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
Digital radios have undergone an astonishing evolution in the last century. Born as a set of simple and power-hungry electrical and electromechanical devices for low data rate transmission of telegraph data in the Marconi age, they have transformed, thanks to substantial advances in electronic technology, into a set of small, reliable and sophisticated integrated devices supporting broadband multimedia communications. This, however, would not have been possible unless significant progress had been made in recent decades in the field of signal processing algorithms for baseband and passband signals. In fact, the core of any modern digital radio consists of a set of algorithms running over programmable electronic hardware. This book stems from the research and teaching activities of its co-authors in the field of algorithmic techniques for wireless communications. A huge body of technical literature has accumulated in the last four decades in this area, and an extensive coverage of all its important aspects in a single textbook is impossible. For this reason, we have selected a few important topics and, for ease of reading, organized them into two parts.
标签： communications Algorithmic Techniques Wireless
上传时间： 2020-06-01
上传用户：shancjb
This paper reviews key factors to practical ESD protection design for RF and analog/mixed-signal (AMS) ICs, including general challenges emerging, ESD-RFIC interactions, RF ESD design optimization and prediction, RF ESD design characterization, ESD-RFIC co-design technique, etc. Practical design examples are discussed. It means to provide a systematic and practical design flow for whole-chip ESD protection design optimization and prediction for RF/AMS ICs to ensure 1 st Si design success.
标签： ESD_protection_for_RF_and_AMS_ICs
上传时间： 2020-06-05
上传用户：shancjb
stract With global drivers such as better energy consumption, energy efficiency and reduction of greenhouse gases, co 2 emission reduction has become key in every layer of the value chain. Power Electronics has definitely a role to play in these thrilling challenges. From converters down to compound semiconductors, innovation is leading to breakthrough technologies. Wide BandGap, Power Module Packaging, growth of Electric Vehicle market will game change the overall power electronic industry and supply chain. In this presentation we will review power electronics trends, from technologies to markets.
标签： Electronics Materials Power WBG for
上传时间： 2020-06-07
上传用户：shancjb
Instrukcja programowania trójosiowego sterownika ruchu „przemysłowego wyświetlania ekranugo” V2.0 Model kontrolera : HYCNC-WPRS232-P3 , Wersja oprogramowania : V2.0 , Data : 2020-7-12 Autor : Guilin Hengyuan Technology co., Ltd. ( Pan Lee )
标签： programowania Instrukcja HYCNC-WPRS sterownika 232 PLC ver P3 PL
上传时间： 2021-06-23
上传用户：DawidoCezaro
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
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介绍一种万能模拟信号输入采集电路,可以同时支持电压、电流、热电偶、热电阻等常见的工业类型信号,方便后级电路的测量。该研究成果通过不断优化和完善,已成功应用到了中控仪表的新产品中。The paper introduces a collection circuit of universal signal input. The circuit support voltage, current, thermocouple, thermal resistance and other common industrial type signal. The research results, which has been continuous optimized and improved, has been successfully applied to the new production of Zhejiang Supcon Instrument co., Ltd.
标签： 采集电路
上传时间： 2022-04-21
上传用户：slq1234567890
本文开展的主要工作如下：1，设计实现了可通过蓝牙、语音和Wi-Fi三种方式控制的智能家居电源开关控制器。设计了元器件电路、PCB线路和Android UI界面，可应用于Android手机、平板、蓝牙程式实施进程控制，改变了传统家居布线模式，可免开关布线，也可相容已有线路布局，还可与各种智能家庭系统实现无缝连接。借助热成像实验测试了环境温度对该控制器的影响，并对控制器的性能做了全面的分析和研究。2基于稳定性、安全性、易于扩展及便于施工的原则，规划了整个智能家居终端控制系统的通信协议和组网方式，选用支持OpenWrt系统的哦耶路由器改装成中控智能家庭网关。以co传感器监控报警为例，实验验证了整个系统的可行性。3本文使用蓝牙组网，相对于ZigBee功耗更低。在消费电子领域，蓝牙具有更多优势，也得到了越来越多的青睐。随着蓝牙自组网技术（BLE Mesh）的发布，进一步规范了基于IPv6数据包的交换设备间的蓝牙通信，克服了短距离通信和限制通信拓扑结构的缺陷，可免疫电磁干扰。蓝牙的另一大优势就是可直接与手机连接，必将成为近程通信发展的主要方向。注：本文第三章电源开关控制器是独立开发准备投放市场的产品，后来和蓝牙CSR厂商有合作，其提供了CSR1010蓝牙芯片及开发API，所以在架构整个智能家居终端控制系统时，整个系统内所选用的蓝牙芯片都用的是厂商提供的CSR1010芯片，组建BLE mesh网络。
上传时间： 2022-06-23
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USB-PD快充和Type-C测试方案USB-PD（Power Delivery）是基于USB Type-C的供电标准，最大功率可达100W虽然USB-PD快充越来越热，但行业内并没有针对快充的测试工具，ZLG致远电子正式发布USB-PD测试方案，并提供免费上门测试！1、USB Type-C简介Type-C是USB接口的一种形式，不分正反两面均可插入，支持USB标准的充电、数据传输、视频传输、音频传输、显示输出等功能。支持USB-PD后则可实现高达100W的电源供电。本文涉及的USB-PD就是通过Type-C的“配置通道引脚CC'（图1）进行通讯的。USB-PD物理层使用单线通讯（Type-C配置通道co，为了增强抗干扰能力并均衡直流分量，发送协议数据时，物理层先使用4b/5b编码对数据进行转换，再使用双相标记编码（BMO对数据流进行二次转换，最终将信号输出到CC线上。接收的过程和发送的过程相反，具体过程如图2所示。发送者或接收者通常为 USB PD控制器或微处理器。对USB-PD协议进行分析时，只能通过CC线上传输的信号，其分析过程其实就类似于接收者的行为。
上传时间： 2022-06-24
上传用户：d1997wayne
好吧，电路很简单，可是元件值如何选？射频器件差一点就差很多，是不是一定要用专用的射频元件？做为常温测试来说，普通器件就可以满足，当然，如果要考虑温度、谐波、灵敏度等，电感还是选用高Q的，电容选择coG材质的。看看PA元件如何选，AN435里写得很清楚。不想看原理的可以直接参考其值：按以上参考值出17-19dBm是可以的，但是要满打满的出到20dBm，或者大于20dBm则需要根据板子微调部分元件，在你不知道如果调试时，可以小范围调整一下CM以及天线开关后面的低通滤波器，如果还是不行，那就调电感吧。不想深究的可以跳过本节了，下面是AN435里对于PA匹配的原理性说明，感兴趣的可以继续往下面看，其实Sl4432的硬件手册里说得是很全的，多看手册可以学到很多。Sl4432内部的PA并非传统的A，B，C类放大器，也不是D类，而是E类放大器，其实就是一个开关而已。下图是AN435里一个开关类射频放大器的结构图。这个放大器理解起来很容易，比传统ABC类放大器容易多了。其中Lchoke为上拉电感，与三极管C极的电阻是一样的作用，在S0开关时，会给Cshunt充电，经过co和LO组成的带通滤器器，滤除开关过程中产生的杂波及谐波，再经过Lx就可以得到一个正弦波。这类放大器只是提供一个方波，再通过LC选频。
上传时间： 2022-07-03
上传用户：bluedrops
