Tetsu Tanaka

Bio: Tetsu Tanaka is an academic researcher from Tohoku University. The author has contributed to research in topics: Wafer & Chip. The author has an hindex of 38, co-authored 406 publications receiving 10375 citations. Previous affiliations of Tetsu Tanaka include NTT DoCoMo & Tokyo Medical and Dental University.

Chip-based hetero-integration technology for high-performance 3D stacked image sensor

Abstract: We have developed a 3D-stacked image sensor chip composed of CMOS image sensor (CIS) layer, correlated double sampling circuit (CDS) layer, and analog-to-digital converter (ADC) array layer using the chip-based 3D heterogeneous integration technology Three kinds of chips, CIS chip, CDS chip, and ADC chip, which were fabricated by different technologies, are processed and stacked vertically to form a prototype 3D-stacked image sensor Through-Si vias (TSVs) and metal micro-bumps are formed in chip-level before stacking The fundamental characteristics are evaluated in the fabricated prototype 3D-stacked image sensor

Novel Hybrid Bonding Technology Using Ultra-High Density Cu Nano-Pillar for Exascale 2.5D/3D Integration

Abstract: We propose a novel hybrid bonding technology with a high stacking yield using ultra-high density Cu nano-pillar (CNP) for exascale 2.5D/3D integration. To solve the critical issues of a current standard hybrid bonding technology, we developed scaled electrodes with slightly extruded structure and unique adhesive layer of anisotropic conductive film composed of ultra-high density CNP. Test element group (TEG) dies with 7-mm $\times 23$ -mm size are bonded to interposer wafer by a new hybrid bonding technology. Scaled electrodes with 3- $\mu \text{m}$ diameter and 6- $\mu \text{m}$ pitch are formed in each TEG chip. We confirmed for the first time that a huge number of electrodes of 4 309 200 are successfully connected in series with the joining yield of 100% due to the ultra-high density CNP.

Analytical Surface Potential Expression For Double-gate SOI MOSFETs

Abstract: Double-Gate SO1 MOSFETs have been invoked to alleviate scaling limits of bulk MOSFETs. Since the potential distribution in these devices is quite unlike that in bulk MQSFETs. due to the symmetrical structure (Fig.' 1) and extremely low doping concentration NA [l]. the models developed for bulk MOSFETs are not applicable. Using a perturbation theory, we solved the Poisson equation considering both depleted and induced charges, and derived an analytical expressions for surface potential, I$s, for the entire subthreshold, moderateand strong-inversion regions. We then derived analytical models for the threshold voltage. V&. conducting charge concentration. 81, and subthreshold swing, S-factor pable 1) which agree well with numerical and experimental data.

Micro-Raman spectroscopy analysis and capacitance - time (C-t) measurement of thinned silicon substrates for 3D integration

Abstract: Mechanical stress, crystal defects, and metal contamination in thinned silicon substrates with and without intrinsic gettering (IG) zone have been investigated for three-dimensional (3D) integration The remnant stress existing after wafer thinning was evaluated using angle-(5°) polished silicon wafers by micro-Raman spectroscopy (μRS) The metal contamination in the thinned silicon substrates has been evaluated by a capacitance - time (C-t) measurement method using MOS capacitors in which the thinned silicon substrates were diffused with metallic impurities such as Cu and Au used for through-silicon via (TSV) and metal micro-bump in 3D LSI

New Reconfigurable Memory Architecture for Parallel Image-Processing LSI with Three-Dimensional Structure

Abstract: A reconfigurable memory network for a parallel image-processing LSI with a three-dimensional structure is proposed. The proposed memory network can be dynamically configured by changing the connections between processing elements (PEs) and memories in accordance with the required part of the stored image data. In addition, a specification of the data bandwidth between PEs and the proposed memory network can be changed in the synchronization with single instruction stream-multiple data stream (SIMD) and multiple instruction stream-multiple data stream (MIMD) operations. Therefore, data transfer has greater flexibility. Also, from the result of the performance evaluation by implementation into the field programmable gate array (FPGA), it was successfully shown that the proposed memory network reduced the execution time by up to 28.2% for a 9×9 filtering operation.

Deciphering the biology of Mycobacterium tuberculosis from the complete genome sequence

Abstract: Countless millions of people have died from tuberculosis, a chronic infectious disease caused by the tubercle bacillus. The complete genome sequence of the best-characterized strain of Mycobacterium tuberculosis, H37Rv, has been determined and analysed in order to improve our understanding of the biology of this slow-growing pathogen and to help the conception of new prophylactic and therapeutic interventions. The genome comprises 4,411,529 base pairs, contains around 4,000 genes, and has a very high guanine + cytosine content that is reflected in the biased amino-acid content of the proteins. M. tuberculosis differs radically from other bacteria in that a very large portion of its coding capacity is devoted to the production of enzymes involved in lipogenesis and lipolysis, and to two new families of glycine-rich proteins with a repetitive structure that may represent a source of antigenic variation.

Antiinflammatory Therapy with Canakinumab for Atherosclerotic Disease

Abstract: BackgroundExperimental and clinical data suggest that reducing inflammation without affecting lipid levels may reduce the risk of cardiovascular disease. Yet, the inflammatory hypothesis of atherothrombosis has remained unproved. MethodsWe conducted a randomized, double-blind trial of canakinumab, a therapeutic monoclonal antibody targeting interleukin-1β, involving 10,061 patients with previous myocardial infarction and a high-sensitivity C-reactive protein level of 2 mg or more per liter. The trial compared three doses of canakinumab (50 mg, 150 mg, and 300 mg, administered subcutaneously every 3 months) with placebo. The primary efficacy end point was nonfatal myocardial infarction, nonfatal stroke, or cardiovascular death. ResultsAt 48 months, the median reduction from baseline in the high-sensitivity C-reactive protein level was 26 percentage points greater in the group that received the 50-mg dose of canakinumab, 37 percentage points greater in the 150-mg group, and 41 percentage points greater in t...

Complete genome sequence of Pseudomonas aeruginosa PAO1, an opportunistic pathogen.

Abstract: Pseudomonas aeruginosa is a ubiquitous environmental bacterium that is one of the top three causes of opportunistic human infections. A major factor in its prominence as a pathogen is its intrinsic resistance to antibiotics and disinfectants. Here we report the complete sequence of P. aeruginosa strain PAO1. At 6.3 million base pairs, this is the largest bacterial genome sequenced, and the sequence provides insights into the basis of the versatility and intrinsic drug resistance of P. aeruginosa. Consistent with its larger genome size and environmental adaptability, P. aeruginosa contains the highest proportion of regulatory genes observed for a bacterial genome and a large number of genes involved in the catabolism, transport and efflux of organic compounds as well as four potential chemotaxis systems. We propose that the size and complexity of the P. aeruginosa genome reflect an evolutionary adaptation permitting it to thrive in diverse environments and resist the effects of a variety of antimicrobial substances.