加速自校正直流漂移的可编程增益放大器

设计了一种应用于移动数字多媒体广播系统终端的可编程增益放大器.该可编程增益放大器采用源极反馈电阻可变的差分放大器结构,且带有直流漂移校正电路.分析了校正直流漂移时间的决定因素,通过采用双带宽切换的方法加速校正过程.分析了引发输出直流漂移发生变化的因素,设计了增益控制信号触发的双带宽控制信号发生电路.可编程增益放大器采用TSMC 0.25μm CMOS工艺.仿真结果表明,放大器的动态范围为30~84db,2db步进,对输入直流漂移的校正效果为-21.45db,加速后的直流漂移校正时间约15μs.     

星载多光谱CCD相机电子电路研制

研制的多光谱CCD相机采用线阵CCD推扫方式成像，具有5个成像谱段，每个谱段的敏感器阵列由3片CCD拼接而成，给出了相机电子电路部分的总体设计方案。采用各片CCD信号串行读出的方法形成两路视频信号，简化了星上数据处理电路。设计了直流差分耦合电路，使信号直流漂移降到20mV以下，采用无源滤波器抑制信号噪声，在保证奈奎斯特频率衰减小于0.5dB的前提下，使信号随机噪声降到了2mV以下。     

A DC-Offset Cancellation Scheme in a Direct-Conversion Receiver for IEEE 802.11a WLAN

提出了一种符合IEEE802.11a无线局域网的5GHz直下变频接收机解决直流漂移的方法. 该方法利用双平衡混频器输出端的模拟反馈环路消除直流漂移. 该混频器经过测试，在5.15GHz频率下具有9.5dB的转换增益，13.5dB的噪声系数和7.6dBm的三阶交调，在3.3V电源电压条件下67mW的功耗，以及1.73mV的直流漂移，并能使直流漂移减少76%. 该方案及整个直下变频的WLAN接收机已经采用0.35μm SiGe BiCMOS工艺流片并测试.     

一种低功耗混合信号直流失调消除电路

设计了一种应用于直接变频接收机的低功耗混合信号直流失调消除(DCOC)电路。该电路采用混合信号的方式消除直流失调电压,避免了传统模拟域直流失调消除系统环路响应速度与高通带宽之间的折中,具有功耗低、建立时间快、面积小等优点。采用该DCOC后,直接变频接收机的输出剩余直流失调电压小于37mV,直流失调消除环路的建立时间小于200μs。电路采用0.13μm CMOS工艺实现,芯片尺寸为0.372mm×0.419mm,工作于1.2V电源电压时,消耗电流仅为196μA。     

低电流比例失调的无电阻带隙基准电压源

提出了一种改善电流比例失调的无电阻带隙基准电压源。该电路将传统源耦差分对结构的电压转换器改进为共源共栅结构电流镜,并引入了一对额外的电流镜来钳制漂移,显著改善由沟道长度调制效应所引起的电流镜失调,同时减小了电流比例系数的温度漂移。设计了自偏置电路、启动电路以及简单二阶补偿电路,采用0.5μm BCD工艺仿真,在5 V工作电压下,输出电压有效温度系数为19.8×10–6/(℃–45~+125℃),低频电源抑制比PSRR为–50dB,工作电压在4.0~6.5 V变化时,输出电压变化小于17 mV,电路总功耗约300μW。     

油水两相流电容层析成像系统电容测量电路的设计

微小电容检测是电容层析成像技术的一个关键和难点。针对油水两相流电容层析成像系统的具体要求，本文研制一种微小电容交流测量电路。电容测量电路的静态测量误差小于0.2％，漂移为0.05％/小时。实验结果表明满足使用要求。     

直流式温控电路零漂的补偿

推导出运算放大器零点漂移的计算公式，介绍了恒温晶体振荡器的直流式恒温电路的恒温原理及零点漂移的补偿方法。     

直流式温控电路零漂的补偿

推导出运算放大器零点漂移的计算公式，介绍了恒温晶体振荡器的直流式恒温电路的恒温原理及零点漂移的补偿方法。     

光接收机用0.5mV高灵敏度带有接收信号强度指示的200MbpsCMOS限幅放大器

采用CSMC 0.6μm 2P2M CMOS工艺设计并实现了0.5mV高灵敏度,72dB超宽动态范围的200Mbps CMOS限幅放大器.该电路详细分析和设计了一种新型的有源直流漂移消除环路获得这一性能.利用信号通路中的限幅放大器,实现了基于分段线性近似的接收信号强度指示电路.信号检测的动态范围高达60dB,对数精度小于2dB.整个电路在5V单电源下工作,功耗为60mW.芯片有效面积为1.05mm2.     

光接收机用0.5mV高灵敏度带有接收信号强度指示的200Mbps CMOS限幅放大器

采用CSMC 0.6μm 2P2M CMOS工艺设计并实现了0.5mV高灵敏度,72dB超宽动态范围的200Mbps CMOS限幅放大器.该电路详细分析和设计了一种新型的有源直流漂移消除环路获得这一性能.利用信号通路中的限幅放大器,实现了基于分段线性近似的接收信号强度指示电路.信号检测的动态范围高达60dB,对数精度小于2dB.整个电路在5V单电源下工作,功耗为60mW.芯片有效面积为1.05mm2.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first