A 2-V, 2-GHz low-power direct digital frequency synthesizer chip-set for wireless communication. - Akihiro Yamagishi; Masayuki Ishikawa; Tsuneo Tsukahara; Shigeru Date (IEEE J. Solid State Circuits, 1998)

2-GHz RF front-end circuits in CMOS/SIMOX operating at an extremely low voltage of 0.5 V. - Mitsuru Harada; Tsuneo Tsukahara; Junichi Kodate; Akihiro Yamagishi; Junzo Yamada (IEEE J. Solid State Circuits, 2000)

A low-power direct digital synthesizer using a self-adjusting phase-interpolation technique. - Hideyuki Nosaka; Yo Yamaguchi; Akihiro Yamagishi; Hiroyuki Fukuyama; Masahiro Muraguchi (IEEE J. Solid State Circuits, 2001)

Design methodology of low-power CMOS RF-ICs. - Tsuneo Tsukahara; Mitsuru Harada; Mamoru Ugajin; Junichi Kodate; Akihiro Yamagishi (ASP-DAC, 2003)

A Fractional Phase Interpolator Using Two-Step Integration for Frequency Multiplication and Direct Digital Synthesis. - Hideyuki Nosaka; Yo Yamaguchi; Akihiro Yamagishi; Masahiro Muraguchi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)

Design techniques for a 1-V operation Bluetooth RF transceiver. - Mamoru Ugajin; Akihiro Yamagishi; Junichi Kodate; Mitsuru Harada; Tsuneo Tsukahara (CICC, 2004)

Macromodels in the frequency domain analysis of microwave resonators. - Mamoru Ugajin; Akihiro Yamagishi; Junichi Kodate; Mitsuru Harada; Tsuneo Tsukahara (IEEE J. Solid State Circuits, 2004)

Operation of Ultra-Low Leakage Regulator Circuits with SOI and Bulk Technologies for Controlling Wireless Transceivers. - Mamoru Ugajin; Akihiro Yamagishi; Kenji Suzuki; Mitsuru Harada (IEICE Trans. Electron., 2011)

Successive interference canceller with residual interference reduction for M2M wireless access system. - Hajime Katsuda; Seiji Ohmori; Akihiro Yamagishi; Shuichi Yoshino (APCC, 2015)

Frequency offset transmitter diversity for M2M access system. - Seiji Ohmori; Akihiro Yamagishi; Hajime Katsuda; Nobuaki Mochizuki; Mitsuru Harada; Shuichi Yoshino (APCC, 2015)