微波功率器件的扇形线测试电路

在微波电路原理和半导体器件物理的基础上,设计和模拟了两种用于微波功率器件的测试电路,并且设计了与之配套的测试夹具.采用矢量网络分析仪对该测试电路和夹具在3～8GHz范围内进行了小信号测试.模拟和测试结果都表明,采用扇形线的测试电路性能较好.最后采用该电路和夹具对C波段AlGaN/GaN HEMT微波功率器件进行了微波功率测试,测试频率为5.4GHz.实验测得最大功率增益为8.75dB,最大输出功率为33.2dBm.     

微波功率器件的扇形线测试电路

在微波电路原理和半导体器件物理的基础上,设计和模拟了两种用于微波功率器件的测试电路,并且设计了与之配套的测试夹具.采用矢量网络分析仪对该测试电路和夹具在3～8GHz范围内进行了小信号测试.模拟和测试结果都表明,采用扇形线的测试电路性能较好.最后采用该电路和夹具对C波段AlGaN/GaN HEMT微波功率器件进行了微波功率测试,测试频率为5.4GHz.实验测得最大功率增益为8.75dB,最大输出功率为33.2dBm.     

微波功率器件的滤波器测试电路

在微波电路原理和半导体器件物理的基础上,设计和模拟了三种用于微波功率器件的测试电路,并且设计了与之配套的测试夹具.采用矢量网络分析仪对该测试电路和夹具,在3～8GHz范围内进行了小信号测试.模拟和测试结果表明,采用阶梯阻抗滤波器偏置网络的测试电路性能较好,比采用扇形线偏置网络的测试电路具有更宽的带宽.该滤波器偏置电路能够用来在整个C波段,即在4～8GHz内对微波功率器件进行测试.但是,微带叉指耦合电容没有起到取代贴片隔直电容的目的,原因是该结构对参数精度要求高,而PCB制作工艺无法满足这个要求.     

微波功率器件的滤波器测试电路

在微波电路原理和半导体器件物理的基础上,设计和模拟了三种用于微波功率器件的测试电路,并且设计了与之配套的测试夹具.采用矢量网络分析仪对该测试电路和夹具,在3～8GHz范围内进行了小信号测试.模拟和测试结果表明,采用阶梯阻抗滤波器偏置网络的测试电路性能较好,比采用扇形线偏置网络的测试电路具有更宽的带宽.该滤波器偏置电路能够用来在整个C波段,即在4～8GHz内对微波功率器件进行测试.但是,微带叉指耦合电容没有起到取代贴片隔直电容的目的,原因是该结构对参数精度要求高,而PCB制作工艺无法满足这个要求.     

紫外成像用高响应ZnS肖特基光电二极管阵列

基于分子束外延(MBE)生长技术,制备出了新颖的8×8 ZnS肖特基光电二极管阵列,研究了制备该器件的标准光刻,金属沉积,湿化学腐蚀,SiO2绝缘层沉积等一系列微电子处理工艺.该肖特基光电二极管阵列的光谱响应截止边为340nm.在400～250nm的可见光盲区域,光电响应测试显示该器件在截止边波长处具有0.15A/W的高响应度,相对应的量子效率为55%.成像测试显示该器件具有良好的紫外成像特性.     

紫外成像用高响应ZnS肖特基光电二极管阵列

基于分子束外延(MBE)生长技术,制备出了新颖的8×8 ZnS肖特基光电二极管阵列,研究了制备该器件的标准光刻,金属沉积,湿化学腐蚀,SiO2绝缘层沉积等一系列微电子处理工艺.该肖特基光电二极管阵列的光谱响应截止边为340nm.在400～250nm的可见光盲区域,光电响应测试显示该器件在截止边波长处具有0.15A/W的高响应度,相对应的量子效率为55%.成像测试显示该器件具有良好的紫外成像特性.     

应用无线红外技术的光互连器件的设计

旋转连接器是一种自由空间动态光互连器件.文章中利用无线红外技术设计了双通道动态光互连器件,分析了该器件的设计原理,测试了在不同情况下器件的传输速率.实验表明:在不同操作系统的计算机之间测试了该旋转连接器的性能,发现数据传输速率与发射计算机的操作系统和接收计算机的操作系统有关.在同一操作系统下,Win2000操作系统数据传输速率最高,为1.437Mb/s.     

基于各向异性导电膜的射频SP8T开关无损测试

为了解决射频器件无损测试的难点，基于各向异性导电膜Z轴(ACF-Z)连接结构，设计并实现了射频器件无损测试技术。针对表面贴装式GaAs金属半导体场效应晶体管(MESFET)单刀八掷(SP8T)开关，该测试技术使用ACF-Z轴连接结构实现器件与测试板的无损连接，通过矢量网络分析仪对GaAs MESFET SP8T开关性能进行测试，最多可同时测试SP8T开关的8个通道。测试结果显示，1～8 GHz内，器件的插入损耗为-1.5～-3.5 dB,回波损耗为-15～-35 dB,测试过程中未对器件造成损伤。     

日盲型AlGaN PIN紫外探测器的研制

采用MOCVD方法在双面抛光的(0001)蓝宝石衬底上生长了高铝组分AlGaN材料,研制出日盲型AlGaN PIN紫外探测器.详细介绍了该器件的结构设计和制作工艺,并对该器件进行了光电性能测试.测试结果表明:器件的正向开启电压约为4.5 V,反向击穿电压大于20 V;常温下(300 K),该器件在3 V反向偏压下的暗电流约为50 pA,在零偏压下270 nm处峰值响应度达到0.12 A/W,长波截止波长小于285 nm.     

基于SOI的16通道200GHz阵列波导光栅

设计并制作了基于绝缘体上硅(SOI)材料的1×16阵列波导光栅(AWG).该AWG器件的中心波长为1 550 nm,信道间隔为200 GHz,采用了脊型波导结构.首先确定了波导的结构尺寸以保证单模传输,并利用束传播法(BPM)模拟了波导间隔、弯曲半径和锥形波导长度等参数对器件性能的影响,对器件结构进行了优化,同时也利用BPM方法模拟了器件的传输谱.模拟结果显示:器件的最小信道损耗为4.64 dB,串扰小于-30 dB.根据优化的器件结构,通过光刻等半导体工艺制作了AWG,经测试得到AWG器件的损耗为4.52～8.1 dB,串扰为17～20 dB,能够实现良好的波分复用/解复用功能.     

Technology innovation and process integrations for sub-100nm gate patterning

This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration.     

White organic light-emitting devices based on fac tris（2- phenylpyridine） iridium sensitized 5,6,11,12-tetraphenylnap -hthacene

We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.     

Complete approach to automatic identification and subpixel center location for ellipse feature

To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

A Versatile Mixed-Signal Pin Approach for Cost-Effective Test of Automotive ICs

Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.     

社长序言（英文）

正Happy New Year!As we step into a new year,we take a look back at the key feature topics covered in China Communications over the past 12 months and set out our expecta-     

Call for Papers

正Introduction Jointly sponsored by the China Institute of Communications(CIC)and the IEEE Communications Society(IEEE ComSoc)since the year 2013,China Communications,currently,is aiming to gradually realise the transition from journal to magazine content and style.     

INTEGRATION OF OPTICAL AND WIRELESS NETWORKS

正For a long time,optical and wireless systems/net-works are developed in separate communities witha few attempts for in-depth convergence.In fact,it prom-ises many advantages to combine the optical and wire-less technologies in the levels of systems and networks.Recently,both academia and industry have made manyefforts to enter a new phase of development to take op-tical and wireless systems as fully integrated networks.To provide high bandwidth and reliable service for bothfixed and mobile users,a well-designed network must     

Call for Papers—Feature Topic,Vol.12,No.3,2015

正Smart Grid Communications The electric power industry is undergoing profound changes as the industry aims to capture the promise of a smart grid for a sustainable energy future.Enabled by the advanced sensing devices such as Phasor Measurement Units(PMUs),increasingly powerful