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In the development of high density DRAMs such as 1 M bit or beyond, it will be increasingly important to achieve high speed, competitive to SRAMs, in addition to low cost per bit. Recently, BIPOLAR CMOS (BICMOS) technology has been proposed for achieving high speed and low power operation, especially SRAMs (1,2).
Time-domain analysis of electromagnetic fields is indispensable for developing target identification, designing microwave devices, studying optical properties of materials, and so on. Many commercial softwares based on time-domain solvers are available and they are useful for practical applications of industrial design and modeling. However, it is still difficult to evaluate accuracy and reliability,...
This paper presents a novel side gate HiGT (High-conductivity IGBT) that incorporates historical changes of gate structures for planar and trench gate IGBTs. Side gate HiGT has a side-wall gate, and the opposite side of channel region for side-wall gate is covered by a thick oxide layer to reduce Miller capacitance (Cres). In addition, side gate HiGT has no floating p-layer, which causes the excess...
This paper reports mass sensitivity amplification in a Gaussian-shaped quartz crystal resonator (Gaussian-shaped QCR). To achieve amplification, a fabrication process for a Gaussian-shaped (not quasi-Gaussian) QCR was developed using photolithographic methods. Sensitivity amplification in the QCR was observed at the central portion. The mass response was three times higher than the theoretical value...
In this paper, a novel simple power switching method for dc switching devices is proposed to apply to HVDC system of more than 380 V DC. The method extends and extinguishes an arc between electrical contacts when opening power circuit. In addition, the power circuit can be disconnected even if the current direction reverses. The method is composed simply by using a unique combination of a small magnet,...
Silicon-photonic hybrid ring-filter external cavity (SHREC) tunable lasers fabricated by passive alignment techniques are demonstrated. High power, narrow linewidth and highly reliable characteristics are achieved thanks to drastically reduced losses in the laser cavity toward commercialization.
We propose a pixel construction for a pH image sensor with a new measurement method that spills charge to a potential wall under sensing area. The sensor pixel with 3 transistors has advantages for fabricating the sensor array with high spatial resolution compared with a conventional ISFET type sensor array using 4 transistors. The pixel size of the fabrication using the 3 transistor structure is...
Recently, computer simulation scale for biomedical EMC becomes extremely huge, because numerical models, which represent shape, structure, configuration, etc., of biological bodies, increase these preciseness. Parallelizing simulation code is one of the effective solutions to deal with such a high definition and massive scale problem. Finite difference methods, frequently used for solving biomedical...
RF exposure guidelines[1–3] recognize that an increase in local SAR due to metallic implants is possible, depending upon the size and shape of the implant and the position. Some papers regarding interaction of radio frequency (RF) EMF and passive metallic implants have been published [4–5]. This study describes the local SAR calculations for human with metallic osteosynthesis plates embedded in the...
Dielectric property measurement of liquid in the frequency range above microwave region is required to investigate the interaction between electromagnetic waves and human body because most biological materials are liquids. Various measurement systems are compared by measuring water approximately from 1 GHz to 3 THz. All data are in good agreement.
Characteristics of fast recovery diode (FRED) type super junction MOSFET (SJ-MOS) are reported. The reverse recovery ruggedness (-di/dt ruggedness) of the SJ-MOS FRED is dramatically improved compared to that of non-FRED type, which is almost 16 times better.
In recent years, electromagnetic interference (EMI) on implanted cardiac pacemakers due to mobile phones has become a large concern. Here, in the previous studies, dipole antenna or monopole antenna loaded to a metallic case which simulates the PCB, battery etc. were mainly employed as a mobile phone model. However, recent mobile phones are generally equipped with an embedded antenna such as planar...
We have developed a sub-two-cycle intense infrared light source using novel BiB3O6 (BIBO)-based optical parametric amplifiers for the generation of high harmonics in soft X rays. The cutoff of high harmonics has extended to ∼320 eV, which is well beyond the carbon K edge. The spectral structures and their dependences on the carrier-envelope phase strongly suggest the generation of single isolated...
Most of strong-field experiments such as high harmonic generation (HHG), attosecond pulse generation, and their applications rely on femtosecond Ti:sapphire lasers around 800 nm. Currently the photon energy range in HHG is limited to 200 eV or less for spectroscopic applications. To overcome this barrier, an IR source is promising because the ponderomotive potential is proportional to the square of...
In the current cloud era, new cloud skills are required for IT specialists. Educational organizations such as universities need to provide an educational cloud for their students. We have constructed a private educational cloud based on the Ubuntu Enterprise Cloud. The most important feature of our cloud is super saturation, which is defined as allocating more logical resources than actual physical...
We present distributed Nyquist wavelength-division multiplexing experiments with four 25-GBd quadrature phase-shift keying modulation channels having 4% guard-band. Optical fiber-frequency conversion ensures accurate remote optical frequency alignment of the channels.
We propose an efficient data aggregation through optical frequency conversion of discrete multi-tone (DMT) signals. We demonstrate distributed multiplexing of four DMT signals with BPSK to 128QAM, and achieve total 29.2-Gb/s data-multiplexing within 6-GHz bandwidth.
We demonstrate the chip-based 3D heterogeneous integration technology for realizing highly parallel 3D-stacked image sensor. Three kinds of chips, CMOS image sensor chip, analog circuit chip, and ADC array 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...
This paper describes two whole-body exposure systems for biological effect tests of radio frequency (RF) electromagnetic fields. The first exposure system is designed at 2 GHz band to have a feature of circular polarization for simulating a variety of coupling with humans in daily environment. The second exposure system is designed to simulate a multiple-frequency exposure between 800 MHz and 5.5...
In vivo ocular temperatures in rabbits were measured during 40 GHz millimeter-wave exposure (400–100 mW/cm2). To visualize aqueous humor convection, 0.2% microencapsulated thermochromic liquid crystals (MTLCs) were injected into the anterior chambers of rabbit eyes. Exposure to 40 GHz increased corneal, lens and retrobulbar temperature, with aqueous humor convection having an important role in heat...
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