共查询到20条相似文献,搜索用时 15 毫秒
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Source localization and beamforming 总被引:2,自引:0,他引:2
Distributed sensor networks have been proposed for a wide range of applications. The main purpose of a sensor network is to monitor an area, including detecting, identifying, localizing, and tracking one or more objects of interest. These networks may be used by the military in surveillance, reconnaissance, and combat scenarios or around the perimeter of a manufacturing plant for intrusion detection. In other applications such as hearing aids and multimedia, microphone networks are capable of enhancing audio signals under noisy conditions for improved intelligibility, recognition, and cuing for camera aiming. Previous developments in integrated circuit technology have allowed the construction of low-cost miniature sensor nodes with signal processing and wireless communication capabilities. These technological advances not only open up many possibilities but also introduce challenging issues for the collaborative processing of wideband acoustic and seismic signals for source localization and beamforming in an energy-constrained distributed sensor network. The purpose of this article is to provide an overview of these issues 相似文献
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Thomas Jacob Koickal Alister Hamilton Su Lim Tan James A. Covington Julian W. Gardner Tim C. Pearce 《IEEE transactions on circuits and systems. I, Regular papers》2007,54(1):60-73
In this paper, we present the analog circuit design and implementation of the components of an adaptive neuromorphic olfaction chip. A chemical sensor array employing carbon black composite sensing materials with integrated signal processing circuitry forms the front end of the chip. The sensor signal processing circuitry includes a dc offset cancellation circuit to ameliorate loss of measurement range associated with chemical sensors. Drawing inspiration from biological olfactory systems, the analog circuits used to process signals from the on-chip odor sensors make use of temporal "spiking" signals to act as carriers of odor information. An on-chip spike time dependent learning circuit is integrated to dynamically adapt weights for odor detection and classification. All the component subsystems implemented on chip have been successfully tested in silicon 相似文献
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Ogawa K. Ishizaki T. Hashimoto K. Sakakura M. Uwano T. 《Microwave Theory and Techniques》1989,37(9):1434-1441
A very compact 50-GHz-band transmitter/receiver for a video link is described. The RF assemblies used in the system consist of 25/50-GHz frequency doublers, a 25-GHz dielectric-resonator oscillator, and a 25-GHz FM modulator. The circuits make extensive use of microwave integrated circuit (MIC) technology with all GaAs FETs as active elements. The frequency doublers exhibit a minimum conversion loss of 2.6 dB and a maximum output power of 11 dBm. The modulator is highly frequency stabilized by the dielectric resonator. Recently developed miniature probe microstrip-to-waveguide transitions permit the MIC assemblies to be installed compactly in hermetically sealed packages. Design considerations and experimental data for the transition are presented. Using these technologies a transmitting power of 10 dBm and a receiver noise figure of 13 dB have been obtained 相似文献
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This paper analyzes the main challenges associated with noninvasive, continuous, wearable, and long-term breathing monitoring. The characteristics of an acoustic breathing signal from a miniature sensor are studied in the presence of sources of noise and interference artifacts that affect the signal. Based on these results, an algorithm has been devised to detect breathing. It is possible to implement the algorithm on a single integrated circuit, making it suitable for a miniature sensor device. The algorithm is tested in the presence of noise sources on five subjects and shows an average success rate of 91.3% (combined true positives and true negatives). 相似文献
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随着集成电路芯片制造工艺进入纳米阶段,电路可靠性问题变得越来越严重,以负偏置温度不稳定性效应为代表的电路老化也逐渐成为影响其性能的重要因素.基于老化预测的精确性和传感器功能的多样性,提出了一种抗老化、可编程的老化预测传感器.其中稳定性检测器部分利用反馈回路解决了浮空点问题,同时整合了锁存器部分,实现了对老化预测结果的自动锁存,从而增加了老化预测的精确度,减小了一定的面积开销.最后通过HSPICE模拟器仿真验证了该传感器的优越性,且与经典结构相比降低了约21.43%的面积开销. 相似文献
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Integrated circuit yield statistics 总被引:1,自引:0,他引:1
The random failure statistics for the yield of mass-produced semiconductor integrated circuits are derived by considering defect and fault formation during the manufacturing process. This approach allows the development of a yield theory that includes many models that have been used previously and also results in a practical control model for integrated circuit manufacturing. Some simpler formulations of yield theory that have been described in the literature are compared to the model. Application of the model to yield management are discussed and examples given. 相似文献
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《Microwave Theory and Techniques》1979,27(7):655-660
Experimental results on BaTi/sub 4/O/sub 9/ microwave integrated circuit (MIC) characteristics, including microstrip dispersion and loss, have shown excellent agreement with the theoretical predictions. Precision measurements of temperature stability were conducted at 14 GHz. The high dielectric constant (epsilon/sub r/ = 37) and its negative temperature coefficient can be used in specialized MIC's for application to advanced microwave subsystems. 相似文献
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Micromachined devices for wireless communications 总被引:15,自引:0,他引:15
Nguyen C.T.-C. Katehi L.P.B. Rebeiz G.M. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1998,86(8):1756-1768
An overview of recent progress in the research and development of micromachined devices for use in wireless communication subsystems is presented. Among the specific devices described are tunable micromachined capacitors, integrated high-Q inductors, micromachined low-loss microwave and millimeter-wave filters, low-loss micromechanical switches, microscale vibrating mechanical resonators with Q's in the tens of thousands, and miniature antennas for millimeter-wave applications. Specific applications are reviewed for each of these components with emphasis on methods for miniaturization and performance enhancement of existing and further wireless transceivers 相似文献
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介绍了氮化镓微电子器件的优势和现状。提出将GaNHEMT作为微波器件用于混合微波集成电路(MIC)和微波单片集成电路(MMIC),在射频输出功率、器件优值等方面,均具有明显优点,并列举了成功的例子。为了加快发展MMIC,必须解决好几个关键问题,即提高材料质量和尺寸,完善制造工艺,克服器件电流下降、增益过早饱和与射频输出功率退化等现象。 相似文献
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本文简要评逆相控阵用收发(T/R)组件的特点及发展概况,介绍了几种收发组件的电路,即混合微波集成电路(HMIC)、微型混合微波集成电路(MHMIC)以及单片微波集成电路(MMIC),并讨论了收发组件的制造工艺、电路组成、封装测试和成品价格。 相似文献
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CCD制造的关键工艺 总被引:1,自引:0,他引:1
CCD(电荷藕合器件)是一种在硅集成电路工艺线上制作的图像传感器.介绍了CCD的基本工作原理和制造的单项工艺,并详细介绍了其关键工艺:氧化、光刻、离子注入,还对各工艺所遇到的问题、相应的解决方法及发展状况进行了阐述。 相似文献
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Jin-Moon Nam Seung-Min Jung Dong-Hoon Yang Moon-Key Lee 《Circuits, Systems, and Signal Processing》2005,24(4):401-413
The application specific integrated circuit implementation of a
capacitive fingerprint sensor system-on-chip (SOC), which embeds
a 32-bit microcontroller for performing an identification
algorithm, is described for user authentication on small, thin,
and portable equipment. The SOC is composed of 160 × 192
array cells with a sensor detection circuit and an embedded
32-bit reduced instruction set
computer (RISC) microcontroller. The proposed sensor
detection circuit increases the voltage difference
between a ridge and valley about 80% more than
conventional circuits and minimizes an electrostatic
discharge influence by applying an effective
isolation structure. The 32-bit RISC microcontroller
is embedded by a latch base for low power and low
complexity. The test chip was fabricated on a
0.35 μm standard complementary metal oxide semiconductor
1-poly 4-metal process. 相似文献