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Kenji OHNO,Hiroki MATSUMOTO,Kenji MURAO 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
As the chip integration advances toward the CMOS VLSI integrated systems, on-chip Digital-to-Analog Converter (DAC) becomes more important building blocks. Key technologies in DAC is fabrication at low-cost and operation on high-performance. Highresolution and Low-Voltage DAC is required in many fields. Their advantage extends to mixed-signal systems where both frequency higher, the device shrinks into deep sub-micrometer. However the shrinking device dimensions also imply proportional scalling of power supply voltage. Advantages of alogorithmic DAC using Switched-Capacitor (SC) are suitable to the above requirement. SC operates on small chip area, low consumption of electoric power, and is compatible to MOS IC. To operate under low supply voltage, terminal of NMOS analog switch should connect to ground or virtual ground.[1] However, major performance of conventional algolithmic DAC is limited by offset voltage and spike.[2] In this paper, they shows two Low-Voltage SC cyclic DACs. They are proposed which consists of a switch, capacitor, MOSFET and operational amplifier (op-amp). Circuit operation is evaluated on SIMetrix.
Spike-compensated Low-Voltage Unity-Gain-Reset Switched-Capacitor Cyclic Digital-to-Analog Converter
Kenji OHNO,HirokiMATSUMOTO,Kenji MURAO 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
As the chip integration advances toward the CMOS VLSI integrated systems, on-chip Digital-to-Analog Converter (DAC) becomes more important building blocks. Key technologies in DAC is fabrication at low-cost and operation on high-performance. Highresolution and Low-Voltage DAC is required in many fields. Their advantage extends to mixed-signal systems where both frequency higher, the device shrinks into deep sub-micrometer. However the shrinking device dimensions also imply proportional scalling of power supply voltage. Advantages of Alogorithmic DAC using Switched-Capacitor (SC) are suitable to the above requirement. SC are small chip area, low consumption of electoric power, and compatibility to MOS IC. To operate under low supply voltage, terminal of NMOS analog switch should connect to ground or virtual ground. However, major performance of conventional algolithmic DAC is limited by offset voltage and spike. In this paper, it shows a Low-Voltage SC cyclic DAC. It is proposed which consists of a switch, capacitor, MOSFET and op-amp. Circuit operation is evaluated on SIMetrix.
Hashimotodani, Yuki,Ohno-Shosaku, Takako,Tsubokawa, Hiroshi,Ogata, Hidenori,Emoto, Ken,Maejima, Takashi,Araishi, Kenji,Shin, Hee-Sup,Kano, Masanobu Elsevier 2005 Neuron Vol.45 No.2
<P><B>Abstract</B></P><P>Endocannabinoids mediate retrograde signal and modulate transmission efficacy at various central synapses. Although endocannabinoid release is induced by either depolarization or activation of G<SUB>q/11</SUB>-coupled receptors, it is markedly enhanced by the coincidence of depolarization and receptor activation. Here we report that this coincidence is detected by phospholipase Cβ1 (PLCβ1) in hippocampal neurons. By measuring cannabinoid-sensitive synaptic currents, we found that the receptor-driven endocannabinoid release was dependent on physiological levels of intracellular Ca<SUP>2+</SUP> concentration ([Ca<SUP>2+</SUP>]<SUB>i</SUB>), and markedly enhanced by depolarization-induced [Ca<SUP>2+</SUP>]<SUB>i</SUB> elevation. Furthermore, we measured PLC activity in intact neurons by using exogenous TRPC6 channel as a biosensor for the PLC product diacylglycerol and found that the receptor-driven PLC activation exhibited similar [Ca<SUP>2+</SUP>]<SUB>i</SUB> dependence to that of endocannabinoid release. Neither endocannabinoid release nor PLC activation was induced by receptor activation in PLCβ1 knockout mice. We therefore conclude that PLCβ1 serves as a coincidence detector through its Ca<SUP>2+</SUP> dependency for endocannabinoid release in hippocampal neurons.</P>
CLOUD PROFILING RADAR ON EARTHCARE SATELLITE
Nobuhiro Takahashi,Toshiyoshi Kimura,Yuichi Ohno,Hiroaki Horie,Hirotaka Nakatsuka,Kenji Sato,Yasuo Sakaide,Kazuyuki Okada,Hiroshi Kumagai 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The design and current status of EarthCARE/CPR are described in this report. Basic design of CPR will be confirmed in this year, and engineering model development and testing will be done this year and the next year. In parallel with the development activity of CPR, algorithm development activity is in progress. The data from CPR is expected to contribute to reveal the detailed information of clouds and to the studies on global warming. It is also expected the continuation of cloud observation from CloudSat data that was launched in 2006[4].
Investigation of the Magnetic Co Antidot Array Structure on Anodic Porous Alumina
박영옥,김철성,고태준,Satoru Mohri,Sawako Ohno,Kenji Taira,Yasushi Hirose,Tetsuya Hasegawa 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.2
The surface morphology and the magnetic properties of thin Co films deposited on anodic porous alumina substrates have been studied. The uniform porosity of the alumina substrate prepared by using the two-step anodization process allows the fabrication of Co films with an antidot nanostructure. Also, by varying the deposition temperature, we obtain two distinctive surface morphologies through the thermally-driven coalescence process. Careful measurements of their magnetization curves reveal that the magnetic properties, such as the coercivity and the shape of the hysteresis curve, of the Co films deposited on the porous substrates differ significantly from those of films deposited on non-porous substrates.