A low-noise direct conversion PSK receiver for TDMA land mobile communications. - Ryoji Hayashi; Takao Nakajima; Mitsuhiro Shimozawa; Makoto Miyake; Tadashi Fujino (PIMRC, 1997)

A delta-sigma baseband phase detector realizing AGC-free PSK and FSK receivers. - Ryoji Hayashi; Fumio Ishizu; Keishi Murakami (PIMRC, 2002)

Low power demodulators with phase quantization for a zero-IF Bluetooth receiver. - Sohrab Samadian; Ryoji Hayashi; Asad A. Abidi (ISCAS (1), 2003)

Demodulators for a zero-IF Bluetooth receiver. - Sohrab Samadian; Ryoji Hayashi; Asad A. Abidi (IEEE J. Solid State Circuits, 2003)

Novel Phase-Continuous Frequency Hopping Control for a Direct Frequency Synthesizer Using a Quadrature Mixer Driven by Two Ddss. - Kenichi Tajima; Ryoji Hayashi; Kenji Itoh; Yoji Isota (IEICE Trans. Electron., 2006)

Efficiency Enhancement of a Digital Predistortion Doherty Amplifier Transmitter Using a Virtual Open Stub Technique. - Kenichi Horiguchi; Satoru Ishizaka; Masatoshi Nakayama; Ryoji Hayashi; Yoji Isota; Tadashi Takagi (IEICE Trans. Electron., 2007)

A Wideband Digital Predistorter for a Doherty Power Amplifier Using a Direct Learning Memory Effect Filter. - Kenichi Horiguchi; Naoko Matsunaga; Kazuhisa Yamauchi; Ryoji Hayashi; Moriyasu Miyazaki; Toshio Nojima (IEICE Trans. Electron., 2010)

A Novel Spur Suppression Technique Using Three-Phase Holding Pulse for High-Frequency-Output Direct Digital Synthesizer. - Kenichi Tajima; Ryoji Hayashi (IEICE Trans. Electron., 2010)

Parallel Dual Modulus Prescaler with a Step Size of 0.5. - Hideyuki Nakamizo; Kenichi Tajima; Ryoji Hayashi; Kenji Kawakami; Toshiya Uozumi (IEICE Trans. Electron., 2012)