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61.
H. P. Le K. Shah J. Singh A. Zayegh 《Analog Integrated Circuits and Signal Processing》2006,48(1):21-31
This paper presents design and implementation of a wireless pressure sensor system for biomedical application. The system
consists of a front-end Micro-Electro- Mechanical System (MEMS) sensing capacitor along with an optimised MEMS-based oscillator
for signal conditioning circuit. In this design, vertical fringed comb capacitor is employed due to the advantages of smaller
area, higher linearity and larger full scale change in capacitance compared to parallel plate counterparts. The MEMS components
are designed in Coventorware design suite and their Verilog-A models are extracted and then imported to Cadence for co-simulation
with the CMOS section of the system using AMI 0.6-micron CMOS process. In this paper, an optimisation method to significantly
reduce the system power consumption while maintaining the system performance sufficient is also proposed. A phase noise optimisation
approach is based on the algorithm to limit the oscillator tail current. Results show that for the pressure range of 0–300 mmHg
the device capacitance range of 1.31 pF – 1.98 pF is achieved which results in a frequency sweep of 2.54 GHz – 1.95 GHz. Results
also indicate that a 42% reduction of power consumption is achieved when the optimisation algorithm is applied. This characteristic
makes the sensor system a better candidate for wireless biomedical applications where power consumption is the major factor.
Hai Phuong Le received his B.E. (Hons) degree in Electronic and Computer System Engineering from University of Tasmania, Hobart, Australia
in 2000. He received his Ph.D. degree in Microelectronics from Victoria University, Melbourne, Australia in 2005. At present,
he is a post-doctoral research fellow and lecturer in the Centre for Telecommunications and Microelectronics, Victoria University.
His research and teaching interests include data acquisition system, mixed-signal integrated circuit design and wireless smart
sensor systems.
Kriyang Shah received his B.E. Degree in Electronics and Communication Engineering from Sardar Patel University, Vallabh Vidyanagar, Gujarat,
India and his Master Degree in Microelectronics in 2004. He is currently a Ph.D. research student in the Centre for Telecommunications
and Microelectronics, Victoria University, Melbourne, Australia. His research interests include MEMS Sensors, RF MEMS, process
integration for MEMS and CMOS and MEMS-CMOS co-simulation.
Jugdutt (Jack) Singh received his B.Sc. in Electronics Engineering from University of Brighton, UK and M.Sc. in Electronics Engineering from University
of Alberta, Canada in 1978 and 1986 respectively. He completed his Ph.D. at Victoria University, Australia in 1997. Since
1989 he has been at Victoria University, Melbourne, Australia. Currently he is a Professor of Microelectronics in the Centre
for Telecommunications and Microelectronics at Victoria University. His major area of research interests are in the RF, analog
and mixed signal design, reconfigurable architectures, low power VLSI circuits and systems design. He has published number
of articles in education and research in microelectronics and small technologies area.
Aladin Zayegh received his B.E. degree in Electrical Engineering from Aleppo University in 1970 and Ph.D. degree from Claude Bernard University,
France in 1979. In 1980, he joined the Faculty of Engineering, Tripoli, Libya. Since 1984 he has held lecturing position at
Victoria University, Melbourne, Australia. He is currently an Associate Professor and the Head of School in the School of
Electrical Engineering, Faculty of Health, Engineering and Engineering and Science at Victoria University. His research interest
includes microprocessor-based system, instrumentation, data acquisition and interfacing, and microelectronics. 相似文献
62.
63.
针对传统的通过转速与光刻胶膜厚的关系来大致判断膜厚范围的问题,研究了基于单色光干涉的光刻胶膜厚测量方法。基于光刻胶的基本特性,将油膜的膜厚测量方法应用在光刻胶上。基于薄膜干涉原理进行系统的光路设计以及光刻胶膜厚测量平台的设计。进行了干涉条纹自动计数算法的研究以及基于单色光干涉的相对光强原理的研究。最后搭建硬件系统和软件系统,对干涉条纹自动计数算法与单色光干涉的膜厚测量方法进行实验验证与分析,实现了光刻胶膜厚的快速精确测量。 相似文献
64.
65.
研制了一套线面同时成像任意反射面速度干涉仪(VISAR)用于激光驱动飞片速度场时空分辨测量。将传统VISAR改为成像干涉结构,用变像管扫描相机和高速光电分幅相机分别记录作为信号载体的梳状干涉条纹,实现靶面一条线上各点速度历史和多个时刻二维靶面上所有点速度的测量。所研制的线面同时成像VISAR具有小于10μm的空间分辨和约15m/s的速度分辨能力,线成像VISAR时间分辨小于50ps,面成像VISAR曝光时间小于5ns。用其测量了激光驱动带约束刀口铝膜飞片的速度场,给出了高时空分辨全场速度分布,从中可以清晰看出飞片的演化发展过程。实验结果表明,线面同时成像VISAR将是各种飞片产生技术及相应加载手段中全场速度诊断的有力工具。 相似文献
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68.
以北京城市边缘住区商业配套服务设施调研数据为基础,试图总结其商业发展面临的问题,并进一步分析其存在的原因,寻找解决措施。 相似文献
69.
通过对莱芜市钢城边缘区永兴路的空间解读,提出了构建整体性城市设计的目标,重点通过对带形区域的功能定位、城市空间形态重新进行评估和认识,对土地资源进行整合,研究确定城市边缘区城市设计的策略。 相似文献
70.
针对二次反射塔式太阳能热发电技术中二次反射镜面形精度要求高的特性, 利用2种条纹方向正交的直条纹图案将待测面形分解为2个正交方向的像素偏差量, 通过二次反射镜面形快速解算模型将像素偏差转换成镜面反射法线的偏差角, 实现了待测面面形的快速检测。然后, 对二次反射镜样品进行面形检测, 再将检测结果与基于关节臂测量机的检测结果进行了对比, 结果表明2种检测方法的检测结果相符。 相似文献