RF-MEMS load sensors with enhanced Q-factor and sensitivity in a suspended architecture

In this paper, we present and demonstrate RF-MEMS load sensors designed and fabricated in a suspended architecture that increases their quality-factor (Q-factor), accompanied with an increased resonance frequency shift under load. The suspended architecture is obtained by removing silicon under the sensor. We compare two sensors that consist of 195 μm × 195 μm resonators, where all of the resonator features are of equal dimensions, but one’s substrate is partially removed (suspended architecture) and the other’s is not (planar architecture). The single suspended device has a resonance of 15.18 GHz with 102.06 Q-factor whereas the single planar device has the resonance at 15.01 GHz and an associated Q-factor of 93.81. For the single planar device, we measured a resonance frequency shift of 430 MHz with 3920 N of applied load, while we achieved a 780 MHz frequency shift in the single suspended device. In the planar triplet configuration (with three devices placed side by side on the same chip, with the two outmost ones serving as the receiver and the transmitter), we observed a 220 MHz frequency shift with 3920 N of applied load while we obtained a 340 MHz frequency shift in the suspended triplet device with 3920 N load applied. Thus, the single planar device exhibited a sensitivity level of 0.1097 MHz/N while the single suspended device led to an improved sensitivity of 0.1990 MHz/N. Similarly, with the planar triplet device having a sensitivity of 0.0561 MHz/N, the suspended triplet device yielded an enhanced sensitivity of 0.0867 MHz/N.     

铁电存储器和IC卡

铁电薄膜与半导体集成产生了新一代非易失存储器，与传统的半导体非易失存储器比较具有突出的优点，是新一代ＩＣ卡的理想存储芯片。     

35V高压CMOS集成电路的设计

随着高压电路的广泛应用，高低压兼容电路的设计变得越来越重要。本文以VFD电路高压输出级部分的设计为例，对高压CMOS电路的设计，从工作原理、结构设计等多方面进行阐述。     

新IC解决老问题

新款放大器IC可用于解决一些老问题,使工程师能够简化电路,改善性能、降低成本、减少器件数量,并节省电路板空间.     

SMT优化系统的设计与实现

基于SMT系统优化的旅行商问题（TSP）进行了分析和研究,对SMT系统优化进行了系统分析设计,介绍了如何减少X-Y工作台运动,提出两种针对环球HSP贴片机最优路径的优化算法,并基于一种方法编程实现了基本方案。最后在HSP贴片系统上使用本解决方案,大幅度提高了生产效率,证明了本解决方案的优越性和高效性,同时也为用其它算法...     

A sensitive, rapid ferricyanide-mediated toxicity bioassay developed using Escherichia coli

A need for rapid toxicity techniques has seen recent research into developing new microbiological assays and characterising their toxicity responses using a range of substances. A microbiological bioassay that determines changes in ferricyanide-mediated respiration for toxicity measurement (FM-TOX) shows particular promise. The development and optimisation of an improved FM-TOX method, incorporating novel features, is described using Escherichia coli as the biocatalyst. Omission of an exogenous carbon source, used in previously described FM-TOX assays, substantially improves the assay sensitivity. In addition, the development of a two-step procedure (toxicant exposure followed by determination of microbial respiratory activity) was found to enhance the inhibition of E. coli by 3,5-dichlorophenol and four other toxicants, compared to single-step procedures. Other assay parameters, such as the ferricyanide concentration, exposure times and optical density of the biocatalyst were also optimised, sometimes based on practical aspects. Toxicity tests were carried out using the adopted technique on both organic and inorganic toxicants, with classic sigmoid-shaped dose-response curves observed, as well as some non-standard responses. IC₅₀ data is presented for a number of common toxicants. The optimised assay provides a good foundation for further toxicity testing using E. coli, as well as the potential for expanding the technique to utilise other bacteria with complementary toxicity responses, thereby allowing use of the assay in a range of applications.     

Volume Images Vector Display Based on a Diffractive Screen

A white light system based on a 65 cm × 35 cm diffractive screen is demonstrated to be capable of displaying three-dimensional figures with continuous horizontal parallax. Three computer-controlled mirrors and a diffractive-refractive optical system are employed for positioning each element of the figure. No visual accessories are necessary and more than one observer can watch it simultaneously.     

基于XML的AutoCAD图形与SVG图形转换研究

SVG是W3C支持的最新网络图形图像标准.文章介绍和分析了AutoCAD的图形数据库以及它的对象结构模型,介绍了SVG的特点及其文档对象模型.基于上述分析,建立两者之间的对象元素映射关系.最后,我们根据这一映射关系给出一个应用实例,实例证明了通过给出的映射关系可以实现将AutoCAD图形(二维)转换为SVG图形.     

IC CAD中的图形运算算法与实现

熊猫系统是一个基于全定制ASIC,同时能完成半定制ASIC设计的完整的ICCAD系统。GOA(Geometric Operations and Analysis tool)是其中的完成图形算术、逻辑、拓扑运算的工具及软件库。本文将介绍它的作用及其与其它工具的关系,并详细介绍了其算法及我们在α测试和β测试中针对速度和精度要求所做的改进工作。     

模拟IC输入输出阻抗／噪声的计算机分析

本文叙述了用计算机分析模拟IC的噪声特性和输入/输出端口特性的原理和程序设计。