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2008 9th International Conference on Solid-state and Integrated-Circuit technology, ICSICT 2008

作者： Zhang Zeng, Xiaoyang Li, Jian Xie, Lei Guo, Yawei State Key Lab. of ASIC and System Fudan University Shanghai 201203 China Comlent Technology Inc. Shanghai 201203 China

ISBN: (纸本)9781424421855

A 8-b 125MS/s pipelined Analog-to-Digital Converter (ADC) used in DVB-S2 is presented in this paper. Based on reviewing low-power design techniques of high speed ADCs, several technologies are used in the design including the SHA-less architecture to reduce the power dissipation significantly. Detailed analysis is given about the relationship between the closed loop bandwidth (BW close) and the current of operational amplifier (OPAMP) used in Multiply Digital-to-Analog Converter (MDAC) to get the lowest power dissipation which can satisfy the ADC. The ADC is realized in SMIC 0.18um 1P6M CMOS process and according to the simulation results, the SNDR is 48dB with the power of 23.5mW. © 2008 IEEE.

关键词： Operational amplifiers

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Tool-path generation algorithm of sculptured surface by 3-axis swing grinding

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Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing systems, CIMS 2008年第7期14卷 1417-1420页

作者： Fan, Li-Cheng Du, Zhi-Jiang Sun, Li-Ning State Key Lab. of Robotics and System Harbin Institute of Technology Harbin 150080 China

In conventional Numerical Control (NC) machining of sculptured surface based on triangular facet model, to calculate each Cutter Location (CL) point of the flatted cutter, only few facets were actually used in the calculation of the tool projection region. However, most calculations were conducted to search those triangular facets overlapped by the tool projection region from the total facet set. To overcome such weakness, a novel rectangle envelope method was proposed, in which most facets outside the projection region were filtered out. During the course of a searching process, all facets overlapped by the tool projection region were saved independently so as to avoid searching the total STL (STereo Lithography) file again in next steps. For each facet overlapped by the tool projection region, the CL point was calculated by the cutter contract points with the vertexes, sides and the plane, finally the tool-path was obtained. Simulation experiment was used to demonstrate the feasibility of the proposed method.

关键词： Grinding (machining)

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Improved flickermeter model for incandescent lamp based on heat balance equation

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2008年第9期23卷 118-124页

作者： Yong, Jing Sun, Caixin Zeng, Liqiang Zhang, Na Hu, Jie State Key Lab. of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 China

IEC flickermeter has been widely accepted as an international standard for flicker severity measurement. But it is unable to measure flickers caused by high frequency interharmonics. This paper analyzes the cause of the problem. Based on the heat balance equation and thermal radioluminescence characteristics of incandescent lamp, the equation of luminous flux of lamp that can express the impact of interharmonic is established and an improved flickermeter model is proposed. Comparison between computer simulation of models and lab.experiment results show that the improved flickermeter model can overcome the IEC flickermeter deficiency effectively.

关键词： Incandescent lamps

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Single link tracking scheme based on UWB localization

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Journal of systems Engineering and Electronics 2009年第6期000卷

作者： Xiao Zhu Xiong Hailiang Yu Quan Yi Kechu State Key Lab. of Integrated Service Networks Xidian Univ. Xi'an 710071 P. R. China School of Electronic Science and Engineering National Univ. of Defense Technology Changsha 410073 P. R. China State Key Lab. of Integrated Service Networks Xidian Univ. Xi'an 710071 P. R. China State Key Lab. of Integrated Service Networks Xidian Univ. Xi'an 710071 P. R. China Inst. of China Electronics Equipment System Engineering Corporation Beijing 100039 P. R. China

To investigate the low-complex and high-precise tracking method, a novel single link tracking scheme based on UWB localization is proposed. Two antenna arrays are settled at the fixed station (FS) to receive the UWB signal from mobile terminal (MT), one FS is enough for the proposed scheme to track the MT. The UWB multipath detection algorithm for time difference of arrival (TDOA) estimation is presented and TDOA is thus adopted to estimate angle of arrival (AOA), avoiding the synchronization and complicated beamforming for AOA. The impacts of localization errors, concluding multipath and non-line-of-sight (NLOS) errors are simulated for the proposed track scheme. It is demonstrated that the simulation curve can match the real target moving, and the feasibility of the proposed scheme is proved.

关键词： ultra-wide band localization single-link tracking angle of arrival estimation

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Silicide as diffusion source for dopant segregation in 70-nm MOSFETs with PtSi Schottky-barrier source/drain on ultrathin-body SOI

Silicide as diffusion source for dopant segregation in 70-nm...

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9th International Conference on ULtimate Integration of Silicon, ULIS 2008

作者： Qiu, Z.J. Zhang, Z. Lu, J. Liu, R. Östling, M. Zhang, S.-L. State Key Lab. of ASIC and System School of Microelectronics Fudan University Shanghai China School of Information and Communication Technology Royal Institute of Technology Stockholm Sweden Angstrom Laboratory Uppsala University Uppsala Sweden

ISBN: (纸本)9781424417308

In this paper, dopant segregation (DS) method is adopted to enhance device performance of PtSi-based Schottky-barrier source/drain MOSFETs (SB-MOSFETs) fabricated on ultrathin silicon-on-insulator. The DS formation is realized by means of Suicide As Diffusion Source. Without DS treatment, the devices are typically p-type, but with a rather large electron branch at positive gate bias. Dopant segregation with As is found to turn the devices to well-performing n-MOSFETs, and DS with B to greatly enhance the hole conduction in the p-MOSFETs. A large threshold voltage (Vt) shift is however observed in the p-MOSFET due to B lateral spread caused during the drive-in process for the DS formation. By reducing the drive-in temperature, this problem is partially addressed with a smaller Vt shift and a much better control of short channel effect. © 2008 IEEE.

关键词： Threshold voltage

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Role of Si implantation in control of underlap length in Schottky-Barrier source/drain MOSFETs on ultrathin body SOI

Role of Si implantation in control of underlap length in Sch...

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9th International Conference on ULtimate Integration of Silicon, ULIS 2008

作者： Qiu, Z.J. Zhang, Z. Olsson, J. Lu, J. Hellström, P.-E. Liu, R. Östling, M. Zhang, S.-L. State Key Lab. of ASIC and System School of Microelectronics Fudan University Shanghai China School of Information and Communication Technology Royal Institute of Technology Stockholm Sweden Angstrom Laboratory Uppsala University Uppsala Sweden

ISBN: (纸本)9781424417308

This works demonstrates a novel approach using Si implantation prior to Pt deposition and PtSi formation to control the underlap length between the PtSi source/drain regions to the gate in Schottky-Barrier (SB-) MOSFETs. Dopant segregation at the PtSi/Si interface is used to enhance device performance. With the Ion/Ioff current ratio as an indicator, optimized Si implant doses are found for both n- and p-channel SB-MOSFETs. Through an effective barrier width, the underlap length has direct implication on the leakage current. © 2008 IEEE.

关键词： Schottky barrier diodes

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Stochastic stabilization of networked control systems with time-varying sampling periods

Stochastic stabilization of networked control systems with t...

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2008 11th IEEE International Conference on Communication technology, ICCT 2008

作者： Wang, Yan Sun, Zeng Qi School of Automation Science and Electrical Engineering Beihang University Beijing 100084 China State Key Lab. of Intelligent Technology and Systems Department of Computer Science Tsinghua University Beijing 100084 China

ISBN: (纸本)9781424422517

This paper presents a stochastic control method for networked control systems(NCSs) with time-varying sampling periods and random delay. The random delay of the NCS is modelled as intervals governed by a Markov chain. With the switching of the sampling periods, a discrete-time Markovian jump system with parameter uncertainties is presented to model the NCS. By introducing a delay-compensating control term, we construct an augmented state feedback controller. The controller gains can be constructed via LMIs using the stochastic Lyapunov function approach. An example is given to show the proposed results. © 2008 IEEE.

关键词： Networked control systems

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IF filter for GSM and WCDMA

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Guti Dianzixue Yanjiu Yu Jinzhan/Research and Progress of Solid state Electronics 2008年第1期28卷 114-118+123页

作者： Zhou, Zhujin Li, Ning Su, Yanfeng Ren, Junyan ASIC and System State Key Lab. Fudan University Shanghai 200433 China Sicomm RF Technology Corporation Shanghai 200433 China

Based on SMIC 0.35 μm mixed signal process, a forth-order active-opamp RC low-pass filter used in GSM/WCDMA communication system is presented. The filter meets the bandwidth specifications of the PDC and WCDMA standards especially the high IIP3, and shares the maximum number of components between the two modes. The total area is 1578 μm × 515 μm. The operational amplifiers with adjustable GBW were used to optimize GSM-mode power consumption. The capacitance matrix was used to tune the cutoff frequency with the consideration of the varieties of the temperature and technology. Also, the capacitances were made partially over-laping to reduce the resistance spread. The measured noise figure is 56 dB and 43 dB in the GSM and WCDMA modes, respectively. In the WCDMA mode, the IIP3 is 34 dBm, and the power dissipation is 17.9 mW;While in the GSM mode, the circuit consumes 11.3 mW. The supply volatge is 3.3 V.

关键词： Operational amplifiers

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Novel scheme of draw-out power supply utilized in transmission line state monitoring

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Dianli Xitong Zidonghua/Automation of Electric Power systems 2008年第1期32卷 76-80页

作者： Li, Xianzhi Du, Lin Chen, Weigen Wang, Youyuan Sun, Caixin Li, Jingyan State Key Lab. of Transmission and Distribution Equipment and Power System Safety and New Technology Chongqing University Chongqing 400044 China

A novel scheme of draw-out coils which are utilized in the power supply of the transmission-line state parameters online monitoring system is proposed, aiming at the ubiquity of problems in existing literatures that the draw-out coils are prone to deep saturation and high heat consumption, and thus the circuits are complex. These problems are resolved through introducing an air-gap magnetic resistance to the draw-out coils, as well as properly matching parameters such as the configuration of the coil, the material of the magnetic core, turn numbers and air gap length. Then a power supply equipment is developed based on the draw-out coil aforementioned. Integral test results illustrate that the power supply provides stable outputs with no saturation and low heat consumption throughout the alternating range of conducting currents. Besides, this paper analyzes the influence of abnormal large currents through the conductor on reliability of the power supply. Detailed measures to enhance the reliability are presented thereon. Short circuit and impulse current tests show that the measures proposed are capable of restraining the demolishment from electrodynamic force and overvoltage caused by the abnormal large current.

关键词： Electric lines

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Study of software fault tolerance system evaluation strategy

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Wuhan Daxue Xuebao (Xinxi Kexue Ban)/ Geomatics and Information Science of Wuhan University 2008年第10期33卷 1018-1021页

作者： Liu, Xin Yin, Qian Guo, Ping Lab. of Pattern Recognition and Intelligent System Beijing Normal University 19 Xinjiekou Beijing 100875 China State Key Laboratory of Computer Science Institute of Software CAS 4 Zhongguancun Beijing 100080 China

Software fault tolerance technique is used to ensure high reliability. In order to evaluate the quality of fault-tolerant systems, expected execution time and cost must be considered. A new evaluation strategy is proposed to evaluate, evaluating the system with three groups of quality factors, which is the capability, the time and the cost. By using them, the system's integrative quality factor can be calculated. When applying this strategy, we compare the quality of software systems which is consist of different fault-tolerant components. The results can be used to improve fault-tolerant system. To achieve the required optimal result, several optimization schemes are given to meet different project demands.

关键词： Quality control

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