An 80-mV-to-1.8-V Conversion-Range Low-Energy Level Shifter for Extremely Low-Voltage VLSIs. - Ryo Matsuzuka; Tetsuya Hirose; Yuzuru Shizuku; Kyohei Shinonaga; Nobutaka Kuroki; Masahiro Numa (IEEE Trans. Circuits Syst. I Regul. Pap., 2017)