Faculty Information - Yamaji Takafumi | SOJO UNIVERSITY

（Last updated : 2026-05-14 13:08:50）

Visruth.jpg not found

Yamaji Takafumi

Department / Course FACULTY OF COMPUTER AND INFORMATIONSCIENCES Department of Computer and Information Sciences

Job

Book and thesis
1.	2026/09	Papers	A Study on the Existence of Undesired Steady States in the Feedback Phase Control system (Sole-authored)
2.	2025/04/29	Other	Antenna Beamforming With Feedback Phase Control and a Study on the Control Stability Electronics and Communications in Japan 108 (2) (Co-authored)
3.	2025/02/01	Papers	Antenna Beamforming with Feedback Phase Control and a Study on the Control Stability,pp.214-222 (Co-authored)
4.	2020/09	Papers	A study of Noise and Occupied Area of Poly-Phase Circuit The IEICE Transaction on Fundamentals of Electronics, Communications and Computer Sciences,pp.201-209 (Co-authored)
5.	2013/05	Papers	All-Digital Background Calibration Technique for Time-Interleaved ADC Using Pseudo Aliasing Signal IEEE Transaction On Circuits and Systems I: Regular Papers 60 (5),pp.1113-1121 (Co-authored)
Display All（24）

Academic conference presentation
1.	2019/08/22	A Study on Noise and Occupied Area of Poly-phase Circuits (The 32nd Workshop on Circuits and Systems)
2.	2018/03/13	A proposal of an analog poly-phase integrator with complex coefficient
3.	2012/06	A -70dBm-sensitivity 522Mbps 0.19nJ/bit-TX 0.43nJ/bit-RX transceiver for TransferJet^TM SoC in 65nm CMOS (Symposium on VLSI Circuits)
4.	2012/05	All-digital background calibration for time-interleaved ADC (IEEE International Symposium on Circuits and Systems (ISCAS))
5.	2011/02	A 570 fsrms integrated-jitter ring-VCO-based 1.21GHz PLL with hybrid loop (IEEE International Solid-State Circuits Conference (ISSCC))
Display All（21）

Academic background
1.	2004/03/25 Degree Acquisition	Graduate School, Division of Information Systems Kyushu University Doctor of engineering (Electron device/Electronic equipment)
2.	1988/04～1990/03	Master Graduate School, Division of Engineering Kyushu University Finished
3.	1984/04～1988/03	Faculty of Engineering Kyushu University Graduated

Business career
1.	2016/04/01 ～	SOJO UNIVERSITY FACULTY OF COMPUTER AND INFORMATIONSCIENCES Department of Computer and Information Sciences
2.	1990/04 ～ 2016/03	Toshiba Corp.
3.	2017/04/01 ～	Graduate School of Engineering /(DC)Division of Applied Information Sciences
4.	2017/04/01 ～	Graduate School of Engineering /Division of Applied Information Sciences

Present specialized field
Electron device and electronic equipment, Communication and network engineering, Control and system engineering

Acquisition patent
1.	2016/03/08	Radio apparatus （USP 9,281,830）
2.	2015/08/04	Fractional frequency dividing circuit and transmitter （USP 9,099,959）
3.	2015/03/31	Semiconductor device and receiver （USP 8,994,436）
4.	2015/02/15	Radio apparatus （USP 8,958,767）
5.	2014/02/25	Time error estimating device, error correction device and A/D converter （USP 8,659,454）
Display All（39）