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Novel gas sensor based on nano-zeolite films for the nerve agent simulant Dimethylmethylphosphonate detection

Novel gas sensor based on nano-zeolite films for the nerve a...

引用

2004 7th International Conference on Solid-state and Integrated Circuits Technology Proceedings, ICSICT 2004

作者： Xie, Haifen Sun, Xiao Xiang Yang, Qiudong Wang, Jianye Huang, Yiping ASIC System State Key Lab. Department of Microelectronics 220 Handan Road Shanghai 200433 China Physics Department East China University of Science and Technolegy Jinshan Campuse 1000 Xuefu Road Shanghai 201512 China

A novel gas sensor based on nanosized zeolite for the detection of nerve agent simulant gas Dimethylmethylphosphonate (DMMP) is developed in this work. Nanosized ZSM-5 zeolite films and Ag+ modified ZSM-5 zeolites films as a novel sensing membrane materials are immobilized on the piezoelectric sensor device QCM (Quartz Crystal Microbalance). A frequency shift with different concentrations of DMMP is measured. The gas sensor based on nanosized zeolite in resonating mode, whose resonant frequency shifts due to mass loading, has shown high sensitivity for detecting DMMP. The minimum detection concentration of DMMP is 1ppm in the N2 at 303K. The frequency shift is about 60Hz for Ippm DMMP. In order to improve the selectivity of the sensor to the DMMP from other organic gases, different pore size zeolite films such as ZSM-5 zeolites and Ag+ modified ZSM-5 zeolites are studied. The frequency shifts to another two organic gases such as acetone and ethanol at Ippm concentration are observed for the sensor selectivity detection. The relationship between frequency shift and temperature for 1ppm DMMP has been studied. The best adsorption temperature is 303K and the desorption temperature is at the DMMP boiling point, 473K. Using principle component analysis (PCA);we can easily qualify and quantify the DMMP gas. © 2004 IEEE.

关键词： Chemical sensors

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A novel edge contact type cell for phase change RAM using N-doped GeSbTe films

A novel edge contact type cell for phase change RAM using N-...

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2004 7th International Conference on Solid-state and Integrated Circuits Technology Proceedings, ICSICT 2004

作者： Ling, Yun Lin, Yinyin Lai, Lianzhang Iao, Baowei Lai, Yunfeng Feng, Jie Tang, Ting Ao Cai, Bingchu Chen, Bomy Department of Microelectronics State Key Lab ASIC and System Fudan University Shanghai 200433 China Research Institute of Micro/Nanometer Technology Shanghai Jiao Tong University Shanghai 200030 China Silicon Storage Technology Inc. 1171 Sonora Court Sunnyvale CA 94086 United States

A novel 2D nanometer Edge Contact Type Cell for Phase Change RAM is manufactured, in which the active area can be controlled mainly by the thickness of both bottom electrode film and the GST film. The high resistive GST is indispensable to minimize the writing current and threshold voltage of PCRAM[1]. The GST resistivity can be increased effectively by doping nitrogen and the nitrogen-doped film is first used in the novel 2D nanometer structure successfully for reducing the threshold voltage application. It is found the phase change from FCC to hexagonal structure is suppressed by nitrogen doping, while 3 stable resistance states is first found in the resistivity-annealling temperature curve for the film by sputtering method, which might be used in multilevel PCRAM. © 2004 IEEE.

关键词： Random access storage

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Optimal ramped-gate soft programming of over-erased flash EEPROM cells at given current

Optimal ramped-gate soft programming of over-erased flash EE...

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2004 7th International Conference on Solid-state and Integrated Circuits Technology Proceedings, ICSICT 2004

作者： Quan, Wu-Yun Baek, Chang-Ki Kim, Dae M. Gang, Ruan Huang, Yiping ASIC and System State-Key Research Lab. Department of Microelectronics Fudan University 220 Handan-road 200433 Shanghai China School of Electrical Engineering and Computer Science ISRC Seoul National University Kwanak P.O. Box 34 Seoul 151-744 Korea Republic of Korea Institute for Advanced Study 207-43 Cheongryangri Seoul Korea Republic of

Presented herein is an efficient simulation technique enabling systematic investigation of the soft programming over-erased flash EEPROM cells. The simulation provides a method by which to find the optimal soft programming technique for given current. The method requires only the cell performance data and allows investigation of the soft programming under various bias conditions. In principle, the methodology can also be used to investigate the programming and erase operations. © 2004 IEEE.

关键词： Flash memory

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A CMOS PLL using current-adjustable charge-pump arid on-chip loop filter with initialization circuit 5

A CMOS PLL using current-adjustable charge-pump arid on-chip...

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5th International Conference on asic, asicON 2003

作者： Hui, Zhao Junyan, Ren Qianling, Zhang ASIC and System State Key Lab. Fudan University 200433 China

ISBN: (纸本)078037889X

A 900MHz CMOS PLL using current-adjustable charge-pump circuit and on-chip loop filter with initialization circuit is presented. The charge-pump current is insensitive to the changes of temperature and power supply. The value of the charge-pump current can be changed by switches which are controlled by external signals. Thus the performance of the PLL, such as loop bandwidth, can be changed with the change of the charge-pump current. The loop filter initialization circuit can speed up the PLL when power on, A multi-modulus prescaler is used to fulfill the frequency division in the feedback loop. The circuit is designed in 0.18µm 1.8v 1P6M standard digital CMOS process. © 2003 IEEE

关键词： Phase locked loops

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The architecture of the Java Extension of 32-bit RISC for smart cards and other embedded systems

The architecture of the Java Extension of 32-bit RISC for sm...

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第五届专用集成电路国际会议（asicON）

作者： Member IEEE ASIC and System state-key Lab. Fudan University Shanghai 200433

Embedded systems need a low-cost and high-performance microprocessor. And Java has been used widely in embedded systems like smart card. But most general processors execute Java bytecode instructions inefficiently and difficultly in software based on "soft" Java Virtual Machines. Our 32-bit RISC with java extension overcomes the conflict. The java extension of RISC, based on a 32-bit RISC and easy to switch to a java processor, can spend less cost to obtain the capability of efficient executing of native RISC instruction and java CVM bytecode instructions, which is convenient for consumers on many occasions and has better cost performance

关键词： The architecture of the Java Extension of 32-bit RISC for smart cards and other embedded systems

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An error distribution based nonlinear companding method for analog behavioral modeling via wavelet approximation

An error distribution based nonlinear companding method for ...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Xuan Zeng Jun Tao Yangeng Su Wenbing Chen Dian Zhou ASIC& System State Key Lab Fudan University Shanghai P.R.China Mathematics Dept. Fudan University Shanghai P.R.China E.C.E. Dept. University of Texas at Dallas Richardson TX USA

ISBN: (纸本)0780377613

In this paper, we develop a wavelet collocation method with nonlinear auto-companding for behavioral modeling of analog circuits. The companding function is automatically constructed according to the initial error distribution obtained through approximating the input-output function of the circuit blocks by conventional wavelet collocation method. Compared with the published modeling approaches, the proposed nonlinear auto-companding method works more efficiently not only in controlling the error distribution but also in reducing the modeling errors. A switched-current filter example is employed to demonstrate the promising features of the proposed method.

关键词： Function approximation Analog circuits Error correction Circuit simulation Nonlinear equations Acceleration Automatic control Filters Space exploration Curve fitting

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VLSI implementation of a high-performance 32-bit RISC microprocessor

VLSI implementation of a high-performance 32-bit RISC microp...

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International Conference on Communications, Circuits and systems (ICCCAS)

作者： Xiao Li Longwei Ji Bo Shen Wenhong Li Qianling Zhang ASIC&System State Key Lab Fudan Univ. Shanghai China

The microprocessor is one of the most important blocks of the SoC. Considering high-performance, we implement a 32-bit RISC microprocessor, named as FDU32, with instruction sets compatible with ARM7TDMI. By using 5-stage pipeline and improving the circuit structure, FDU32 obtains 67% increment in max clock rate, 11% reduction in CPI and 86% increment in MIPS compared with ARM7TDMI at the same 0.35 /spl mu/m CMOS process, and only the transistor count increases a little. FDU32 has passed the FPGA verification and taped out.

关键词： Very large scale integration Microprocessors Reduced instruction set computing Instruction sets Pipelines Data processing Registers Circuits Clocks Switches

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Theory of cross-coupled oscillator system for RF quadrature generation

Theory of cross-coupled oscillator system for RF quadrature ...

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IEEE International Conference on Circuits and systems for Communications (ICCSC)

作者： Jian Wang Jun Tan O. Wing ASIC and System State-Key-Lab Microelectronics Department Fudan University Shanghai China

Proves that a system consisting of a cross-coupled pair of certain subsystems that are themselves cross-coupled is capable of generating four signals that are exactly in quadrature and equal in amplitude. An RC oscill... 详细信息

关键词： Oscillators Radio frequency Signal generators Equations Coupling circuits RF signals Voltage Mathematical analysis Application specific integrated circuits Microelectronics

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A novel MEMS gas sensor with effective combination of high sensitivity and high selectivity

A novel MEMS gas sensor with effective combination of high s...

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Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectronics

作者： Zhou, Jia Li, Po Zhang, Song Zhou, Feng Huang, Yiping Yang, Pengyuan Minhang, Bao ASIC and System State Key Lab. Department of Microelectronics Fudan University 220 Handan Road Shanghai 200433 China Chemistry Department Fudan University 220 Handan Road Shanghai 200433 China Department of Mechanical Engineering Inst. of Petrochemical Technology E.-China Univ. of Sci./Technology 1166 Songjin Road Shanghai 201512 China

A novel MEMS gas sensor including a PZT thin film layer and a zeolite layer is developed in this paper, which shows effective combination of high sensitivity and high selectivity. Working in resonating mode, the sensor depicts the mass loading due to molecular adsorption of the zeolite by the frequency shift. The relationship between the frequency shift in percent and the concentration of Freon is linear. The minimum mass loading of 3.5×10-9g and the sensitivity of -0.0024%/ppm can be determined from the experimental results.

关键词： Chemical sensors

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Studies on the layout algorithm for CGH in OEMCM systems design

Studies on the layout algorithm for CGH in OEMCM systems des...

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4th International Conference on asic Proceedings

作者： Lai, Jing-Mei Zhang, Qian-Ling Huang, Pei-Zhong ASIC and System State Key Lab Fudan University Shanghai China

The main issue of this paper is the studies on the free-space optical interconnection (FSOI) technology and the correlative physical layout algorithm for computer generated hologram (CGH) in optoelectronic multi chip module (OEMCM) systems design. A new effective physical layout algorithm is also presented. The computer simulation results show that our algorithm is useful in dealing with the restricted space-position problems that occurred in massively interconnection networks. And the comparison of placement layout results between our new algorithm and several other algorithms indicates an advance.

关键词： Integrated circuit layout

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