le flows through MOS channel while Ih flows across PNP transistor Ih= a/(1-a) le, IE-le+lh=1/(1-a)' le Since IGBT has a long base PNP, a is mainly determined by ar si0 2ar= 1/cosh(1/La), La: ambipolar diff length a-0.5 (typical value)p MOSFET channel current (saturation), le=U"Cox"W(2"Lch)"(Vc-Vth)le THUS, saturated collector current Ic, sat=1/(1-a)"le=-1/(1-a)"UCox"W/(2Lch)"(Vo-Vth)2Also, transconductance gm, gm= 1/(1-a)"u' Cox W/Lch*(Vo-Vth)Turn-On1. Inversion layer is formed when Vge>Vth2. Apply positive collector bias, +Vce3. Electrons flow from N+ emitter to N-drift layer providing the base current for the PNP transistor4. Since J1 is forward blased, hole carriers are injected from the collector (acts as an emitter).5. Injected hole carriers exceed the doping level of N-drift region (conductivity modulation). Turn-Off1. Remove gate bias (discharge gate)2. Cut off electron current (base current, le, of pnp transistor)
標簽： igbt
上傳時間： 2022-06-20
上傳用戶：wangshoupeng199
PrefaceDuring the past years, there has been a quickly rising interest in radio access technologies for providingmobile as well as nomadic and fixed services for voice, video, and data. The difference indesign, implementation, and use between telecom and datacom technologies is also becoming moreblurred. One example is cellular technologies from the telecom world being used for broadband dataand wireless LAN from the datacom world being used for voice-over IP.Today, the most widespread radio access technology for mobile communication is digital cellular,with the number of users passing 5 billion by 2010, which is more than half of the world’s population.It has emerged from early deployments of an expensive voice service for a few car-borne users,to today’s widespread use of mobile-communication devices that provide a range of mobile servicesand often include camera, MP3 player, and PDA functions. With this widespread use and increasinginterest in mobile communication, a continuing evolution ahead is foreseen.This book describes LTE, developed in 3GPP (Third Generation Partnership Project) and providingtrue 4G broadband mobile access, starting from the first version in release 8 and through the continuingevolution to release 10, the latest version of LTE. Release 10, also known as LTE-Advanced,is of particular interest as it is the major technology approved by the ITU as fulfilling the IMTAdvancedrequirements. The description in this book is based on LTE release 10 and THUS provides acomplete description of the LTE-Advanced radio access from the bottom up.Chapter 1 gives the background to LTE and its evolution, looking also at the different standardsbodies and organizations involved in the process of defining 4G. It also gives a discussion of the reasonsand driving forces behind the evolution.Chapters 2–6 provide a deeper insight into some of the technologies that are part of LTE and itsevolution. Because of its generic nature, these chapters can be used as a background not only for LTEas described in this book, but also for readers who want to understand the technology behind othersystems, such as WCDMA/HSPA, WiMAX, and CDMA2000.Chapters 7–17 constitute the main part of the book. As a start, an introductory technical overviewof LTE is given, where the most important technology components are introduced based onthe generic technologies described in previous chapters. The following chapters provide a detaileddescription of the protocol structure, the downlink and uplink transmission schemes, and the associatedmechanisms for scheduling, retransmission and interference handling. Broadcast operation andrelaying are also described. This is followed by a discussion of the spectrum flexibility and the associated
上傳時間： 2022-07-08
上傳用戶：
VIP專區-嵌入式/單片機編程源碼精選合集系列（139）資源包含以下內容：1. NIOS_II.2. 復雜模型機的設計與實現 組成原理的課程設計.3. 北京理工大學嵌入式系統的課件.4. 一個自己寫的簡單員工管理系統.5. 32位嵌入式系統實現.6. i2c總線的CPLD程序.7. mDOC在C語言環境下的驅動開發程序.8. 凱恩帝繼電器版的PCB原文件?？梢杂米鲃P恩帝數控系統輸出信號的連接.9. Dm6455 driver,magbe useful to you!.10. verilog編程的好工具書.11. 頻率計.12. FM3103的英文資料.13. lcd320240驅動程序.14. SLE4442技術手冊.15. 自己編寫的GAL可編程邏輯電路的編譯軟件abel4的windows界面.16. 基于S3C44B0X的嵌入式系統應用開發實例.ppt.17. 天煌公司的THUS-1型嵌入式實驗開發系統I/O接口實驗.18. 語音芯片isd1760代碼.19. 一個GUI編程的例子 一個GUI編程的例子.20. 創博嵌入式工具箱電子畫板代碼.21. 高速示波器。單片機和CPLD實現。靈活方便.22. UART的源文件.23. AC-3的標準代碼.24. 為實現導彈絕緣電阻的自動化快速測試.25. 為實現導彈絕緣電阻的自動化快速測試.26. 基于ARM2131的IIC讀寫CAT1025程序.27. 嵌入式編程c、c++.28. 12864液晶（ks0108控制器）的驅動程序.29. FT232BM設計的USB轉串口原理圖.30. 基于lpc2103的一個控制板.31. 中星微301攝想頭最新驅動.32. 嵌入式系統開發 MRC 522 S50 S70.33. Jz4740_BSP_v1.2,軍正BSP.34. 文件系統轅馬,想要的258031823大幅度反對反對法.35. CAT93C46-5 7-66-86 EEPROM數據手冊.36. uC/OS-II在ARM7上的移植源碼.37. 開發板AT91SAM9260-EK的測試程序.38. FreeRTOSV3.2.0 經典嵌入式操作系統.39. HT1621驅動程序,C語言編寫,MCU為8051系列.40. C51語言內嵌入匯編語句的程序實現.
上傳時間： 2013-05-23
上傳用戶：eeworm
