Increasing minimum operating voltage (VDDmin) with number of CMOS logic gates and experimental verification with up to 1Mega-stage ring oscillators. - Taro Niiyama; Piao Zhe; Koichi Ishida; Masami Murakata; Makoto Takamiya; Takayasu Sakurai (ISLPED, 2008)

Dependence of Minimum Operating Voltage (VDDmin) on Block Size of 90-nm CMOS Ring Oscillators and its Implications in Low Power DFM. - Taro Niiyama; Piao Zhe; Koichi Ishida; Masami Murakata; Makoto Takamiya; Takayasu Sakurai (ISQED, 2008)

Difficulty of Power Supply Voltage Scaling in Large Scale Subthreshold Logic Circuits. - Tadashi Yasufuku; Taro Niiyama; Piao Zhe; Koichi Ishida; Masami Murakata; Makoto Takamiya; Takayasu Sakurai (IEICE Trans. Electron., 2010)

Power Supply Voltage Dependence of Within-Die Delay Variation of Regular Manual Layout and Irregular Place-and-Route Layout. - Tadashi Yasufuku; Yasumi Nakamura; Piao Zhe; Makoto Takamiya; Takayasu Sakurai (IEICE Trans. Electron., 2011)