Latest News

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.

Prof. Hua Wang (ETH) visited our lab at Nov. 22th, 2024! Welcome!!!

Speaker: Prof. Hua Wang (ETH, Zurich, Swiss)

Title: “Fundamentals of RF and mm-Wave Power Amplifier Designs”

Abstract: This talk presents a focused overview of mm-wave power-amplifier (PA) designs in silicon, including design fundamentals, advanced PA architectures, and state-of-the-art design examples. As phased arrays and MIMO systems have become ubiquitous in various wireless communication and sensing applications, they pose a completely new level of system complexity and different and often tighter requirements on the wireless frontend electronics, in particular the PAs. The talk will start with an introduction of PA performance metrics and their impacts on wireless systems. Next, it presents the design fundamentals of PA active devices and passive networks as well as power combining strategies. The tutorial discusses advanced PA architectures, including Doherty, Outphasing, LMBA, and Coupler-Balun Doherty PAs, for high efficiency, linearity, and bandwidth. Further, advance and challenges of high mm-Wave PAs in large-scaled arrays will be covered to address various emerging wireless applications. Finally, the talk will conclude with several state-of-the-art mm-wave PA design examples.

Prof. Matsuzawa and Prof. Okada are selected as top contributors of A-SSCC 2005-2023.

Demonstration of D-band Transceiver at EuMW!!

A great OB, working in NVIDIA, USA, visited our lab!!

Alumni Party!

If you do not receive OB/OG ML, please contact secretaryssc.pe.titech.ac.jp !

On July 25, 2024, Okada Lab welcomed Professor Patrick Mercier from the University of California, San Diego (UCSD). He visited the lab and delivered a comprehensive academic presentation to our team.

Speaker: Prof. Patrick P. Mercier, University of California, San Diego (UCSD)

Title: “Low-Power Standards-Compatible Wireless Communications Circuits for Next-Generation IoT and Wearable Applications”

Abstract:

Emerging Internet-of-Things (IoT) devices for use in smart homes, wearable systems, industrial monitoring, smart cities, and beyond all require robust yet low-power wireless communications. Unfortunately, most current wireless standards do not intrinsically support low-power operation due to strict requirements on modulation formats, data rates, linearity, packet overheads, and so on. These restrictions impose minimum power consumption requirements for cellular standards (e.g., GSM, LTE, and 5G) and WiFi, but also surprisingly limit the ability of supposedly low-power standards (e.g., Bluetooth Low Energy and Narrowband-IoT) from reaching new application-enabling power levels.

This presentation will outline the major challenges facing power reduction in modern wireless systems, and will describe several possible solutions to these challenges. Specifically, we will explore the use of wake-up receivers as a means to reduce the power overhead of between-node synchronization. Then, we will discuss an alternative communication scheme that can help to reduce the power of communication in WiFi, BLE, and body-area-network systems by >1,000x through use of standards-compatible backscatter communication systems, including the latest developments incorporating retroreflection and beam steering. We will also discuss related sensing circuit opportunities to round out the application space.

Hans HERDIAN’s thesis presentation!

Chenxin Liu, Sena Kato, Yi Zhang presented their work.

IEEE Symposium on VLSI Technology & Circuits

• Chenxin Liu “A 640-Gb/s 4x4-MIMO D-Band CMOS Transceiver Chipset”
• Sena Kato “A 28GHz 5G NR Wirelessly Powered Relay Transceiver Using Rectifier-Type 4th-Order Sub-Harmonic Mixer”
• Yi Zhang “A 28GHz 4-Stream Time-Division MIMO Phased-Array Receiver Utilizing Nyquist-Rate Fast Beam Switching for 5G and Beyond”

A new D-band CMOS transceiver chipset with 56 GHz signal-chain bandwidth achieves the highest transmission speed of 640 Gbps for a wireless device realized with integrated circuits, as reported by researchers from Tokyo Tech and National Institute of Information and Communications Technology. The proposed chipset is highly promising for the next generation of wireless systems.

Yudai YAMAZAKI won the IEICE Best Paper Award!

Ms. Anyi Tian has received the BEST SEED AWARD at SSS matching workshop!!

MCRG Technical Meeting was held.

Due to the Corona disaster, it had been 4 years and 3 months since the last face-to-face meeting was held on 2020/1/16.

5/24(Fri) 17:30-18:30
Invited talk @ S4-202 (S422)
　環境社会理工学院　笠井 康子先生
　「月に行ってテラヘルツ波で観測しよう！
　TSUKIMI: Lunar Terahertz SUrveyor for KIlometer-scale MappIng」

18:30-
ポスターセッション @ S4-203 (S423)

Zijie LIANG (Prof. Fukawa lab)
 Slotted Unsourced Random Access Using Massive MIMO
 over Frequency Selective Channels

Kui WANG (Prof. Sakaguchi lab)
 Smart Mobility Digital Twin for Automated Driving

Futo NODA (Prof. Tran lab)
 Proposal of LEO based Population Estimation System
 using Smartphone Emitted WLAN Signals

Zhou DERUN (Prof. Takada lab)
 Prediction of Shadowing Loss of 2D Object by Mirror
 Kirchhoff Approximation with Unequal Interval

Yaxiang WU (Prof. Hirokawa lab)
 Millimeter-Wave Slot Array Antennas using Gap Waveguides
 and Perpendicular Corporate-Feed Parallel Plates
 for Simplified Fabrication

Chun WANG (Prof. Okada lab)
 300GHz-band 4-Element Amplifier-Last Phased-Array Transmitter