A 0.5-V 28-nm 256-kb Mini-Array Based 6T SRAM With Vtrip-Tracking Write-Assist. - Shang-Lin Wu; Kuang-Yu Li; Po-Tsang Huang; Wei Hwang; Ming-Hsien Tu; Sheng-Chi Lung; Wei-Sheng Peng; Huan-Shun Huang; Kuen-Di Lee; Yung-Shin Kao; Ching-Te Chuang (IEEE Trans. Circuits Syst. I Regul. Pap., 2017)