A Perpetuum Mobile 32bit CPU with 13.4pJ/cycle, 0.14µA sleep current using Reverse Body Bias Assisted 65nm SOTB CMOS technology. - Koichiro Ishibashi; Nobuyuki Sugii; Kimiyoshi Usami; Hideharu Amano; Kazutoshi Kobayashi; Cong-Kha Pham; Hideki Makiyama; Yoshiki Yamamoto; Hirofumi Shinohara; Toshiaki Iwamatsu; Yasuo Yamaguchi; Hidekazu Oda; et al. (COOL Chips, 2014)