静电驱动悬臂梁数模转换器设计、分析与模拟

提出了一种新型的微电子机械数模转换器(MEMDAC)--静电驱动悬臂梁数模转换器.与传统的静电驱动悬臂梁执行器相比,新的结构能更精确地控制梁的挠度.文中给出了此MEMDAC的设计、分析和模拟过程.有限元(FEA)分析表明此MEMDAC的最大输出位移为1.51μm,分辨率为0.1μm,其最大非线性误差为0.03μm.     

静电驱动微机电数模转换器的结构设计

由于静电驱动具有结构简单、响应时间短和功耗小等优点,在微执行器中得到了广泛的应用。随着应用范围的不断扩大,实际使用中对微执行器的精度和稳定性提出了越来越高的性能要求,使得传统的模拟电压驱动方式逐渐向数字电压驱动转移以满足这些要求。基于传统的静电驱动方式,提出了一种全新的纵向数字电压驱动方式,以期得到高精度、高稳定性的驱动源。根据这一思想,在传统的悬臂梁结构的基础上,采用条状电极,实现了微机电数模转换器(MEMDAC)的结构设计,并借助ANSYS软件完成了结构分析与模拟,证明了设计的可行性。     

一种新颖微机械数模转换器的模拟与设计优化

提出了一种基于权间隙原理的微机械数模转换器 (WGDAC) ,它与电路中的权电阻数模转换器的原理类似 ,利用间隙的长度作为比例因子 ,从而实现由二进制电压输入到模拟位移输出的转换 .给出了有限元方法分析对由热执行器阵列驱动的数模转换器的输出位移分析的结果 .为了减小误差 ,对结构作了优化设计 ,使误差不大于0 .0 0 2 μm     

一种用于数模转换器的电流-电压转换电路

介绍了一种用于数模转换器的电流 电压转换电路。在数模转换器的负载电阻片内集成的情况下 ,利用文中提出的电流 电压转换电路 ,数模转换器实现了要求的宽摆幅电平输出 (全“0”输入时 ,输出低电平 - 3V ;全“1”输入时 ,输出高电平 3 5V)。整个数模转换器电路用 1 2 μm双层金属双层多晶硅n阱CMOS工艺实现。其积分非线性误差为 0 4 5个最低有效位 (LSB) ,微分非线性误差为 0 2LSB ,满摆幅输出的建立时间小于 1μs。该数模转换器使用± 5V电源 ,功耗约为 30mW ,电路芯片面积为 0 4 2mm2 。     

一种GSM无线发射系统中的低功耗数模转换器

针对GSM标准无线发射系统中数模转换器(DAC)的要求,分析了影响其性能和功耗的限制因素,并在SMIC 0·13μm CMOS工艺1.2 V电源电压下设计了一款10位电流驱动型数模转换器(Current-steering DAC).使用最佳拟合线的算法衡量电流源匹配的随机误差对DAC静态非线性的影响,使得DAC的电流源...     

一种新颖微机械数模转换器的模拟与设计优化

提出了一种基于权间隙原理的微机械数模转换器(WGDAC),它与电路中的权电阻数模转换器的原理类似,利用间隙的长度作为比例因子,从而实现由二进制电压输入到模拟位移输出的转换.给出了有限元方法分析对由热执行器阵列驱动的数模转换器的输出位移分析的结果.为了减小误差,对结构作了优化设计,使误差不大于0.002μm.     

高速SOIMOS器件及环振电路的研制

设计了一种 1 0位 50 MS/s双模式 CMOS数模转换器 .为了降低功耗 ,提出了一种修正的超前恢复电路 ,在数字图象信号输出中 ,使电路功耗降低约 30 % .电路用 1μm工艺技术实现 ,其积分线性误差为 0 .46LSB,差分线性误差为 0 .0 3LSB.到± 0 .1 %的建立时间少于 2 0 ns.该数模转换器使用 5V单电源 .在 50 MS/s时全一输入时功耗为 2 50 m W,全零输入时功耗为 2 0 m W,电路芯片面积为 1 .8mm× 2 .4mm.     

一种100dB输出动态范围的1.5bit功率数模转换器

介绍了一种1.5bit的双声道过采样数模转换器.它把过采样数模转换器和D类功率放大器这两部分集成在一起,不需要额外的低通滤波器即可直接驱动耳机扬声器等语音设备.它无需消耗直流功耗,对于常用的8Ω扬声器负载,其最大输出功率可达436mW,输出动态范围大于100dB.该电路采用TSMC 0.18μm工艺实现.芯片面积为0.28mm2,其中数字电路的电源电压为1.8V,D类功率放大器的电源电压为3.3V.     

一种100dB输出动态范围的1.5bit功率数模转换器

介绍了一种1.5bit的双声道过采样数模转换器.它把过采样数模转换器和D类功率放大器这两部分集成在一起,不需要额外的低通滤波器即可直接驱动耳机扬声器等语音设备.它无需消耗直流功耗,对于常用的8Ω扬声器负载,其最大输出功率可达436mW,输出动态范围大于100dB.该电路采用TSMC 0.18μm工艺实现.芯片面积为0.28mm2,其中数字电路的电源电压为1.8V,D类功率放大器的电源电压为3.3V.     

LCoS伽马校正电路的研究

提出了一种应用于硅上液晶(LCoS)的伽马校正电路.双梯电阻数模转换器是伽马校正电路的一个重要组成部分.双梯电阻数模转换器由粗分电阻级和细分电阻级组成,其最大优点是占用版图面积小.提出的10位双梯电阻数模转换器仅由80个电阻、2个4-16译码器、1个2-4译码器和一些开关组成,供电电压是5 V.该数模转换器由0.35μm CMOS工艺实现.后仿真结果表明,数模转换器的微分非线性和积分非线性分别小于±0.5 LSB和±0.4 LSB.最后,对伽马校正电路进行了仿真,给出了伽马校正电路输出的液晶伽马校正曲线,仿真结果表明伽马校正电路能够满足LCoS显示系统的要求.

Abstract：

One gamma correction circuit for liquid crystal on silicon (LCoS) is proposed. Dual ladder resistor DAC (Digital to Analog Converter) is one of main components of the gamma correction circuit. Dual ladder resistor DAC consists of coarse resistor stage and fine resistor stage. The most advantage of the DAC is that its layout area is small. In this paper, the proposed 10-bit dual ladder resistor DAC only requires eighty resistors, two 4-to-16 decoders, one 2-to-4 decoder and some switches with a supply voltage of 5 V. This DAC is implemented by 0.35 m CMOS technology. The post simulation results that its differential non-linearity (DNL) and integral non-linearity (INL) are less than 0. 5 LSB and 0. 4 LSB, respectively. Meanwhile, the gamma correct circuit was simulated, and the gamma correction curve of liquid crystal is given. Simulation results show that the gamma correction circuit can meet the requirements of LCoS display system.     

GEMNET: a generalized, shuffle-exchange-based, regular, scalable,modular, multihop, WDM lightwave network

GEMNET is a generalization of shuffle-exchange networks and it can represent a family of network structures (including ShuffleNet and de Bruijn graph) for an arbitrary number of nodes. GEMNET employs a regular interconnection graph with highly desirable properties such as small nodal degree, simple routing, small diameter, and growth capability (viz. scalability). GEMNET can serve as a logical (virtual), packet-switched, multihop topology which can be employed for constructing the next generation of lightwave networks using wavelength-division multiplexing (WDM). Various properties of GEMNET are studied     

Thermodynamics of copper matte converting: Part III. Steady-state volatilization of Au,Ag, Pb,Zn, Ni,Se, Te,Bi, Sb,and As from slag,matte, and metallic copper

A comprehensive compilation of various thermodynamic data required for a complete analysis of copper matte converting reactions is presented. The data comprise estimated free energies of formation for such gases as SeO, SeS, TeO, TeS, BiO, BiS, SbO, SbS, AsO, and AsS, as well as activity coefficients in dilute copper alloys and vapor pressures of various elements and compounds. The volatilization of minor elements in steady-state reactors comprising gas and several condensed phases is mathematically formulated, and a parameter which governs the volatilization in such reactors is defined and named volatilization constant. The vapor pressures of various volatile species are calculated thermodynamically for the Noranda Process reactor by assuming equilibrium conditions. The volatilization constants of various minor elements are expressed explicitly as functions of oxygen and sulfur activities. Formerly Associate Professor, Department of Metallurgical Engineering, University of Utah, Salt Lake City, UT     

PBX技术.市态.营销.选购

本文介绍了ＰＢＸ交换机的技术及市场需求态势。并提出ＰＢＸ产品的营销要素及其用户在选购时应遵循的原则。     

Novel planar, square-shaped, dielectric-waveguide, single-, and dual-mode filters

This paper presents a novel concept of a square-shaped dielectric-waveguide resonator, which can easily realize a dielectric-waveguide cross-coupled filter or a dielectric-waveguide dual-mode filter, using the conventional printed circuit board (PCB) process. This planar dielectric-waveguide resonator has a higher Q value than a microstrip resonator. The physical mechanisms of both single- and dual-mode filters are elucidated. Some new coupling structures are developed for undergoing the PCB process. Filter design procedures are detailed. Design curves for the coupling coefficients of internal- and external-coupling structures are determined by full-wave finite-element-method electromagnetic calculations. Measurement results are highly consistent with theory for all trial filters. This study offers an effective means of producing low-cost high-performance planar circuit filters.     

Bits, symbols, bauds, and bandwidth

The use of clear, concise, and unambiguous language in telecommunications engineering is vital to communicate a desired meaning and understanding. Terminology should be based on rigorous engineering principles and traceable to well known and dependable sources. This article deals with four everyday terms commonly encountered in the popular semi-technical press as well as in serious engineering periodicals. The misuse of these and other terms can lead to low-balled cost proposals, court litigation, and patent infringement cases. Imagine how an engineering student can be confused when she/he typically encounters bandwidth measured in bits per second     

人工智能时代“微机原理与接口技术”教学探讨

本文简述了在人工智能时代，我们的“微机原理与接口技术”课程教学团队基于线下线上混合教学模式，开展微机原理与接口技术的关键知识单元讲解的同时，实时课程思政，讲好微机原理的新故事；如何培养学生自主探索式学习技能，在课程基本知识单元学习的基础上扩展延伸相关深度学习、GPU技术、Python语言、FPGA技术等人工智能方面的知识单元的探究与学习，使得课程学习与人工智能的前沿发展相结合，理论联系实际，吸引和培养学生对该课程学习的兴趣和整体知识面扩展，这对于我们培养具有自主创新的科学探索精神的高素质专业人才具有重要的现实意义。