2.45 GHz 0.18 μm全差分CMOS低噪声放大器设计

设计了一个基于TSMC 0.18 μm CMOS工艺的2.45 GHz全差分CMOS低噪声放大器.根据电路结构特点,采用图解法对LNA进行功耗约束下的噪声优化,以选取最优的晶体管栅宽;设计了仅消耗15 μA电流的偏置电路;采用在输入级增加电容的方法,在改善输入匹配网络特性的同时,解决了栅极电感的集成问题.仿真结果表明:LNA噪声系数为1.96 dB,功率增益S_(21)超过20 dB,输入反射系数S_(11)和输出反射系数S_(22)分别小于-30 dB和-20 dB,反向功率增益S_(12)小于-30 dB,1 dB压缩点和三阶互调输入点IIP3分别达到-17.1 dBm和-2.55 dBm,整个电路在1.8 V电源下功耗为22.4 mW.     

应用于IEEE 802.11b无线局域网系统的2.4GHzCMOS单片收发机射频前端

实现了一个应用于IEEE 802.11b无线局域网系统的2.4GHz CMOS单片收发机射频前端,它的接收机和发射机都采用了性能优良的超外差结构.该射频前端由五个模块组成:低噪声放大器、下变频器、上变频器、末前级和LO缓冲器.除了下变频器的输出采用了开漏级输出外,各模块的输入、输出端都在片匹配到50Ω.该射频前端已经采用0.18μm CMOS工艺实现.当低噪声放大器和下变频器直接级联时,测量到的噪声系数约为5.2dB,功率增益为12.5dB,输入1dB压缩点约为-18dBm,输入三阶交调点约为-7dBm.当上变频器和末前级直接级联时,测量到的噪声系数约为12.4dB,功率增益约为23.8dB,输出1dB压缩点约为1.5dBm,输出三阶交调点约为16dBm.接收机射频前端和发射机射频前端都采用1.8V电源,消耗的电流分别为13.6和27.6mA.     

基于SiGe HBT工艺的GNSS接收机混频器设计

针对目前国内RFIC发展比较滞后的现状,设计了3款应用于GNSS接收机的基于0.5 μm SiGe HBT工艺的混频器(Ⅰ、Ⅱ、Ⅲ),并采用针对混频器的优良指数FOM(figure-of-merit)对这3个混频器进行结构和综合性能比较.3款混频器的供电电压为3.3 V,本振LO输入功率为-10 dBm,其消耗总电流、转换增益、噪声系数、1 dB增益压缩点依次为:Ⅰ)8.7 mA,15 dB,4.1 dB,-17 dBm;Ⅱ)8.4 mA ,10 dB,4.6 dB,-10 dBm;Ⅲ)5.4 mA,11 dB,4.9 dB,-10 dBm.而3款混频器的FOM分别为-57.8、-56.6、-54.3,表明混频器Ⅲ的综合性能最佳,混频器Ⅱ次之,最后为混频器Ⅰ.     

一种用于电视调谐器的宽带CMOS低噪声放大器设计

介绍了一种宽带CMOS低噪声放大器设计方法,采用噪声抵消技术消除输入MOS管的噪声贡献.芯片采用TSMC 0.25μm 1P5M RF CMOS工艺实现.测试结果表明:在50～860MHz工作频率内,电压增益约为13.4dB;噪声系数在2.4～3.5dB之间;增益1dB压缩点为-6.7dBm;输入参考三阶交调点为3.3dBm.在2.5V直流电压下测得的功耗约为30mW.     

4H-SiC MESFET大信号非线性特性分析

采用Voherra级数法对4H-SiC射频MESFET的大信号非线性特性进行了分析,并研究了器件尺寸与线性度的关系.模型考虑了陷阱效应对非线性特性的影响,模拟结果能够较好地反映实验结果.进一步分析表明,在1GHz和1.01GHz频率下,当栅长从0.8μm增大到1.6μm,器件的输入(输出)三阶截取点从33.55dBm(36.26dBm)减小到18.1dBm(13.4dBm),1dB压缩点从24dBm下降到7.43dBm.为实际器件的线性化设计提供理论依据.     

一种用于电视调谐器的宽带CMOS低噪声放大器设计

介绍了一种宽带CMOS低噪声放大器设计方法,采用噪声抵消技术消除输入MOS管的噪声贡献.芯片采用TSMC 0.25μm 1P5M RF CMOS工艺实现.测试结果表明:在50～860MHz工作频率内,电压增益约为13.4dB;噪声系数在2.4～3.5dB之间;增益1dB压缩点为-6.7dBm;输入参考三阶交调点为3.3dBm.在2.5V直流电压下测得的功耗约为30mW.     

一种输出匹配可调的、高线性度宽带功率放大器

采用自适应偏置技术和有源电感实现了一款输出匹配可调的、高线性度宽带功率放大器(PA)。自适应偏置技术抑制了功放管直流工作点的漂移,提高了PA的线性度。有源电感参与输出匹配,实现了输出匹配可调谐,该策略可调整因工艺偏差、封装寄生造成的输出匹配退化。利用软件ADS对电路进行验证,结果表明,在4 GHz频率下,输入1dB压缩点(Pin 1dB)为-7dBm,输出1dB压缩点(Pout 1dB)为11dBm,功率附加效率(PAE)为8.7%。在3.1GHz~4.8 GHz频段内,增益为(20.3±1.1)d B,输入、输出的回波损耗均小于-10dB。     

单片分布式放大器的研制

采用0.15μm GaAs pHEMT工艺,研制了单级和两级两种结构的微波毫米波单片分布式放大器.在设计中采用电阻-电容结构代替传统分布式放大器中的终端电阻以降低直流功耗,在输入端加入短路线增强静电保护.根据应用需求设计了相应的放大器电路结构,实现了两种分布式放大器,比较了这两种结构在增益与功率容限方面的特点.第1种分布式放大器采用单级四管结构,在10～40GHz频段内,增益为(9.4±1.1)dB,1dB压缩点最大输出功率为21.5dBm;第2种分布式放大器采用两级双管级联结构,在15～40GHz频段内,增益为(12.2±1.4)dB,1dB压缩点最大输出功率为17dBm.     

一种高线性短波宽带混频器的设计

采用双平衡场效应管结构和阻抗匹配技术设计了一种适用于短波宽带接收机的高线性混频器,通过调整场效应管的沟道宽度和偏置电压优化了混频器的性能指标.该混频器射频输入频率为1.5～ 30 MHz,本振输入频率为71.5～100MHz,中频输出频率为70 MHz.测试结果表明:输入三阶截点高于40 dBm,变频损耗小于7dB,1 dB压缩点高于12 dBm,单边带噪声系数小于7dB.     

A Wide-Band Low Noise Amplifier for Terrestrial and Cable Receptions

提出并设计了一种用于数字电视接收调谐芯片的宽带低噪声放大器.该设计采用0.35μm SiGe BiCMOS工艺,器件的主要性能为:增益等于18.8dB,增益平坦度小于1.4dB,噪声系数小于5dB,1dB压缩点为-2dBm,输入三阶交调为8dBm.在5V供电的情况下,直流功耗为120mW.     

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）.     

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     

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-     

云计算专题（英文）

正Cloud computing is a novel computing paradigm that utilizes remote cloud resources to achieve a high-performance computation.Cloud provides infrastructure,platform and software as different on-demand services.China has made remarkable progress in cloudbased products and operating system technology.The government,enterprises and research institutions are all active in the development of cloud computing-related projects.Despite the progress,many important problems     

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