用户对宽带无线接入业务、尤其是对于宽带无线化以及移动化的需求日益增加,使无线宽带接入技术WiMAX(World interoperability for MICROwave Access,即全球微波接入互操作性技术)应运而生、迅猛发展,成为这两年业界关注的焦点。除了通常的互联网接入应用外,它还将在提供IPTV和VOIP等宽带业务方面取得成功,它还有可能成为一种先进的4G蜂窝电话技术。WiMAX未来将进入蜂窝电话、笔记本电脑和机顶盒等应用中。 本文在介绍WiMAX传输标准802.16d基础上,详细阐述了WiMAX接收机中信道解调芯片中的自动增益控制(Automatic Gain Control,AGC)部分。首先介绍了自动增益控制系统的基本组成和其主要特性指标,通过对一个步进式AGC的分析,得到AGC模型的输出公式。然后针对WiMAX接收机内AGC系统中的模数转换器以及AGC电路进行介绍和理论分析。本文采用SPW(Signal Processing WorkSystem)模型对AGC电路基本结构的算法分析,并结合仿真结果对AGC电路做了详尽解说并对参数进行了解释说明。 最后给出了基于SPW和FPGA(Field Programmable Gate Array)验证的结果。通过SPW对AGC进行了单独的性能测试,并结合整个系统的性能测试来说明AGC可以和系统的其他模块协同工作。在FPGA测试中,可以证明用Verilog实现后AGC也同样能较好的工作。 本文实现的基于导频的步进式的数字AGC是针对WiMAX系统的自动增益控制电路提出的解决方案。此算法结合WiMAX系统的传输方式,提出的算法具有迅速锁定信号的特点,能够满足WiMAX系统的要求。同时,由于各种关键参数设计为寄存器可配的方式,具有很好的灵活性,也就具有了更高的移植性,可以作为一种通用的数字AGC算法。
上传时间： 2013-04-24
上传用户：zhanditian
电子工业出版社，MICROwave Engineering(Third Edition)中文版，(美)David M.Pozar著。微波工程经典教材，内容有：电磁理论、传输线理论、传输线和波导、微波网络分析、阻抗匹配和调谐、微波谐振器、功率分配器和定向耦合器、微波滤波器、铁氧体元件的理论与设计、噪声与有源射频元件、微波放大器设计、振荡器和混频器、微波系统导论。第1-308页。
上传时间： 2013-07-18
上传用户：jyycc
电子工业出版社，MICROwave Engineering(Third Edition)中文版，(美)David M.Pozar著。微波工程经典教材，内容有：电磁理论、传输线理论、传输线和波导、微波网络分析、阻抗匹配和调谐、微波谐振器、功率分配器和定向耦合器、微波滤波器、铁氧体元件的理论与设计、噪声与有源射频元件、微波放大器设计、振荡器和混频器、微波系统导论。第309-617页(完)。
上传时间： 2013-05-28
上传用户：iswlkje
高速数字系统设计下载pdf:High-Speed Digital SystemDesign—A Handbook ofInterconnect Theory and DesignPracticesStephen H. HallGarrett W. HallJames A. McCallA Wiley-Interscience Publication JOHN WILEY & SONS, INC.New York • Chichester • Weinheim • Brisbane • Singapore • TorontoCopyright © 2000 by John Wiley & Sons, Inc.speeddigital systems at the platform level. The book walks the reader through everyrequired concept, from basic transmission line theory to digital timing analysis, high-speedmeasurement techniques, as well as many other topics. In doing so, a unique balancebetween theory and practical applications is achieved that will allow the reader not only tounderstand the nature of the problem, but also provide practical guidance to the solution.The level of theoretical understanding is such that the reader will be equipped to see beyondthe immediate practical application and solve problems not contained within these pages.Much of the information in this book has not been needed in past digital designs but isabsolutely necessary today. Most of the information covered here is not covered in standardcollege curricula, at least not in its focus on digital design, which is arguably one of the mostsignificant industries in electrical engineering.The focus of this book is on the design of robust high-volume, high-speed digital productssuch as computer systems, with particular attention paid to computer busses. However, thetheory presented is applicable to any high-speed digital system. All of the techniquescovered in this book have been applied in industry to actual digital products that have beensuccessfully produced and sold in high volume.Practicing engineers and graduate and undergraduate students who have completed basicelectromagnetic or MICROwave design classes are equipped to fully comprehend the theorypresented in this book. At a practical level, however, basic circuit theory is all thebackground required to apply the formulas in this book.
上传时间： 2013-10-26
上传用户：缥缈
Radio Frequency Integrated Circuit Design I enjoyed reading this book for a number of reasons. One reason is that itaddresses high-speed analog design in the context of MICROwave issues. This isan advanced-level book, which should follow courses in basic circuits andtransmission lines. Most analog integrated circuit designers in the past workedon applications at low enough frequency that MICROwave issues did not arise.As a consequence, they were adept at lumped parameter circuits and often notcomfortable with circuits where waves travel in space. However, in order todesign radio frequency (RF) communications integrated circuits (IC) in thegigahertz range, one must deal with transmission lines at chip interfaces andwhere interconnections on chip are far apart. Also, impedance matching isaddressed, which is a topic that arises most often in MICROwave circuits. In mycareer, there has been a gap in comprehension between analog low-frequencydesigners and MICROwave designers. Often, similar issues were dealt with in twodifferent languages. Although this book is more firmly based in lumped-elementanalog circuit design, it is nice to see that MICROwave knowledge is brought inwhere necessary.Too many analog circuit books in the past have concentrated first on thecircuit side rather than on basic theory behind their application in communications.The circuits usually used have evolved through experience, without asatisfying intellectual theme in describing them. Why a given circuit works bestcan be subtle, and often these circuits are chosen only through experience. Forthis reason, I am happy that the book begins first with topics that require anintellectual approach—noise, linearity and filtering, and technology issues. Iam particularly happy with how linearity is introduced (power series). In therest of the book it is then shown, with specific circuits and numerical examples,how linearity and noise issues arise.
上传时间： 2014-12-23
上传用户：han_zh
Linear Technology offers some of the highest performance RF and signal chain solutions for wireless and cellularinfrastructure. These products support worldwide standards including, LTE, WiMAX, GSM,W-CDMA, TD-SCDMA,CDMA, and CDMA2000. Other wireless systems include broadband MICROwave data links, secure communications,satellite receivers, broadband wireless access, wireless broadcast systems, RFID readers and cable infrastructure
上传时间： 2013-11-04
上传用户：kiklkook
Single-Ended and Differential S-Parameters Differential circuits have been important incommunication systems for many years. In the past,differential communication circuits operated at lowfrequencies, where they could be designed andanalyzed using lumped-element models andtechniques. With the frequency of operationincreasing beyond 1GHz, and above 1Gbps fordigital communications, this lumped-elementapproach is no longer valid, because the physicalsize of the circuit approaches the size of awavelength.Distributed models and analysis techniques are nowused instead of lumped-element techniques.Scattering parameters, or S-parameters, have beendeveloped for this purpose [1]. These S-parametersare defined for single-ended networks. S-parameterscan be used to describe differential networks, but astrict definition was not developed until Bockelmanand others addressed this issue [2]. Bockelman’swork also included a study on how to adapt single-ended S-parameters for use with differential circuits[2]. This adaptation, called “mixed-mode S-parameters,” addresses differential and common-mode operation, as well as the conversion betweenthe two modes of operation.This application note will explain the use of single-ended and mixed-mode S-parameters, and the basicconcepts of MICROwave measurement calibration.
上传时间： 2014-03-25
上传用户：yyyyyyyyyy
Agilent AN 154 S-Parameter Design Application Note S参数的设计与应用 The need for new high-frequency, solid-state circuitdesign techniques has been recognized both by MICROwaveengineers and circuit designers. These engineersare being asked to design solid state circuitsthat will operate at higher and higher frequencies.The development of MICROwave transistors andAgilent Technologies’ network analysis instrumentationsystems that permit complete network characterizationin the MICROwave frequency rangehave greatly assisted these engineers in their work.The Agilent MICROwave Division’s lab staff hasdeveloped a high frequency circuit design seminarto assist their counterparts in R&D labs throughoutthe world. This seminar has been presentedin a number of locations in the United States andEurope.From the experience gained in presenting this originalseminar, we have developed a four-part videotape, S-Parameter Design Seminar. While the technologyof high frequency circuit design is everchanging, the concepts upon which this technologyhas been built are relatively invariant.The content of the S-Parameter Design Seminar isas follows:
标签： S参数
上传时间： 2013-12-19
上传用户：aa54
In this paper, a new family of Cassinian wave-guides is proposed, simulating and calculation are finished with CST MICROwave Studio that based on Finite Integral Technique (FIT), and some results are given. Electromagnetic field mode type of it is TE, electromagnetic field is stronger near neck region, and some resonance frequencies appear. The new Cassinian curve wave-guides will possess higher power than ones of the rectangular and elliptic wave-guides because the height at the position where maximal electric field occurs is smaller.
标签： calculation wave-guides simulating Cassinian
上传时间： 2014-01-18
上传用户：netwolf
微波电路设计，切比雪夫微波低通滤波器的设计，MICROwave Office设计 仿真，带说明书
标签： 微波电路
上传时间： 2017-01-28
上传用户：皇族传媒
