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Spin-transfer-torque magnetoresistive random access memories using CoFeB-MgO based magnetic tunnel junctions with perpendicular easy axis (p-MTJs) are attracting much attention owing to their high potential in offering electronics with both low-power-consumption and high-performance [1–3].
We have developed a perpendicular-anisotropy magnetic tunnel junction (p-MTJ) stack with CoFeB free layer and Co/Pt multilayer based synthetic ferrimagnetic (SyF) pinned layer that withstand annealing at a temperature up to 420°C (that compatible with CMOS BEOL process) by controlling boron diffusion. We demonstrated the 10 nmφ p-MTJ with double CoFeB/MgO interface tolerable against 400°C annealing...
We developed a pin-diode silicon microring modulator that used side-wall grating waveguides. Modulator exhibits 0.28- V·cm-VπL at 25 GHz in forward-biased operation mode. We achieved 50-Gb/s operation at a driving voltage of 1.96 volts-peak-to-peak (Vpp).
We present a 50-Gb/s silicon Mach-Zehnder modulator that uses the shortest 250-µm long phase shifter. A 4.2-dB extinction ratio was obtained at 50 Gb/s with 4.35 V peak-to-peak (Vpp) driving signals and 45-mW power consumption.
We developed a high-speed Mach-Zehnder modulator with the shortest phase shifter (100-μm length) reported so far. Our modulator exhibited 25-Gbps eye-openings with an extinction ratio of 4.3 dB and on-chip insertion loss of 4.7 dB.
A silicon Mach-Zehnder modulator, which has side-wall-grating waveguide, is investigated. Using the fabricated device, 12.5-Gb/s operation was demonstrated. A modulation efficiency (VπL) of 0.29 V·cm was determined from the measured extinction ratio.
In this study, our purpose is the development of measuring and monitoring system to investigate the brain activity in usual behavior without restraint. Using this system, we can obtain physiological information such as EEG, ECG and cerebral blood of the subject always and anywhere, even if subjects walk around or move freely. In this study, we applied this system to evaluate the concentration state...
This is a report of the Embedded System Architect Developing (ESAD) program that is currently being conducted in Hamamatsu city, Shizuoka prefecture in Japan. The program has been designed for limited experienced practitioners who expect to be Embedded System Architect (ESA) in the future. In an intensive retreat environment, this program provides future ESAs with a project-based curriculum that covers...
A local feedback transconductor is known as a linear transconductor. It is necessary to employ a single-end converter circuit in order to realize linear characteristics. However, if the transconductor is applied to a gyrator active filter, two differential output terminals are needed. Then, the transfer characteristics of the active filter are not linear. In this paper, a new local feedback transconductor...
A local feedback transconductor is known as a linear transconductor. However, the linearity is deteriorated because of mobility degradation and operating in weak inversion region. In this paper, a new linear MOS transconductor based on a local feedback transconductor is proposed. The proposed circuit employs a square current source circuit and MOSFETs operating in triode region. Simulation results...
A bias-offset transconductor is known as a linear MOS transconductor. The transconductor requires some peripheral circuits, which are a floating voltage source and a biasing current source. This paper presents a design of a linear transconductor/multiplier for low-voltage and low-power operation with two techniques. One is a method to realize high-accuracy floating voltage source employing low-voltage...
A local-feedback transconductor is known as a linear transconductor. For low current operation, transistors operate in weak inversion, and the voltage-current characteristic is not expressed as square-law characteristic but expressed as an exponential function. Then, the linearity is deteriorated. In this paper, a new linear MOS transconductor based on local-feedback transconductor is presented. Resistor...
Adhesion between epoxy molding compounds (EMCs) and encapsulating mold surfaces is becoming a critical issue for integrated circuit (IC) packaging. Such adhesion results in IC damage or a serious reduction in productivity of the packaging process. It is thus highly desirable to develop mold materials that have excellent releasing properties for EMCs. In this study, the adhesion strengths of various...
Delay profile of indoor ultra-wideband impulse-radio (UWB-IR) channel should change for the movement of a human body. This paper, the use of directional antenna is suggested for UWB-IR based home security sensor and the performance is experimentally investigated.
We have successfully fabricated a large-area, flexible, ultrasonic system by integrating a two-dimensional polymeric ultrasonic sensing array with a printed organic transistor active matrix. The new sheet-type device can offer a cost-effective solution for a real-time three-dimensional imaging in free space and/or a large-area proximity sensor for robot skins.
In this paper, we propose a novel approach to assess driver's arousal states based on the analysis of eyeblink characteristics. We focus on a non-intrusive and driver-independent system. We use Hidden Markov Models (HMMs) to classify eyeblink patterns from the video of the drivers, and the arousal states are estimated from the histogram variations of these typical blink patterns. A strong correlation...
At present, the database management system occupies an important position in various application systems and in commercial systems. The study of database management system is attracting attention. We focus on open-source PostgreSQL comprising the function that it is not inferior to commercial database management system. But, there is the problem of the memory management in PostgreSQL. In a memory...
High range-resolution radar using ultra wideband radio attracts considerable attention as a short range automotive radar. Radar echo from a target often contains unwanted echoes called as clutter, which make it difficult to detect the target. In order to suppress the clutter, therefore, it is important to investigate the clutter distribution and to develop the clutter model. In this paper, traffic...
Low-power wireless communications between electronic objects scattered over tables, walls and ceiling will form an infrastructure necessary for wireless sensor networks and ambient intelligence. A data edge-signaling scheme and DC power-free pulse detector allow the realization of a low energy/bit transceiver for use in a communication sheet, which allows the creation of infrastructure for ambient...
A differential-phase-shift quantum key distribution scheme utilizing decoy pulses is proposed. Alice sends a coherent pulse train that occasionally includes high-level decoy pulses. Eavesdropping is revealed from photon counting rates around the decoy pulses.
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