共查询到20条相似文献,搜索用时 15 毫秒
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近年来,随着SOI技术的快速发展,SOI集成电路的ESD保护已成为一个主要的可靠性设计问题。介绍了SOI ESD保护器件方面的最新进展,阐述了在SOI ESD保护器件设计和优化中出现的新问题,并进行了详细的讨论。 相似文献
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This paper presents a low‐cost RF parameter estimation technique using a new RF built‐in self‐test (BIST) circuit and efficient DC measurement for 4.5 to 5.5 GHz low noise amplifiers (LNAs). The BIST circuit measures gain, noise figure, input impedance, and input return loss for an LNA. The BIST circuit is designed using 0.18 μm SiGe technology. The test technique utilizes input impedance matching and output DC voltage measurements. The technique is simple and inexpensive. 相似文献
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通过改变LED及光电探测器(PD)的 空间分布,得到不同的天线布局,同时通过改 变LED间距dTX、发射端和接收端平面的高度差h等条件,得到了不同的信道传输矩阵H,仿 真分析了以上各种情况下的室内可见光通信系统(VLC)的性能。结果表明,影 响VLC性能的关键参数包含最小欧式距 离dmin和行列式Det(H)。根据系统的关键 参 数,将天线布局分为圆形布局和格点布局两类,圆形布局是指所有LED或PD均 匀地分布在一个 圆上,而格点布局是指所有LED或PD均分布在二维平面中的格点上。仿真结果表明,当dTX变化时,在采 用圆形布局的系统中,行列式Det(H)是影响误码率(BER)的关键因素 ;在采用格点布局的系统中,dmin和Det( H)均是影响系统误码率的关键因素,但在d TX的一定范围内dmin是决定系统性能的关键因素 。而当h发生变化时Det(H)是影响系统性能的 关键因素。 相似文献
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A fully differential architecture has numerous advantages in a switched-capacitor delta-sigma modulator such as immunization
to clock-induced noise, supply rejection, simple sign conversion of integrator gain and doubled output dynamic range. Efficient
use of the fully differential architecture nevertheless requires a completely symmetrical layout and routing, which may contradict
with the requirements of component matching. Some design choices have to be made at this point, depending on what requirements
can be compromised. This paper discusses the importance of certain layout features which may serve as a guide in making these
design choices.
Hakan Binici was born in Istanbul, Turkey, in 1969. He received his B.Sc. and M.Sc. degrees respectively from Istanbul Technical University
and the Bogazici University in Istanbul in 1989 and 1995. Since 1997 he has been working as a research scientist at the Electronics
Laboratory of the University of Oulu in Finland. He is currently continuing his research towards a Ph.D. His research interests
focus on low-voltage, low-power analog VLSI systems and ΔΣ modulators.
Juha Kostamovaara received the degrees of Dipl. Eng, Licentiate of Tech. and Doctor of Tech. in electrical engineering in 1980, 1982 and 1987,
respectively, all from the University of Oulu, Finland. He was Acting Associate Professor of Electronics in the Department
of Electrical Engineering at the University of Oulu in 1987–1993, and was nominated Associate Professor from the beginning
of 1993. During 1994 he worked as an Alexander von Humboldt Scholar at the Technical University of Darmstadt, Germany. In
1995 he was invited to become full Professor of Electronics at the University of Oulu, where he is currently also head of
the Electronics Laboratory. Prof. Kostamovaara's main interest is in the development of high-speed electronic circuits and
systems and their applications in electronic and optoelectronic measurements and radio mobile telecommunications.
An erratum to this article can be found at 相似文献
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This paper describes the characteristics of a new CAD tool that enables the creation of layout libraries of selected analog modules. This Analog Modules Generator (AMG) automatically creates multiple layout versions of two commonly used analog structures: the differential pair and arrays of series-connected or stacked devices, for the subsequent generation of layout libraries. Based on the number of devices and rows defined by the user for the layout implementation, the tool validates all possible implementations, which are later saved in a database. Additionally, an extraction process can be optionally executed over all the layout views saved in the database. The AMG generates several reports with all the characteristics of the implemented layouts, including area and parasitic components, facilitating further statistical processing. We describe the features and capabilities of the proposed AMG tool, and several test cases are presented. Results show that suitable layout implementations can be achieved by layout and circuit designers in a very reduced amount of time. 相似文献
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鉴于超声换能器(换能器)传统驱动电路中存在发射效率低,激励信号有拖尾的问题,该文提出了一种改进型驱动电路方案。首先,对换能器匹配和激励信号拖尾吸收的理论进行说明,并从匹配和拖尾吸收等方面综合考虑对驱动电路进行改进;其次,采用一发一收的机制,在600m60型钢轨上搭建实验平台,并对传统无匹配、有匹配驱动电路和该文设计的驱动电路的性能进行对比。实验结果表明,与传统无匹配驱动电路相比,改进型驱动电路消除了激励信号拖尾且波形光滑,接收信号中心频点相对幅值提高了98.97%;与传统有匹配驱动电路相比,改进型驱动电路消除了激励信号拖尾且波形光滑,接收信号中心频点相对幅值提高了50.45%。 相似文献
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Digital curve acquisition with a vision system introduces a large amount of degradation. At the same time ‘corners’ convey important visual information. Unfortunately they are found in the same spectral domain as the quantization noise. Low-pass filtering of the curvature function is compared with more sophisticated methods that keep the angles ‘sharp’. An automated inspection is successfully performed, demonstrating the efficiency of a new method. 相似文献
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针对分级式设计规则检查的实用化所面临的一系列问题,如效率问题,伪错问题以及进一步优化等。分析限产生这些问题的原因和版图的结构特点,提出了上应的解决方案和改进措施。 相似文献
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In real‐world intelligent transportation systems, accuracy in vehicle license plate detection and recognition is considered quite critical. Many algorithms have been proposed for still images, but their accuracy on actual videos is not satisfactory. This stems from several problematic conditions in videos, such as vehicle motion blur, variety in viewpoints, outliers, and the lack of publicly available video datasets. In this study, we focus on these challenges and propose a license plate detection and recognition scheme for videos based on a temporal matching prior network. Specifically, to improve the robustness of detection and recognition accuracy in the presence of motion blur and outliers, forward and bidirectional matching priors between consecutive frames are properly combined with layer structures specifically designed for plate detection. We also built our own video dataset for the deep training of the proposed network. During network training, we perform data augmentation based on image rotation to increase robustness regarding the various viewpoints in videos. 相似文献
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在自动测控和通信系统的调试、维修时,必然会遇到多种噪声.为了揭示噪声的根源,采用实验的手法,去观察、分析前置放大电路关键点电压及信号的波形,根据前置放大电路内部结构与实际需要,优化电路的结构,采用优质半导体元器件、光电耦合器和耦合变压器来抑制噪声.实践中,使用这些措施,避免了自控、通信设备信号失真大、共模干扰强,线性差、带宽窄、隔离性能不良等缺点,对提高设备的性能达到了事半功倍的效果. 相似文献