CMOS脉搏血氧采集传感器信号处理电路设计

针对脉搏波信号幅度小噪声大等问题,提出并设计了一款基于CMOS的脉搏血氧采集传感器信号处理电路.采用UMC 0.18 μm 1P6M CMOS工艺进行设计,提出一种能有效放大微弱信号、减小噪声且滤除高频信号的信号处理电路,从而使信号达到模数转换的输入范围.芯片测试结果表明:该芯片在1.8V单电源的供电下,输出动态范围为0.7V~1.4V,芯片的可变增益范围为30 dB~54 dB,共模抑制比和电源抑制比均大于88 dB,芯片的总体功耗为360 μW,达到了预期的效果.     

基于TIA/EIA-899标准的TYPE-I型M-LVDS接收器设计

提出了一种基于TIA/EIA-899标准的TYPE-I型M-LVDS接收芯片的实现方案,设计了一种新颖的共模搬移电路在实现超越电源电压轨的共模输入范围的同时简化了后级电路设计,节约了面积和功耗,电路中预放大器将输入信号放大一定倍数,迟滞比较器为系统引入迟滞效果。芯片采用GSMC0.18μm 1P6M CMOS工艺流片验证。测试结果表明,该芯片共模输入范围为-1.4V~3.8V,信号传输速率大于250 Mbps,具有典型值为28mV的迟滞效果。     

基于降压DC转换器的误差放大器的设计

结合Buck型DC-DC转换器的工作原理,从系统的稳定性和响应速度要求出发,提出一种高性能误差放大器及环路补偿方案。该误差放大器具有高的共模抑制CMRR和高的电源抑制比PSRR。电路结构采用CSMC 0.5μm BCD工艺,仿真结果表明,该误差放大器共模抑制比为106 dB,电源抑制比为129 dB,其性能良好,满足DC-DC转换器的系统需要。     

基于SoC FPGA的心电信号检测系统设计

设计实现了一种基于片上系统现场可编程门阵列( SoC FPGA)的心电信号( ECG)检测系统.系统通过具有高输入阻抗、高共模抑制比和低噪声的前置采集放大电路,实现心电信号的拾取和预处理.通过基于SoC FPGA的硬件平台和移植的嵌入式Linux开发环境的软硬协同设计方式,完成了心电信号的A/D转换、VGA显示、Micro SD卡数据存储和心电信号算法处理,能够对心电信号进行小波分析和QRS波检测,实现了对心电信号的采集、显示、存储和处理.     

蓝牙心电采集终端的设计与实现

现阶段医护用心电(ECG)监护设备价格昂贵,移动性差。为此,设计了一套基于ADS1298的蓝牙心电采集终端。采集终端主要由微控制单元(MCU)、采集前端、蓝牙模块以及不同压值电源等部分组成。终端选取TM4C123GH6PM系列单片机作为控制芯片。该控制芯片具有高效的信号处理及浮点运算功能,同时集成了高级运动控制的脉冲宽度调制(PWM)和正交编码器接口(QEI)及精密模拟信号处理功能,并且延续了Cortex-M处理器的低功耗、低成本和易使用的优点。使用TI芯片ADS1298采集人体心电信号。芯片内置右腿驱动放大器、威尔逊中心终端(WCT)以及PACE检测电路等,可持续进行导联脱落的检测。数据经过处理后,存储于SD卡,并在LCD液晶屏实时显示心电波形。选用蓝牙芯片与外界设备交互,通过蓝牙端口对接传输心电图数据。电路板采用电源隔离及滤波芯片以消除工频干扰,结合无限脉冲响应(IIR)、有限脉冲响应(FIR)数字滤波技术实现信号杂波消除。该心电采集终端具有体积小、功耗低的特点,用户操作简单、使用方便。     

低噪声高分辨IC测试系统设计

集成电路(IC)测试要求高速、高分辨率、高信噪比的信号采集系统,设计一套合适的采集系统具有极其重要的意义.论文分析了IC测试系统的组成原理,设计了低噪声信号调理电路并分析噪声系数;设计了可调相位延迟的时钟采样电路,有效实现低抖动的延迟;分析了误差对系统的影响,建立时间交替采样模型,有效校正了误差.测试表明,系统可有效实现高速高分辨的IC采集系统,达到16位分辨率、1 G采样率,波形误差达到63 dB,有效位数达到近12位,达到设计的要求.     

高精度低噪声MEMS陀螺仪电容读出电路

在研究电容式微机械陀螺信号通路工作原理的基础上,分析了影响电容式读出电路精度的各种非理想因素并进行了量化计算,设计了一款低噪声电容读出电路。该芯片采用高频调制原理实现了低频噪声的转移,同时提出了一款具有高电源抑制比的低噪声运算放大器,采用连续时间的电容读出方法研制了微机械陀螺ASIC电路。该芯片采用0.5μm CMOS工艺,芯片面积为3.5mm×3.4 mm,测试结果表明,该单片ASIC的输出级噪底为-117 dB,当陀螺仪量程为±300°/s时,分辨率可以达到0.00035°/s。     

低功耗便携式多导联心电信号采集系统设计

针对家用医疗监护领域的需求,设计了一种低功耗、便携式多导联心电信号采集系统。采用直流耦合方法,通过生物电位测量ADS1298模拟前端,实现微弱心电信号的采集。在模拟前端中,心电信号经过可编程仪表放大器进行放大,进入24位高分辨率模/数转换器(ADC)转换成数字信号;采用STM32F103微处理器进行控制,通过低功耗ZigBee实现心电信号的无线传输;设计了预处理电路、右腿驱动和屏蔽线驱动电路减小了高频和共模干扰;系统采用锂电池供电,体积小(7 cm×8 cm×2 cm),功耗低(214. 5 m W)。实验结果表明:设计的系统能长时间、稳定、有效地提取心电信号。     

表面肌电信号采集电路的设计

表面肌电信号是一种伴随肌肉活动的生物电现象,其采集电路设计的关键在于从强大噪声背景中提取微弱信号并进行高增益放大;通过分析表面肌电信号的特点和电路模型,设计了包含隔直和初级放大器、50Hz陷波器、高通和低通滤波电路三大部分的采集电路;该电路共模抑制比不小于115dB;输入阻抗大于100MΩ;增益为86dB;采用专用芯片UAF42的陷波器工频滤波衰减约30dB;将其应用于假肢手的控制系统中,通过神经网络进行动作模式识别,共识别了6个手部动作模式,识别成功率在95%以上。     

基于TIA/EIA-899标准的TYPE-Ⅰ型M-LVDS接收器设计

提出了一种基于TIA/EIA-899标准的TYPE-Ⅰ型M-LVDS接收芯片的实现方案,设计了一种新颖的共模搬移电路在实现超越电源电压轨的共模输入范围的同时简化了后级电路设计,节约了面积和功耗,电路中预放大器将输入信号放大一定倍数,迟滞比较器为系统引入迟滞效果.芯片采用GSMC0.18 μm 1P6M CMOS工艺流片验证.测试结果表明,该芯片共模输入范围为-1.4V～3.8V,信号传输速率大于250 Mbps,具有典型值为28 mV的迟滞效果.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.