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Presentations in ISSCC 2026 Forum Presentation Kenichi Okada, “Exploration of 6G FR3 for Coverage, Capacity, and Sensing in Edge AI Era” Regular Session Daxu Zhang, et al., “A 9.7GHz Self-Linearized-VCO-Based FMCW Chirp Generator Achieving 1.56GHz/µs Slope and 0.57µs Duration with 0.094% rms Frequency Error” Dongfan Xu, Minghao Fan will present their work in Student Research Preview.

Seminar Speaker: Prof. Jeffrey S. Walling (Virginia Tech, USA) Title: Bits-to-Waves: Digital RF, mm-Wave and THz Systems to Enable the Next-G Abstract: Mixer-based transmitters have been dominant for approximately 100 years. However, for more than a decade RF-DACs have demonstrated the ability to combine the functionality of the DAC, upconverter and amplification stages of a transmitter into a single block. The switched-capacitor power amplifier (SCPA) is a versatile RF-DAC that operates in a voltage mode and uses transistors only as switches. This talk provides a tutorial introduction of the SCPA and presents architectural examples that enable both frequency reconfigurability and operation up to mm-Wave, supporting up to 3Gb/s transmission rates. New uses of algorithmic designs for RF passives will also be introduced. Speaker Bio: Jeff Walling received his BS from University of South Florida and his MS and PhD from University of Washington, all in Electrical Engineering. He has held industrial positions at Motorola, Intel, Qualcomm and Skyworks. His research has primarily focused on circuits for wireless communications and sensing. From 2012 to 2019, he was an assistant, then associate professor at University of Utah. Then he was head of RF transceivers at Tyndall National Institute in Cork, Ireland. Since 2021, he is an associate professor at Virginia Tech. He has served as an associate editor for TCAS-II, TCAS-I and JSSC, and on the technical program committees of the IEEE RFIC, ISSCC and NEWCAS conferences. He is a senior member of the IEEE and has more than 80 papers in peer reviewed conferences and journals.

Two students presented their work in IEEE Asian Solid-State Circuits Conference (A-SSCC), Daejeon, Korea. Dongfan Xu, Minzhe Tang, Haiyun Gu, Ziyuan Ren, Yilun Chen, Minghao Fan, Yuxuan Liu, Daxu Zhang, Yi Zhang, Zheng Li, Yuncheng Zhang, and Kenichi Okada, “A Ka-Band Time-Modulated Variable Gain Amplifier with 30-dB Gain Tuning and <2° Phase Variation via Duty Cycle Control” Sunghwan Park, Yudai Yamazaki, Carrel de Gomez, Chenxin Liu, Jun Sakamaki, Hiroyuki Sakai, Kazuaki Kunihiro, and Kenichi Okada, “A High-Efficient 154GHz 4TX/4RX FMCW Radar Chipset in 65nm CMOS” Kenichi Okada“How to cultivate good chip designers” Panel discussion “Millimeter-Wave Circuit Innovations for 6G and Beyond” KAIST EE Global Symposium IEEE/IEIE ICCE Asia“Millimeter-Wave Circuit Innovations for 6G and Beyond” also presented at Seoul National Univerisity

A picture after paper submission!

We held an OB/OG reunion on Aug. 23th, 2025 If you haven’t received emails from the OB/OG mailing list, please contact us at secretary@ssc.p.isct.ac.jp.

At the 2nd MCRG (Mobile Communication Research Group) Symposium of 2025, Mr. Yudai Yamazaki was recognized as the researcher who delivered the most outstanding poster presentation. Congratulations! **Poster Title: “**A 150GHz Compact Phased-Array Transceiver for 6G UE"

Prof. Chung-Tse Michael Wu (National Taiwan University) visited our lab!

Prof. Yu-Hsiang Cheng (National Taiwan University) visited our lab!

Prof. Mark Rodwell (UCSB) visited our university at July 15th, 2025! Welcome!!! Lecturer: Prof. Mark Rodwell（University of California, Santa Barbara） Title: 100-300 GHz Wireless: transistors, ICs, systems Date & Time: Tuesday, July 15, 2025, 15:45 – 17:30 Abstract: We describe the opportunities, and the research challenges, presented in the development of 100-300GHz wireless communications and imaging systems. In such links, short wavelengths permit massive spatial multiplexing both for network nodes and point-point links, permitting aggregate transmission capacities approaching 1Tb/s. 100-300GHz radar imaging systems can provide thousands of image pixels and sub-degree angular resolution from small apertures, supporting foul-weather driving and aviation. Challenges include the mm-wave IC designs, the physical design of the front-end modules, the complexity of the back-end digital beamformer required for spatial multiplexing, and, for imaging, the development of system architectures requiring far fewer RF channels than the number of image pixels. We will describe transistor development, IC design, and system design, and describe our efforts to develop 140GHz massive MIMO wireless hubs, and 210GHz and 280GHz MIMO backhaul links.

Mr. Yudai Yamazaki received the highest honor in the student category: the Minister of Education, Culture, Sports, Science and Technology Award.

We will hold an OB/OG gathering on Saturday, August 23, 2025! We have sent out the information via the mailing list, but if you haven’t received it, please contact us!

A novel time-division MIMO technology enables phased-array receivers to operate faster with exceptional area efficiency and low power, as reported by researchers from Institute of Science Tokyo. The proposed system significantly reduces circuit complexity for 5G and 6G networks, including non-terrestrial nodes, by reusing signal paths through fast switching. It demonstrated a record-setting 38.4 Gbps data rate across eight streams in a 65 nm CMOS integrated circuit.

An ultra-compact, low-power 150 GHz radio module enabling high data rates in mobile devices has been developed by researchers from Japan. Targeting 6G user equipment, the proposed design integrates a phased-array transceiver with several key innovations to overcome the main challenges of operating at frequencies in the 150 GHz band. This work could thus pave the way to unprecedented connectivity in terminal devices, way surpassing existing 5G technology.

VLSI Symposium demonstration

Congratulations! Dr. Chun Wang won Seiichi Tejima Research Award.

Eveninig Panel: “Future of Analog Design: Still Magical or Mostly Digital?” Forum: Wireless Communication Technology for Space Applications: From Satellite to Dish and Smartphones Kenichi Okada, Institute of Science Tokyo, Tokyo, Japan “Foldable Phased-Array Transceivers for Satellite Communications”

Congratulations! Dr. Xu Dingxin won IEEE SSCS Predoctoral Achievement Award

Three innovative design techniques substantially enhance wireless transmitter performance and can boost power efficiency and elevate data rates concurrently, as reported by the researchers from Science Tokyo, Japan. This effectively aligns with the growing demand for speed and efficiency, accelerating the widespread deployment of wireless devices. This enables synergistic operation of wireless electronic devices and better quality of modern life.

Presentations in ISSCC 2025 Forum Presentation Kenichi Okada, “Foldable Phased-Array Transceivers for Satellite Communications” Regular Session Yuncheng Zhang, et al.,“A Power-Efficient CORDIC-less Digital Polar Transmitter Using 1b DSM-Based PA Supporting 256-QAM” Sena Kato, et al.,“A 256-Element Ka-Band CMOS Phased-Array Receiver Using Switch-Type Quadrature-Hybrid-First Architecture for Small Satellite Constellations” (Shirane Lab) Yudai Yamazaki, Minzhe Tang, Daxu Zhang will present their work in Student Research Preview.