电子信息工程英语论文300词

A Low-Cost and Low-Power CMOS Receiver Front-End for MB-OFDM Ultra-Wideband Systems要该文全文，更换别的论文，或要中英文对照都可以找我Mahim Ranjan, Member, IEEE, and Lawrence E Larson, Fellow, IEEE0Abstract—This paper presents an RF receiver front-end for MB-OFDM-based ultra-wideband (UWB) The receiver occupies only 35 in a 18 CMOS process and consists of a low-noise amplifier, downconverter and a bandpass There are no on-chip inductors and the receiver requires no off-chip matching The measured receiver gain is 21 dB, noise figure is less than 6 dB, input IIP3 is 6 dBm, and the receiver consumes 5 mA from a 3 V The receivercovers all the MB-OFDM bands from 1 to 8 GHIndex Terms—CMOS, distortion, OFDM, receiver, ultra wideband, UWBI INTRODUCTIONULTRA-WIDEBAND (UWB)multi-band orthogonal frequency-division multiplexing (MB-OFDM) systems have been proposed as an emerging solution to wireless communicationapplications requiring high data rates (up to 480 Mb/s) over short In one proposed version [1], the carrier, with a bandwidth of 528 MHz, can hop to one of 14 channels（2904+528n,n=123…14）, divided into four groups of three channels and one group of two This representative time-frequency interleaving for a Group 1-only systemis depicted in F Design of a receiver for such a systempresents many challenges due to the wide bandwidth of the RF front- However, to assure the widest possible adoption, RF portions of these systems should consume little DC power and die area, and be implemented in a standard CMOS These last requirements argue against the use of on-chip inductors wherever Since theUWBfront-end intrinsically possesses a wide bandwidth, it is open to reception of undesired narrowband signals such as 11 a/b/g and the recently proposedWiMAX [2] systems, as shown in F Although OFDM systems are less susceptible to relatively narrowband jammers, nonlinearities in the receiver can result in jammer cross-modulation with wideband input signals, resulting in reduced signal-to-noise ratio (SNR) and a degradation in system performance [3] In addition, received wideband signals (from other UWB transmitters) can intermodulate and the resulting products can land in a desired Since the system is inherently wideband, harmonic distortion of a single unwanted UWB transmitter can also produce in-band distortion products and reduce the SNR For the system to successfully operate in such a hostile environment, the linearity specifications of the receiver need to include these distortion F Representative time-frequency interleaving pattern of a Group 1MB-OFDM signal [1] F Representative spectrum at an MB-OFDM receiver This paper describes a UWB heterodyne receiver front-end that is designed to minimize the effects of wideband jammers from a variety of undesired sources [4] In addition, the receiver is designed to minimize silicon area, so on-chip inductors are not The receiver architecture is presented in Section II Specifications for the receiver are derived in Section III Detailed block design is presented in Sections IV–VI Layout and packaging of the chip is discussed in Section VII Measured results are presented in Section VIII, followed by a conclusion in Section IXII RECEIVER ARCHITECTUREWhen it comes to designing a low-power and low-cost receiver, the traditional choice is a direct conversion However, a direct conversion UWBreceiver, while attractive for power consumption and simplicity of its local oscillator (LO) scheme [5], [6], has a well-known problem of time-varying DC offset and sensitivity to narrowband A DC offset at the output of the receiver can degrade the SNR of the digitized baseband In addition, it can introduce second-order distortion in the baseband signal, which further degrades the SNR A Low-Cost and Low-Power CMOS Receiver Front-End for MB-OFDM Ultra-Wideband SystemsMahim Ranjan, Member, IEEE, and Lawrence E Larson, Fellow, IEEE0Abstract—This paper presents an RF receiver front-end for MB-OFDM-based ultra-wideband (UWB) The receiver occupies only 35 in a 18 CMOS process and consists of a low-noise amplifier, downconverter and a bandpass There are no on-chip inductors and the receiver requires no off-chip matching The measured receiver gain is 21 dB, noise figure is less than 6 dB, input IIP3 is 6 dBm, and the receiver consumes 5 mA from a 3 V The receivercovers all the MB-OFDM bands from 1 to 8 GHIndex Terms—CMOS, distortion, OFDM, receiver, ultra wideband, UWBI INTRODUCTIONULTRA-WIDEBAND (UWB)multi-band orthogonal frequency-division multiplexing (MB-OFDM) systems have been proposed as an emerging solution to wireless communicationapplications requiring high data rates (up to 480 Mb/s) over short In one proposed version [1], the carrier, with a bandwidth of 528 MHz, can hop to one of 14 channels（2904+528n,n=123…14）, divided into four groups of three channels and one group of two This representative time-frequency interleaving for a Group 1-only systemis depicted in F Design of a receiver for such a systempresents many challenges due to the wide bandwidth of the RF front- However, to assure the widest possible adoption, RF portions of these systems should consume little DC power and die area, and be implemented in a standard CMOS These last requirements argue against the use of on-chip inductors wherever Since theUWBfront-end intrinsically possesses a wide bandwidth, it is open to reception of undesired narrowband signals such as 11 a/b/g and the recently proposedWiMAX [2] systems, as shown in F Although OFDM systems are less susceptible to relatively narrowband jammers, nonlinearities in the receiver can result in jammer cross-modulation with wideband input signals, resulting in reduced signal-to-noise ratio (SNR) and a degradation in system performance [3] In addition, received wideband signals (from other UWB transmitters) can intermodulate and the resulting products can land in a desired Since the system is inherently wideband, harmonic distortion of a single unwanted UWB transmitter can also produce in-band distortion products and reduce the SNR For the system to successfully operate in such a hostile environment, the linearity specifications of the receiver need to include these distortion

中文题目作者11 作者21,2 作者31 作者41,2(单位1 江苏 南京 单位2 辽宁 大连 116023)摘要 （摘要应为独立的小短文,以第三人称撰写,避免使用"本文"、"作者"等词汇。摘要中应介绍实验目的、方法、结果和最终结论（四要素缺一不可），特别注意所述内容均应包含在正文中。在执行上述原则时，在有些情况下，摘要可包括研究工作的主要对象和范围，以及具有情报价值的其它重要的信息。不应有引言中出现的内容，也不要对论文内容作诠释和评论，不得简单重复题名中已有的信息；不用非公知公用的符号和术语，不用引文，除非该论文证实或否定了他人已发表的论文；缩略语、略称、代号,在首次出现时必须加以说明；不用图、表、化学结构。中文摘要需250～300字；）关键词 关键词1；关键词2；关键词3；关键词4 (3～8个)Title in English(与中文题名含义一致，且每一个实词的第1个字母大写)Author11 Author21，2 Author31 Author41，2 (Industrial Chemistry Institute,Nanjing University of Science and Technology,Nanjing 210094,China;Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023,China)Abstract Content of abstract (英文摘要应符合英文语法，句型力求简单, 为了方便国际交流和扩大国际影响,英文摘要应详细撰写,不必与中文摘要一一对应,一般需150～300个实词)Keywords Keyword1; Keyword2; Keyword3; Keyword4 (中、英文关键词一一对应)正文(以5倍行距、宋体(英文用Times New Roman)、小四号字单面打印在A4纸上，稿件还应标注页码以利于编辑和修改。正文各部分都应简洁明了。层次标题一律用阿拉伯数字连续编号；不同层次的数字之间用小圆点相隔，末位数字不加标点符号。如“1”，“1”等)1 一级标题1 二级标题1 三级标题图1 中文图题Figure 1 Figure title in English name1; name2; name3 (图注)第一作者简介：姓名，性别，学历,职称，主要研究方向,联系方式（电话，电子信箱）通讯联系人：姓名，性别，学历,职称，主要研究方向,联系方式（电话，电子信箱）基金项目:国家自然科学基金资助项目(N xxxxxxxx)

The following is a Abstract: the principle of automatic control can make the controlled object in the absence of people directly involved in the case according to predetermined Based on this idea, this design to maximize the realization of the automation system, through the sensor to control the In order to achieve on the basis of free pendulum plate control, based on the free pendulum plate control This paper first analyzes the control panel corner and free pendulum angle relationship, derived the relation, then the control unit, a feedback unit for analysis and comparison is Part of the system control based on STC12C5A60S2 ( MCU ) as the core, from the use of the swing rod sensor collected data to assist SCM stepper motor control ( step motor ) rotation, achieved by a high-precision angle sensor to measure the swing angle of the stepping motor control panel in the periodic oscillation in the corresponding feedback adjustment, and then in the existing device developed on the basis of control software, the equipment debugging, the system precision is analyzed and the practical Key words: single chip microcomputer; free pendulum; flat panel control; angle sensor; stepper motor

有难度呀！！摘要：自动控制原理可以使被控对象在没有人直接参与的情况下按预定的规律运行。基于此思想，本设计最大限度的实现系统的自动化，通过传感器来对系统进行控制。为了实现对基于自由摆的平板的控制,建立基于自由摆的平板控制系统。本文首先分析平板的控制转角与自由摆转角的关系,推导出关系式,再对控制单元、反馈单元进行分析比较给出方案。Abstract:The principle of automatic control is that the controlled object can operate according to the predetermined pattern without direct manual Based on this concept, this design maximizes the realization of the system’s automation through the use of sensors to control the A relevant control system is set up to achieve the control of the free swing Firstly, this paper analyzes the relationship between the controlled rotation angle and the free swing rotation angle to deduce a relational expression, then by analyzing and comparing the control unit and feedback unit, a design scheme is 系统的控制部分以STC12C5A60S2单片机(MCU)为核心，利用从摆杆上的传感器采集的数据来辅助单片机控制步进电机(step motor)的转动，实现由高精度的角度传感器测量出摆动角度后由步进电机控制的平板在周期摆动中做相应反馈调整,然后在现有器件的基础上编制出控制软件,在设备上进行调试,最后对系统的精度进行分析并进行实际测量。STC12C5A60S2 MCU is the core of the system’s controlling parts; it helps the turning of the step motor which is controlled by MCU with the data collected from the sensor on the lever, and after the high precision angle sensor has measured the swing angle, as well as the step motor plate has made corresponding adjustment in the cycle swings, a control software based on the existing device is programmed and debugging is conducted on the equipment; finally an analysis is conducted on the precision of the system and actual measurement is carried 关键词：单片机；自由摆；平板控制；角度传感器；步进电机Key words: MCU; free swing; plate control; angle sensor; step motor 评论补充：如果翻译软件能达到这种顺畅水平，研发者将暴富了！ 【英语牛人团】

答案是是2/3。