column is required to a 2-port SRAM. We verified that it is difficult to provide these margins without any decrease in cell-current and any increase in cell-area penalty only by using the previously proposed techniques so far. To solve this, we have developed the new cell design technology for an 8-Tr 2-port cell in a 65-nm CMOS technology and have demonstrated that the R/W margins can be improved by 45%/70%, respectively at 0.9V, and the cell-size can be reduced by 20% compared with the conventional column-based Vdd control. Another 7-Tr cell which can reduce cell-area by 31% has been also demonstrated

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VLSI Circuits, 2006. Digest of Technical Papers. 2006 Symposium on

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