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)
标签： igbt
上传时间： 2022-06-20
上传用户：wangshoupeng199
无扫描激光雷达测距成像技术和其他测距系统相比具有可对动态物体清晰成像，功耗低，体积小，成本低廉的优点。无论在军事上，还是在民用上都有非常重要的地位，是激光需达的重点研究方向。本论文介绍了四种基于不同原理的无扫描激光雷达方案。其中基于脉冲增益调制法的无扫描激光雷达具有很强的创造性，该方案使用脉冲光源，脉冲光源发出脉冲光照射目标物体，经物体反射后由功能光接收器MCP（Micro Channel Plate）接收，对MCP施加线性增益调制，在MCP输出端形成新的光场，由CCD（Charge Couple Device）接收.CCD输出的图像经图像处理后得到二维图像信息。该方案对背景光干扰不敏感，可成像距离远，具有很大的研究价值。本文设计了一套模拟系统来验证基于脉冲调制法的无扫描激光雷达测距方案的可行性，由于光电倍增管PMr（Photoelectric electron-multiplier tube）在功能上和MCP具有最大的相似性，所以模拟系统中功能光接收器采用光电倍增管。系统由激光驱动模块、PMT驱动模块、时序控制模块、采样接收模块四个部分组成。我们利用自行研制的模拟系统进行了大量的模拟实验，经过对实验结果分析发现该模拟系统的测量距离可达到1千米，测量误差在15米以内，表明了该方案是确实可行的。论文最后对误差来源进行了分析，并对整个项目进行了总结和展望。
上传时间： 2022-06-22
上传用户：slq1234567890
eMMC (Embedded Multi Media Card）是MMC协会订立、主要针对手机或平板电脑等产品的内嵌式存储器标准规格。eMMC在封装中集成了一个控制器，提供标准接口并管理闪存，使得手机厂商就能专注于产品开发的其它部分，并缩短向市场推出产品的时间。MMC的应用是对存储容量有较高要求的消费电子产品。2011年已大量生产的一些热门产品，如Palm Pre、Amazon Kindle II和Flip MinoHD，都采用了eMMC。为了确认这些产品究竟使用了何种存储器，iSuppli利用拆机分析业务对它们进行了拆解，发现eMMC身在其中。附件为介绍EMMC5.1标准的数据手册.
上传时间： 2022-06-27
上传用户：
pcie（PCI-Express）处理层协议中文详解处理层协议（transaction Layer specification）◆TLP概况。◆寻址定位和路由导向。◆i/o，.memory，configuration，message request、completion 详解。◆请求和响应处理机制。◆virtual channel（ve）Mechanism虚拟通道机制。◆data integrity 数据完整性。一.TLP概况处理层（transaction Layer specification）是请求和响应信息形成的基础。包括四种地址空间，三种处理类型，从下图可以看出在transaction Layer中形成的包的基本概括。一类是对io口和memory的读写包（TLPS:transaction Layers packages），另一类是对配置寄存器的读写设置包，还有一类是信息包，描述通信状态，作为事件的信号告知用户。对memory的读写包分为读请求包和响应包、写请求包（不需要存储器的响应包）。而io类型的读写请求都需要返回I/O口的响应包，
标签： pcie
上传时间： 2022-06-30
上传用户：
摘要：本系统以ICL8038集成块为核心器件，制作一种函数信号发生器，制作成本较低。适合学生学习电子技术测量使用。ICL8038是一种具有多种波形输出的精密振荡集成电路，只需要个别的外部元件就能产生从0.001Hz~30KlHz的低失真正弦波、三角波、矩形波等脉冲信号。输出波形的频率和占空比还可以由电流或电阻控制。另外由于该芯片具有调制信号输入端，所以可以用来对低频信号进行频率调制。关键词：函数信号发生器频率调制Abstract：The system ICL8038 integrated block as the core device，producing a kind of function signal generator，producing low cost.Suitable for students to learn the use of electronic technology measurement.ICL8038 is a kind of multi-precision oscillator waveform output integrated circuits，a separate external components only need to be able to generate from the 0.001Hz ~30KHz low-distortion sine wave，triangle wave，square wave pulse signal，etc..Output waveform of the frequency and duty cycle can also be controlled by a currentor resistance.In addition，as the chip has a modulated signal input terminal，it can be used to low-frequency signal is frequency modulation.
上传时间： 2022-07-04
上传用户：zhanglei193
MT2625 DatasheetVersion: 1.2Release date: 31 January 2018NB-IoT transceiver• Compliant with 3GPP R13/R14 NB-IoT standard• Supports DL 200kHz bandwidth/UL single tone and multi-tone• Supported RF bands: B1/B2/B3/B5/B8/B11/B12/B13/B17/B18/B19/B20/B21/B25/B26/B28/B31/B66/B70/B71• Supports PSM and eDRX modeMicrocontroller subsystem• ARM® Cortex®-M4 with FPU and MPU• 14 DMA channels• One RTC timer, one 64-bit and five 32-bit general purpose timers• Development support: SWD, JTAG• Crypto engineo AES 128, 192, 256 bitso DES, 3DESo MD5, SHA-1, 224, 256, 384, 512• True random number generator• JTAG password protection
标签： MT2625
上传时间： 2022-07-04
上传用户：
• VL53L1X OverView• VL53L1X Software Package• Default and FAST mode• Ultra light driver.• VL53L1X GUI• VL53L1X Multi sensor design• STM32 FW: Import, Compile, Run, Debug…• What is Xtalk?• Cover Window and ID design• How about Human and object reflectance at 940 nm ?
上传时间： 2022-07-17
上传用户：bluedrops
Overview The MT7628 router-on-a-chip includes an 802.11n MAC and baseband,a 2.4 GHz radio and FEM,a 575/580MHz MIPS? 24K% CPU core,a 5-port 10/100 fast ethernet switch. The MT7628 includes everything needed to build an AP router from a single chip. The embedded high performance CPU can process advanced applications effortlessly, such as routing, security and VolP. The MT7628 also includes a selection of interfaces to support a variety of applications, such as a USB port for accessing external storage.Features· Embedded MIPS24KEc(575/580 MHz) with 64KBl-Cache and 32 KB D-Cache·2T2R 2.4 GHz with 300 Mbps PHY data rate· Legacy 802.11b/g and HT 802.11n modes·20/40 MHz channel bandwidth· Reverse Data Grant(RDG)· Maximal Ratio Combining(MRC)· Space Time Block Coding(STBC)· MCM 8 Mbytes DDR1 KGD(MT7628KN)
标签： mt7628
上传时间： 2022-07-18
上传用户：
Single-Channel, Serial Input, 4 mA to20 mA, Current Source DAC, HART Connectivity
上传时间： 2022-07-24
上传用户：
The following table covers the main features offered by the MT7628KN and MT7628AN. Overall, the MT7628KN supports the requirements of an entry level AP/router, while the more advanced MT7628AN supports a number of interfaces together with a large maximum RAM capacity.Features· Embedded MIPS24KEc (575/580 MHz) with 64KBl-Cache and 32KB D-Cache·2T2R 2.4GHz with 300 Mbps PHY data rate· Legacy 802.11b/g and HT 802.11n modes·20/40 MHz channel bandwidth· Reverse Data Grant(RDG)· Maximal Ratio Combining(MRC)· Space Time Block Coding(STBC)· MCM 8 Mbytes DDR1 KGD(MT7628KN)·16-bit DDR1/2 up to 128/256 Mbytes(MT7628AN/KN)· SPI/SD-XC/eMMC·x1 USB 2.0 Host,x1 Ple Root Complex·5-port 10/100 FE PHY
标签： mt7628
上传时间： 2022-07-25
上传用户：
