低功耗超高频RFID标签芯片基带控制器

在分析RFID标签芯片系统架构的基础上,设计了一款适用于超高频射频识别标签芯片的基带控制器,以支持ISO 18000-6 Type C标准协议的RFID标签芯片的设计与实现.该基带控制器从系统架构和关键电路设计两个方面进行低功耗的系统集成优化设计,工作主时钟频率采用1.28 MHz,解码电路的采样时钟频率采用2.56 MHz,并采用TSMC 0.18 μm工艺对面积和功耗进行仿真验证和实现评估.仿真结果标明:该基带控制器符合ISO 18000-6 Type C标准协议,芯片面积0.16 mm2,芯片功耗20.07 μW,能够满足无源射频识别标签芯片的低成本和低功耗的需求.     

基于MSP430的手持式RFID读写器的设计

根据识别目标位置不固定不宜采用固定式系统的应用要求,设计了一种基于MSP430单片机的手持式RFID读写器.在介绍RFID读写器组成结构的基础上,重点介绍MSP430F149单片机采用SPI接口方式与RF收发芯片FM1702SL的硬件接口及相应软件的设计方法.应用表明,该手持式RFID读写器的设计达到相应的技术指标要求,具有良好的市场应用前景.     

矿井人员定位系统硬件电路应用设计

结合矿井无线传输的特点,根据RFID射频识别技术、超低功耗的芯片特性以及UCOS-Ⅱ实时操作系统的特性,对矿井人员定位系统的硬件电路进行了详细设计。系统的读卡器采用ARMS3C2410为主控CPU,标签采用TI公司的低功耗MSP430F2011单片机作为主控芯片,采用NRF2401芯片作为射频芯片。构建了矿井人员定位系统的硬件设计。在该硬件的基础上,完成相应的软件设计。实现了煤矿入井人员的实时跟踪监测和定位,为事故抢险提供了科学依据。     

基于低功耗SoC的微型图像采集系统设计

针对低成本和低功耗的物联网SoC芯片发展要求,基于SMIC 55 nm CMOS工艺,以低功耗开源处理器RI5CY的SoC芯片为平台,结合片内含有DSP与A/D转换功能的低电压CMOS图像传感器OV7725,设计并实现了一款基于开源RISC_V指令集架构SoC芯片的图像采集控制系统.文中介绍了图像采集控制系统的结构,并详细阐述基于AHB总线的图像采集控制器的设计.控制器采用一种改进的异步FIFO来实现不同时钟域的同步设计,具有小面积和低功耗的特点.通过Modelsim仿真、DC综合以及FPGA验证,结果表明:该系统实现了视频图像数据的采集和传输,操作流程简单,易于软件调试,支持应用最高带宽可达37 MB/s. SoC芯片系统的时钟主频为200 MHz,芯片总面积为3 250×3 648μm2,总功耗仅为24.419 mW.     

一种RFID传感网络的设计方案

针对井下人员定位的需求,提出一种RFID传感网络设计方案,实现了硬件选型和电路的优化设计。RFID读卡器和识别卡分别采用低功耗MSP430149和MSP430F2012为控制芯片,以低功耗无线射频收发芯片NRF903为核心配合外围滤波、检波、调制、放大电路等实现通信。     

基于ZigBee技术的无线RFID读写系统

将ZigBee技术与RFID技术相结合,设计一套无线RFID读写系统.在系统硬件结构中,以CC2530作为射频模块的微控制器和ZigBee无线通信节点的射频芯片,以MFRC522作为读写器的射频芯片.在VS2008平台上构建可移动RFID读写器应用软件.通过实验验证,该系统能够实现长距离识别,且数据信息的可靠性和保密性高,成本低,灵活性和扩展性好.该系统可以拓宽RFID读写器的应用范围.     

基于分层结构的RFID读卡系统的开发架构

RFID 读卡系统被广泛用于系统认证和控制，具有简单、高效、成本低的特点。但系统开发较为复杂，涉及电路设计、接口设计、单片机编程等多个领域。本研究利用分层协议开发了一个RFID读卡系统，其核心技术是用IIC和UART协议包装RFID读写芯片的命令以节约系统的接口资源。本设计利用了分层结构，将系统芯片控制与用户应用分离，并为用户建立了可以进行业务开发的API应用层，提高了RFID芯片的易用性和开发效率。应用效果表明该系统设计完全满足使用要求。     

单节锂离子电池保护电路的改进

提出了一种低成本的单节锂电池保护回路系统,采用0.6μm混合信号CMOS工艺和修调技术使芯片具有低功耗、高精度检测电压等特点.通过基准电路和取样电路设计的改进,使保护电路实现了多种保护功能,并且具有很高的检测电压精度.模拟结果表明,该电路在温度为25℃时过充电保护电压的检测精度达到了±25mV,耗电流仅为3.5μA,满足高精度检测电压的要求.     

一种低功耗时钟芯片的设计

讨论了一种低功耗时钟芯片的设计，从CMOS电路功耗产生原因入手，在振荡分频电路中减小电路工作电压，在时序电路中采用门控技术，达到降低功耗的目的，经流片后测试表明该芯片工作电流0．17mA，满足低功耗要求。     

复旦学报(自然科学版)第45卷(2006)总目次

一种适用于DVB系统的低复杂度Reed-Solomon解码器…………………………………………苏佳宁,田骏骅,沈泊,等(1)FPGA逻辑资源测试图形自动生成方法………………………………………………………………………欧阳怡荣,童家榕(6)一种适用于RFID系统的低功耗检波器设计和实现…………     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that