n the first part of this book, we give an introduction to the basic applications of wireless com- munications, as well as the technical problems inherent in this communication paradigm. After a brief history of wireless, Chapter 1 describes the different types of wireless services, and works out their fundamental differences. The subsequent Section 1.3 looks at the same problem from a different angle: what data rates, ranges, etc., occur in practical systems, and especially, what combination of performance measures are demanded (e.g., what data rates need to be transmitted over short distances; what data rates are required over long distances?) Chapter 2 then describes the technical challenges of communicating without wires, putting special emphasis on fading and co-channel interference. Chapter 3 describes the most elementary problem of designing a wireless system, namely to set up a link budget in either a noise-limited or an interference-limited system. After studying this part of the book, the reader should have an overview of different types of wireless services, and understand the technical challenges involved in each of them. The solutions to those challenges are described in the later parts of this book.
标签： Communications Wireless Edition 2nd
上传时间： 2020-06-01
上传用户：shancjb
Electrostatic discharge (ESD) phenomena have been known to mankind since the Greek Empire when Thales of Miletus, one of the Seven Sages of Greece, noticed the attraction of strands of hay to amber, leading to the coining of the word “electron.” Electrical discharge and the guiding of electrical discharge (e.g., lightning) was of interest to Benjamin Franklin in the 1700s, with the invention of the lightning rod. The lightning rod was mankind’s first effort to guide the electrical discharge current of a lightning strike in a direction that would not harm structures.
标签： Circuits Devices 2015 ESD and
上传时间： 2020-06-05
上传用户：shancjb
There exist two essentially different approaches to the study of dynamical systems, based on the following distinction: time-continuous nonlinear differential equations ⇋ time-discrete maps One approach starts from time-continuous differential equations and leads to time-discrete maps, which are obtained from them by a suitable discretization of time. This path is pursued, e.g., in the book by Strogatz [Str94]. 1 The other approach starts from the study of time-discrete maps and then gradually builds up to time-continuous differential equations, see, e.g., [Ott93, All97, Dev89, Has03, Rob95]. After a short motivation in terms of nonlinear differential equations, for the rest of this course we shall follow the latter route to dynamical systems theory. This allows a generally more simple way of introducing the important concepts, which can usually be carried over to a more complex and physically realistic context.
标签： Systems_Rainer Introduction Dynamical Klages to
上传时间： 2020-06-10
上传用户：shancjb
The basic topic of this book is solving problems from system and control theory using convex optimization. We show that a wide variety of problems arising in system and control theory can be reduced to a handful of standard convex and quasiconvex optimization problems that involve matrix inequalities. For a few special cases there are “analytic solutions” to these problems, but our main point is that they can be solved numerically in all cases. These standard problems can be solved in polynomial- time (by, e.g., the ellipsoid algorithm of Shor, Nemirovskii, and Yudin), and so are tractable, at least in a theoretical sense. Recently developed interior-point methods for these standard problems have been found to be extremely efficient in practice. Therefore, we consider the original problems from system and control theory as solved.
标签： Linear_Matrix_Inequalities_in_Sys tem
上传时间： 2020-06-10
上传用户：shancjb
求解lyapunov指数,其中包含c-c算法，g-p算法
标签： lyapunov
上传时间： 2021-01-12
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兴起于上世纪80年代末，并于1990年被IEEE 标准协会接纳为IEEE1149.1标准的JTAG 技术，其产生的背景是对高密度集成电路板进行故障检测，现在已被广泛用于支持芯片测试、设备编程、混合信号测试和现场服务等领域。本文首先介绍了」TAG 接口的定义及其具体结构，对边界扫描的具体工作过程进行了分析，并列举了几种常用功能;在此基础上以M SP430 系列Flash 型单片机为对象探讨了如何实现对具有JTA G接口的Flash芯片的在线编程与调试，并给出了具体实例。
上传时间： 2021-10-29
上传用户：zhaiyawei
常用芯片DIP SOT SOIC QFP电阻电容二极管等3D模型库 3D视图封装库 STEP后缀三维视图（154个）:050-9.STEP0805R.STEP1001-1.STEP1001-2.STEP1001-3.STEP1001-4.STEP1001-5.STEP1001-6.STEP1001-7.STEP1001-8.STEP103_1KV.STEP10X5JT.STEP1206R.STEP13PX2.STEP15PX2.STEP20P插针.STEP25V1000UF.STEP3296W.STEP35V2200UF.STEP3mmLED.STEP3mmLEDH.STEP3X3可调电阻.STEP400V0.1UF.STEP455.STEP630V0.1UF.STEP7805.STEP8P4R.STEPAXIAL-0.2-0.125W.STEPAXIAL-0.4-0.25W.STEPaxial-0.6-2W.STEPB-3528.STEPC-0805.STEPC06x18.STEPCAP-6032.STEPCH3.96 X2.STEPCH3.96-3P.STEPD-PAK.STEPDB25.STEPDC-30.STEPDIP14.STEPDIP16.STEPDIP6.STEPDIP8.STEPDO-214AA.STEPDO-214AB.STEPDO-214AC.STEPDO-41.STEPDO-41Z.STEPFMQ.STEPGNR14D.STEPH9700.STEPILI4981.STEPIN4007.STEPIN5408.STEPJP051-6P6C_02.STEPJQC-3F.STEPJS-1132-10.STEPJS-1132-11.STEPJS-1132-12.STEPJS-1132-13.STEPJS-1132-14.STEPJS-1132-15.STEPJS-1132-2.STEPJS-1132-3.STEPJS-1132-4.STEPJS-1132-5.STEPJS-1132-6.STEPJS-1132-7.STEPJS-1132-8.STEPJS-1132-9.STEPJS-1132R-2.STEPJS-1132R-3.STEPJS-1132R-4.STEPJS-1132R-5.STEPJS-1132R-6.STEPJS-1132R-7.STEPJS-1132R-8.STEPJZC-33F.STEPKBP210.STEPKE2108.STEPKF2510 X8.STEPKF301.STEPKF301x3.STEPKSD-9700.STEPLED5_BLUE.STEPLED5_GRE.STEPLED5_RED.STEPLED5_YEL.STEPLFCSP_WQ.STEPLQFP100.STEPLQFP48.STEPMC-146.STEPmolex-22-27-2021.STEPmolex-22-27-2031.STEPmolex-22-27-2041.STEPmolex-22-27-2051.STEPmolex-22-27-2061.STEPmolex-22-27-2071.STEPmolex-22-27-2081.STEPMSOP10.STEPMSOP8.STEPPA0630NOXOX-HA1.STEPPIN10.STEPPIN24.STEPPIN24A.STEPR 0805.STEPR0402.STEPR0603.STEPR0805.STEPR1206.STEPRA-15.STEPRA-20.STEPRS808.STEPSIP-3-3.96 22-27-2031.STEPSL-B.STEPSL-D.STEPSL-E.STEPSL-G.STEPSL-H.STEPSOD-123.STEPSOD-323.STEPSOD-523.STEPSOD-723.STEPSOD-80.STEPSOIC-8.STEPSOP-4.STEPSOP14.STEPSOP16.STEPSOP18.STEPSOT-89.STEPSOT223.STEPSOT23-3.STEPSOT23-5.STEPSSOP28.STEPTAJ-A.STEPTAJ-B.STEPTAJ-C.STEPTAJ-D.STEPTAJ-E.STEPTAJ-R.STEPTHB6064H.STEPTO-126.STEPTO-126X.STEPTO-220.STEPTO-247.STEPTO-252-3L.STEPTOSHIBA_11-4C1.STEPTSSOP-8.STEPTSSOP14-BOTTON.STEPTSSOP14.STEPTSSOP28.STEPUSB-A.STEPUSB-B.STEPWT.STEP
标签： 芯片 dip sot soic qfp 电阻 电容 二极管 封装
上传时间： 2021-11-21
上传用户：XuVshu
作者：何亮，刘扬论文摘要：氮 化 镓 (G a N )材 料 具 有 优 异 的 物 理 特 性 ，非 常 适 合 于 制 作 高 温 、高 速 和 大 功 率 电 子 器 件 ，具 有 十 分 广 阔 的 市场前景 。 S i衬 底 上 G a N 基 功 率 开 关 器 件 是 目 前 的 主 流 技 术 路 线 ，其 中 结 型 栅 结 构 （p 型 栅 ）和 共 源 共 栅 级 联 结 构 (C asco de)的 常 关 型 器 件 已 经 逐 步 实 现 产 业 化 ，并 在 通 用 电 源 及 光 伏 逆 变 等 领 域 得 到 应 用 。但 是 鉴 于 以 上 两 种 器 件 结 构 存 在 的 缺 点 ，业 界 更 加 期 待 能 更 充 分 发 挥 G a N 性能的 “ 真 ” 常 关 M 0 S F E T 器件。而 GaN M 0 S F E T 器件的全面实用 化 ，仍 然 面 临 着 在 材 料 外 延 方 面 和 器 件 稳 定 性 方 面 的 挑 战 。
上传时间： 2021-12-08
上传用户：XuVshu
摘# 要：设计和制作了一款&& ?G（!& )*）液晶电视用4F9 背光源。模拟出4F9 的光学分布，以此为基础模拟出4F9 阵列的光强和颜色分布，得到适合的背光源厚度尺寸。在实际制作中，采用高效的驱动电路对4F9 阵列进行驱动，利用铝制散热片为背光源提供必须的散热。测试的结果，在整体背光源功耗为"$% M 时，中心亮度达到"D DE% ?6 N G!，均匀度为CO@ " P，色彩还原性达到=QR’ 标准"%! P，远远超过’’S4 背光源的A% P。
上传时间： 2021-12-09
上传用户：
随着物联网无线通信技术的日益发展， WiFi的网络覆盖范围大，移动便捷。传输速度快，安装简单。健康安全等优势。在生活中得到了广泛应用。WiFi模块是将WiFi无线网络协议IEEE802.11.b.g.n协议栈以及TCP/IP协议栈功能集成于模块中，并将多种接口引出。传统的硬件设备嵌入WiFi模块可以直接利用WiFi联入互联网，是实现无线智能家居，WiFi远程控制等物联网用的重要组成部分。 根据WiFi模块引出的接口或集成的功能。WiFi模块也就细分为了串口WiFi模块，SDIOWiFi模块，SPI接口WiFi模块模块，AP模块,路由器WiFi模块,WiFi控制模块等。
上传时间： 2021-12-19
上传用户：shjgzh
