“…There are various assist techniques reported in the literature to enable ultra-low voltage SRAM. These assist techniques include boosted WL voltage [16,[82][83][84][85][86], under driven WL voltage [16], adjustment of cell-VDD (CVDD) [87][88][89][90][91][92], dual voltage supply scheme [16,88,93,94], negative bitline (BL) [90], and write-back (WB) schemes after read [17,89,95].…”