The University of Tokyo · Engineering
Professor K. Shiba's research lab specializes in advanced materials development for fusion energy applications and high-performance 3D integrated electronics. The lab focuses on enhancing the toughness and irradiation resistance of reduced activation ferritic/martensitic steels, such as F82H mod3, for use in fusion reactor environments. Concurrently, the lab pioneers low-power, high-bandwidth wireless interconnect technologies using inductive coupling for 3D-stacked memory systems, enabling energy-efficient, large-capacity SRAM designs for next-generation computing accelerators. These interdisciplinary efforts bridge materials science and microelectronics to address critical challenges in energy and information technology.
Figures are computed from collected data and may differ slightly.
A toughness-improved type of F82H steel called F82H mod3 has been developed, and the material properties and irradiation behavior have been examined. The significant modification of the chemical composition is the reduction of Ti (<10 ppm) and N (<20 ppm) as impurities and the increase of Ta (0.1%) as an alloying element. The ductile-to-brittle transition temperature (DBTT) is improved to -90°C from -45°C for F82H IEA without change in strength. However, the creep rupture time of F
A 28.8-GB/s 96-MB 3D-stacked SRAM is presented. A total of eight SRAM dies, designed in a 40-nm CMOS process, are vertically stacked and connected using an inductive coupling wireless link with a low-voltage NMOS push-pull transmitter that reduces the power of the link by 35% with a 0.4-V power supply. The SRAM utilizes an inverted bit insertion scheme that compensates for the degradation of the first transmitted bit, a coil termination scheme that aims to eliminate the ringing of 3D inductive c
A 0.7-pJ/bit, 8.5-Gb/s/link inductive coupling interchip wireless communication interface for a 3D- stacked static-random access memory (SRAM) has been developed in a 7-nm FinFET process. A new physical placement method that allows coils to be placed over off-the-shelf SRAM macros with small magnetic field attenuation, together with the use of synchronous communication using Manchester encoding and a clocked comparator to enable the detection of small-swing signals, achieves a 26% reduction in S
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