电流检测型四段式线性高压恒流LED驱动芯片

文章基于CSMC 0.8μm 700VBCD工艺,采用检测驱动电流的方式,设计了1款非隔离4段式线性高压恒流发光二极管(light emitting diode,LED)驱动芯片,即将4个700 V双重扩散金属氧化物半导体(double-diffused metal oxide semiconductor,DMOS)功率开关管集成在芯片内部以实现分段点亮控制,在电压上升和下降阶段均能有效地完成对4段高压LED的分段驱动。仿真结果表明,在70~120Ω范围内调节片外限流电阻阻值可以实现驱动电流在29.5~44.5mA范围内连续改变,以调节LED光照强度。     

一种远程LED照明监控系统的设计

利用STC单片机结合以太网驱动模块,设计一种基于以太网的远程发光二极管(LED)照明监控系统.该以太网驱动模块由RTL8019以太网芯片及相关外围电路组成,利用电量采集芯片AD7755对整个系统所耗电量进行采集,采用大功率LED恒流驱动方案,并利用可调光芯片CAT4109和脉宽调制(PWM)技术对LED灯实现调光.结果表明:设计的系统可实时采集系统所耗电量,可对灯的亮度、色温进行远程调节.     

海外角

发光二极管 日本A＆F公司在市场上推出了一种发光二极管灯,其头部兼有开关功能,由耐冲击的树脂制成。该灯采用发光二极管和大口径的特殊光学透镜,内装单3型碱性电池或单3型锂电池2节,连续照明时间可达10～100h。大小为Φ30mm×153mm,重量约71g(含电池)。     

6.5万彩色显示PM-OLED控制与驱动芯片

为了支持并利用有机发光二极管(OLED)显示技术,设计一种适用于96×64无源OLED(PM-OLED)的显示控制与驱动芯片。该芯片可以实现6.5万彩色显示和256级对比度调节,驱动方法采用了脉冲幅度调制(PAM)。芯片不但集成了数字和模拟电路,而且兼容高电压和低电压同时工作。测试结果表明:在低压电源为3 V、高压电源为12 V的情况下,当列驱动单元输出电流为100μA时,驱动电路和显示屏的整体模块功耗约为770 mW,所设计的控制与驱动芯片能够正确显示彩色图像。     

6.5万彩色显示PM-OLED控制与驱动芯片

为了支持并利用有机发光二极管(OLED)显示技术,设计了一种适用于96×64无源OLED(PM-OLED)的显示控制与驱动芯片。该芯片可以实现6.5万彩色显示和256级对比度调节,驱动方法采用了脉冲幅度调制(PAM)。芯片不但集成了数字和模拟电路,而且兼容高电压和低电压同时工作。测试结果表明:在低压电源为3V、高压电源为12V的情况下,当列驱动单元输出电流为100μA时,驱动电路和显示屏的整体模块功耗约为770mW,所设计的控制与驱动芯片能够正确显示彩色图像。     

金属氧化物薄膜晶体管及其在新型显示中的应用

为适应高分辨率、大尺寸的液晶(LCD)和有源有机发光二极管(AMOLED)等新型显示技术发展的需要,开发了一种新型的基于金属氧化物有源半导体材料的薄膜晶体管(MOTFT)驱动面板.文中阐述了MOTFT的材料、器件结构、制作工艺以及应用,并对影响MOTFT性能的因素进行了讨论.研发团队开发的MOTFT的迁移率最高可达21.6cm2/(V.s),阈值电压为1.63V,开关比为109,亚阈值摆幅为0.216 V/decade.基于该MOTFT驱动面板,在国内率先实现了5英寸彩色AMOLED显示屏.该MOTFT驱动面板具有迁移率高、制作工艺简单、成本较低以及容易实现大面积等优势,在LCD和AMOLED等新型显示领域具有广泛的应用前景.     

滞环电流控制型大功率LED恒流驱动芯片的设计

基于标准CMOS工艺,采用滞环电流控制模式,设计了一款新型大功率LED恒流驱动芯片。在标准CMOS工艺范围内,芯片能够实现良好的恒流驱动功能。结果表明,电源电压从3到5V变化时,输出电流保持良好的一致性,其最大值和最小值之差仅为0.075mA;随着温度的升高,输出电流先增大后减小,在电路工作的整个温度区间内,输出电流仅仅变化0.165mA;在电感为理想电感情况下,当芯片驱动7个LED灯时,效率最高可达97.8%。     

0.8V低功耗高速1∶2分频器

采用UMC0.13μm CMOS标准工艺,设计并实现了一种最高工作频率为17GHz的1∶2分频器芯片.该芯片由基本分频器单元和输入输出缓冲组成.设计中为使分频器在低电源电压下正常工作,通过分析不同高速锁存器的结构特点,选择单端动态负载锁存器作为基本分频器单元.对单端动态负载锁存器进行直流分析可知,降低电源电压对采样模式的影响比保持模式大.在片测试结果表明:芯片电源电压最低可达0.8V;当电源电压为0.8V时,芯片在3～17GHz频率范围内正常工作;当输入信号频率分别为3和17GHz时,在10MHz频偏处,输出信号的相位噪声分别为-124.44和-120.62dBc/Hz.芯片面积为412μm×338μm,总功耗为3.84mW.     

基于放大器的新型混频器设计

设计了一种低电压、低功耗的新型混频器,主要应用于2.4 GHz ISM频段的无线通信系统中.先设计了一个2级放大器,再在2级放大器的中间插入1对吉尔伯特开关,就构成了一个基于放大器的混频器.混频器的供电电压为0.8 V,功耗为1.05 mW,三阶交调点为3.82 dBm,芯片面积为0.429 mm².在7 dBm的本振信号下,混频器具有13 dB的转换增益.     

高亮度蓝绿发光二极管芯片制造技术研究

高亮度发光二极管（HB—LED）芯片制造是介于外延片生产和芯片封装的中间过程,通过光刻、等离子刻蚀（ICP）、掩模（PECVD）、电子束真空蒸发镀膜、研磨抛光、划片、裂片、点测等工艺技术研究,实现高亮度发光二极管芯片生产的产业化。由于具有体积小、低能耗、冷光源、使用寿命长、环保等特点,蓝、绿光LED应用前景十分广泛,比如全彩显示屏、背光源、汽车刹车灯、装饰灯、交通信号灯、景观照明以及通用照明等。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-