5.2GHz 0.18μm CMOS射频低噪声放大器的设计

采用TSMC 0.18μm CMOS工艺,设计应用于IEEE 802.11a的无线局域网络的低噪声放大器（LNA）。整个电路采用1.8V单电源供电,输入输出匹配良好。用ADS模拟软件对电路进行分析优化,结果表明：在中心频率5.2GHz处,噪声系数为2.51dB,功率增益为17.373dB。     

A New Scan Architecture for Both Low Power Testing and Test Volume Compression Under SOC Test Environment

A new scan architecture for both low power testing and test volume compression is proposed. For low power test requirements, only a subset of scan cells is loaded with test stimulus and captured with test responses by freezing the remaining scan cells according to the distribution of unspecified bits in the test cubes. In order to optimize the proposed process, a novel graph-based heuristic is proposed to partition the scan chains into several segments. For test volume reduction, a new LFSR reseeding based test compression scheme is proposed by reducing the maximum number of specified bits in the test cube set, s _max, virtually. The performance of a conventional LFSR reseeding scheme highly depends on s _max. In this paper, by using different clock phases between an LFSR and scan chains, and grouping the scan cells by a graph-based grouping heuristic, s _max could be virtually reduced. In addition, the reduced scan rippling in the proposed test compression scheme can contribute to reduce the test power consumption, while the reuse of some test results as the subsequent test stimulus in the low power testing scheme can reduce the test volume size. Experimental results on the largest ISCAS89 benchmark circuits show that the proposed technique can significantly reduce both the average switching activity and the peak switching activity, and can aggressively reduce the volume of the test data, with little area overhead, compared to the previous methods.

基于无线传感器网络门禁系统研究

介绍了一种操作方便、运行可靠的智能型无线门禁系统,系统前端探测器与主机微处理器之间传送数据采用无线方式,克服了有线式门禁系统布线的困难,避免了布线后会影响美观性的缺陷。系统采用模块化的设计思想,通过微控制器控制无线模块nRF905进而实现对TCS3C-TCD42A所采集的数据进行无线收发。该系统成本低、实用、可靠、功能灵活多样,可广泛用于银行、仓库和家庭等重要场所。     

VMM中功能覆盖率收敛技术

介绍SystemVerilogVMM验证方法学在LCDController验证中的应用,指出它相对于传统Verilog验证方法的1优点,重点研究功能覆盖率的收敛技术,实验比较了多种具体的实现方法。实验结果表明,由于CCT能够收集覆盖信息,形’成闭环负反馈,以控制随机变量的生成,从而在实现快速收敛的目标方面取得了显著的效果。     

AM-OLED微型显示器在红外系统中的应用

AM-OLED微型显示器由于其优良的性能,在红外系统图像显示方面有着广泛的应用。由于红外信号与显示图像的特殊性,需要对显示器的性能进行相关的优化,以达到优良的显示效果。通过相关研究,有效提升了与红外系统相配套的微型显示器的显示效果,特别在伽马校正与温度补偿方面做了深入研究,取得了较好的效果,具有良好的应用前景。     

改进的Householder多级维纳滤波方法

该文以GPS接收机空时抗干扰为应用背景,给出了一种改进的基于Householder多级维纳滤波的降维方法。该方法保留了原算法的前向递推过程,并利用多级维纳滤波的分解特性,对其后向迭代过程进行改进,得到一种阶递归的实现结构,大大提高了算法的实时性。分析表明,改进方法的运算复杂度与原算法接近,并远低于基于相关相减多级维纳滤波(CSS-MWF)的算法。仿真实验验证了算法的抗干扰性能。     

The impact of online brand community characteristics on customer engagement: An application of Stimulus-Organism-Response paradigm

The advent of interactive digital platforms has led people to progressively interact on such platforms, urging organizations to create online communities to engage customers with them and with each other to enhance brand loyalty. This study attempts to investigate what motivates customers to engage in these brand communities. Through a questionnaire survey of 430 Facebook users, this study investigates whether and how the unique characteristics (information quality, system quality, virtual interactivity, and rewards) of online brand communities affect customer engagement. The consequent effect of customer engagement on brand loyalty is also examined. This study frames and empirically validates a model for engaging customers with online brand communities on Facebook, considering the moderating role of gender. The Stimulus-Organism-Response paradigm is solicited to justify the theoretical background of this study. The data were analyzed using structure equation modelling. Results reveal that each of the characteristics positively influences customer engagement, with information quality and virtual interactivity bearing the strongest influence. Customer engagement also exhibits a strong positive impact on brand loyalty. This results further reveal that gender gap in the online environment is declining as the impact of all the four characteristics of online brand communities on customer engagement was invariable across male and female members.     

基于安全模块的嵌入式POS设计

银行卡支付功能的复杂化、多样化,金融IC卡广泛应用,对POS的计算能力、功能要求特别是安全性要求越来越高,而且POS机大都置于客户收款处,其应用环境较为恶劣,面临的威胁和攻击日益严重。针对POS机越来越高的性能和安全要求,论文采用基于安全模块的嵌入式系统构建POS系统,详细阐述了安全模块的硬件选型、安全相关的密钥方案、能显著地增加POS的处理能力、安全性和环境适应能力等。     

基于工业控制网络的系统集成

本文系统地论述了工业控制网络的系统集成方式,并对各种构成形式和特点进行了讨论,给出了具体的系统集成结构。通过造纸厂板纸机控制系统集成实例,表明了系统集成在生产制造领域中的重要作用。