A 1-V 2-GHz RF Receiver with 49 dB of Image Rejection in CMOS/SIMOX. - Mamoru Ugajin; Junichi Kodate; Tsuneo Tsukahara (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2002)

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

A 1-V 2.4-GHz FSK receiver with a complex BPF and a frequency doubler in CMOS/SOI. - Mamoru Ugajin; Tsuneo Tsukahara (CICC, 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)

Nano-watt power management and vibration sensing on a dust-size batteryless sensor node for ambient intelligence applications. - Toshishige Shimamura; Mamoru Ugajin; Kenji Suzuki; Kazuyoshi Ono; Norio Sato; Kei Kuwabara; Hiroki Morimura; Shin'ichiro Mutoh (ISSCC, 2010)

A 5th-Order SC Complex BPF Using Series Capacitances for Low-IF Narrowband Wireless Receivers. - Kenji Suzuki; Mamoru Ugajin; Mitsuru Harada (IEICE Trans. Electron., 2011)

A 1-Mbps 1.6-µA Active-RFID CMOS LSI for the 300-MHz Frequency Band with an All-Digital RF Transmitting Scheme. - Kenji Suzuki; Mamoru Ugajin; Mitsuru Harada (IEICE Trans. Electron., 2011)

Design and Performance of a Sub-Nano-Ampere Two-Stage Power Management Circuit in 0.35-µm CMOS for Dust-Size Sensor Nodes. - Mamoru Ugajin; Toshishige Shimamura; Shin'ichiro Mutoh; Mitsuru Harada (IEICE Trans. Electron., 2011)

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)

Proposal of channel-grouping wireless-transceiver architecture for suppressing local-oscillator phase noise. - Mamoru Ugajin (IEICE Electron. Express, 2012)

Third-Harmonic Envelope Feedback Method for High-Efficiency Linear Power Amplifiers. - Shoichi Oshima; Mamoru Ugajin; Mitsuru Harada (IEICE Trans. Electron., 2012)

A 280-MHz CMOS Intra-Symbol Intermittent RF Front End for Adaptive Power Reduction of Wireless Receivers According to Received-Signal Intensity in Sensor Networks. - Mitsuo Nakamura; Mamoru Ugajin; Mitsuru Harada (IEICE Trans. Electron., 2013)

Image-rejection-performance assessment of double-conversion wireless receiver with 3-phase complex filter using Montecarlo simulation. - Mamoru Ugajin; Takuya Shindou (ISCIT, 2015)

High-image-rejection wireless-receiver architecture with a 3-phase active RC complex filter. - Mamoru Ugajin; Yuta Kobayashi; Tsuneo Tsukahara (IEICE Electron. Express, 2015)

An (N+N2)-Mixer Architecture for a High-Image-Rejection Wireless Receiver with an N-Phase Active Complex Filter. - Mamoru Ugajin; Takuya Shindo; Tsuneo Tsukahara; Takefumi Hiraguri (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017)

Novel Access Control Scheme with Collision Detection Utilizing MIMO Transmission Procedure in WLAN Systems. - Takefumi Hiraguri; Kentaro Nishimori; Yoshiaki Morino; Mamoru Ugajin; Hideaki Yoshino (IEICE Trans. Commun., 2018)

A quadrature voltage-controlled oscillator using phase-adjusting architecture for suppressing phase noise. - Mamoru Ugajin; Yuya Kakei; Nobuyuki Itoh (IEICE Electron. Express, 2021)

A Study of Phase-Adjusting Architectures for Low-Phase-Noise Quadrature Voltage-Controlled Oscillators. - Mamoru Ugajin; Yuya Kakei; Nobuyuki Itoh (IEICE Trans. Electron., 2023)