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A Differential Data-Aware Power-Supplied (D ^{2} AP) 8T SRAM Cell With Expanded Write/Read Stabilities for Lower VDDmin Applications

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8 Author(s)
Meng-Fan Chang ; Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan ; Jui-Jen Wu ; Kuang-Ting Chen ; Yung-Chi Chen
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Due to global and local process variations, on-chip SRAM suffers failures at a low supply voltage (VDD). This study proposes a differential data-aware power-supplied D2 AP 8T SRAM cell to address the stability and trade-off-issues between write and half-select accesses that still remain in the conventional 8T and 6T cells. Powered by its bitline pair, the proposed 8T cell applies differential data-aware-supplied voltages to its cross-coupled inverters to increase both stability margins for write and half-select accesses. A boosted bitline scheme also improves the read cell current. Two 39 Kb SRAM macros, D2 AP-8T and conventional 8T, with the same peripheral circuits were fabricated on the same testchip with 45 nm and 40 nm processes. The measured VDDmin for the D2 AP-8T macro is 240 mV-200 mV lower than that of the conventional 8T macro across lots, wafers and dies.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:45 ,  Issue: 6 )