在對(duì)低噪聲CMOS圖像傳感器的研究中，除需關(guān)注其噪聲外，目前數(shù)字化也是它的一個(gè)重要的研究和設(shè)計(jì)方向，設(shè)計(jì)了一種可用于低噪聲CMOS圖像傳感器的12 bit，10 Msps的流水線型ADC，并基于0.5 ?滋m標(biāo)準(zhǔn)CMOS工藝進(jìn)行了流片。最后，通過在PCB測(cè)試版上用本文設(shè)計(jì)的ADC實(shí)現(xiàn)了模擬輸出的低噪聲CMOS圖像傳感器的模數(shù)轉(zhuǎn)換，并基于自主開發(fā)的成像測(cè)試系統(tǒng)進(jìn)行了成像驗(yàn)證，結(jié)果表明，成像畫面清晰，該ADC可作為低噪聲CMOS圖像傳感器的芯片級(jí)模數(shù)轉(zhuǎn)換器應(yīng)用。
上傳時(shí)間： 2013-11-19
上傳用戶：xz85592677
多遠(yuǎn)程二極管溫度傳感器-Design Considerations for pc thermal management Multiple RDTS (remote diode temperature sensing) provides the most accurate method of sensing an IC’s junction temperature. It overcomes thermal gradient and placement issues encountered when trying to place external sensors. PCB component count decreases when using a device that provides multiple inputs.Better temperature sensing improves product performance and reliability. Disk drive data integrity suffers at elevated temperatures. IBM published an article stating that a 5°C rise in operating temperature causes a 15% increase in the drive’s failure rate. The overall performance of a system can be improved by providing a more accurate temperature measurement of the most critical devices allowing them to run just a few degrees hotter.The LM83 directly senses its own temperature and the temperature of three external PN junctions. One is dedicated to the CPU of choice, the other two go to other parts of your system that need thermal monitoring such as the disk drive or graphics chip. The SMBus-compatible LM83 supports SMBus timeout and logic levels. The LM83 has two interrupt outputs; one for user-programmable limits and WATCHDOG capability (INT), the other is a Critical Temperature Alarm output (T_CRIT_A) for system power supply shutdown.
標(biāo)簽： Considerat Design 遠(yuǎn)程 二極管
上傳時(shí)間： 2014-12-21
上傳用戶：ljd123456
基于ARM11的嵌入式視頻處理終端設(shè)計(jì) 在研究了基于ARMl 1體系結(jié)構(gòu)的Samsung$3C6410處理器的基 礎(chǔ)上，給出了多格式視頻編解碼的使用方法和Windows CE下中斷流 驅(qū)動(dòng)的設(shè)計(jì)方法，為Windows CE操作系統(tǒng)下的圖像采集和視頻處理 的復(fù)雜控制提供了軟件實(shí)現(xiàn)的方法；并以該處理器為核心，加上外部 存儲(chǔ)器和USB攝像頭等接口電路，完成了一個(gè)嵌入式視頻處理終端 核心板的硬件原理圖設(shè)計(jì)和PCB圖的設(shè)計(jì)，并對(duì)視頻處理終端的印 制電路板的電磁兼容進(jìn)行了研究。 首先對(duì)嵌入式系統(tǒng)和視頻處理進(jìn)行了簡(jiǎn)單的介紹，指出了采用 $3C6410處理器設(shè)計(jì)的視頻處理終端具有的優(yōu)勢(shì)。其次，對(duì)$3C6410 多格式視頻編解碼的使用進(jìn)行了仔細(xì)分析，為多格式視頻編解碼軟件 的編寫提供了思路。給出了Windows CE下中斷流驅(qū)動(dòng)程序的設(shè)計(jì)方 法，為主處理器和BIT處理器在Windows CE下中斷流驅(qū)動(dòng)的設(shè)計(jì)提 供了一種較為通用的參考模型。第三，在熟悉了S3C64lO處理器的 體系結(jié)構(gòu)基礎(chǔ)上設(shè)計(jì)出了下列電路原理圖：電源及復(fù)位電路，時(shí)鐘電 路，DDR SDRAM和FLASH存儲(chǔ)器電路，USB接口電路，串口電路， JTAG接口電路，LCD和TSP接口電路。整個(gè)嵌入式視頻處理終端是 一個(gè)可以獨(dú)立工作的可擴(kuò)展系統(tǒng)，該系統(tǒng)主要用于圖像采集和視頻編 解碼功能。另外，分別從濾波和接地等電磁兼容性設(shè)計(jì)手段出發(fā)，對(duì) 這些方法進(jìn)行了理論分析，提出了提高視頻處理終端電磁兼容的措 施。最后，通過編寫簡(jiǎn)單的應(yīng)用程序，視頻處理終端對(duì)圖像進(jìn)行H．264 編碼，可以通過無(wú)線網(wǎng)卡進(jìn)行傳輸編碼后的圖像。測(cè)試結(jié)果表明，視 頻處理終端能夠?qū)崿F(xiàn)視頻圖像的拍攝、壓縮、無(wú)線視頻傳送和視頻監(jiān) 控等功能。
上傳時(shí)間： 2013-11-22
上傳用戶：誰(shuí)偷了我的麥兜
概要2 個(gè)對(duì)稱的600MHz 高性能Blackfin 內(nèi)核328K Bytes 片內(nèi)存儲(chǔ)器每個(gè) Blackfin 內(nèi)核包括:2 個(gè)16 位MAC，2 個(gè)40 位ALU，4 個(gè)8 位視頻ALU，以及1 個(gè)40 位移位器RISC 式寄存器和指令模型，編程簡(jiǎn)單，編譯環(huán)境友好先進(jìn)的調(diào)試、跟蹤和性能監(jiān)視內(nèi)核電壓 0.8V-1.2V，片內(nèi)調(diào)壓器可調(diào)兼容 3.3V 及2.5V I/O256 引腳Mini-BGA 和297 引腳PBGA 兩種封裝外設(shè)兩個(gè)并行輸入/輸出外圍接口單元，支持ITU-R 656 視頻數(shù)據(jù)格式，可與ADI 的模擬前端ADC 無(wú)縫連接2 個(gè)雙通道全雙工同步串行接口，支持8 個(gè)立體聲I2S 通道2 個(gè)16 通道DMA 控制器和1 個(gè)內(nèi)部存儲(chǔ)器DMA 控制器SPI 兼容端口12 個(gè)通用32-bit 定時(shí)/計(jì)數(shù)器，支持PWMSPI 兼容端口支持 IrDA 的UART2 個(gè)“看門狗”定時(shí)器48 個(gè)可編程標(biāo)志引腳1x-63x 倍頻的片內(nèi)PLL
標(biāo)簽： Blackfin 嵌入式 對(duì)稱性 多處理器
上傳時(shí)間： 2013-11-06
上傳用戶：YUANQINHUI
The #1 Step-by-Step Guide to labviewNow Completely Updated for labview 8! Master labview 8 with the industry's friendliest, most intuitive tutorial: labview for Everyone, Third Edition. Top labview experts Jeffrey Travis and Jim Kring teach labview the easy way: through carefully explained, step-by-step examples that give you reusable code for your own projects! This brand-new Third Edition has been fully revamped and expanded to reflect new features and techniques introduced in labview 8. You'll find two new chapters, plus dozens of new topics, including Project Explorer, AutoTool, XML, event-driven programming, error handling, regular expressions, polymorphic VIs, timed structures, advanced reporting, and much more. Certified labview Developer (CLD) candidates will find callouts linking to key objectives on NI's newest exam, making this book a more valuable study tool than ever. Not just what to d why to do it! Use labview to build your own virtual workbench Master labview's foundations: wiring, creating, editing, and debugging VIs; using controls and indicators; working with data structures; and much more Learn the "art" and best practices of effective labview development NEW: Streamline development with labview Express VIs NEW: Acquire data with NI-DAQmx and the labview DAQmx VIs NEW: Discover design patterns for error handling, control structures, state machines, queued messaging, and more NEW: Create sophisticated user interfaces with tree and tab controls, drag and drop, subpanels, and more Whatever your application, whatever your role, whether you've used labview or not, labview for Everyone, Third Edition is the fastest, easiest way to get the results you're after!
標(biāo)簽： Everyone LabVIEW for 英文
上傳時(shí)間： 2013-10-14
上傳用戶：shawvi
Abstract: This article explains the recent trend in heart-rate and fitness monitors to go wireless toeliminate cables to allow free movement, and allow convenient data collection without the need to plug intheir devices. It details a typical wireless system, using the MAX1472 crystal-referenced phase-lockedloop (PLL) VHF/UHF transmitter.
標(biāo)簽： Heart-RateFitness Monitors Wireless Go
上傳時(shí)間： 2013-11-11
上傳用戶：xiaowei314
Abstract: When people want portable music, they usually rely on battery-powered audio devices. With a bit of engineeringblood (or curiosity) running in your veins, it is not difficult to build a wireless Bluetooth® stereo audio system that can becontrolled with any device that has a Bluetooth connection and a music player
標(biāo)簽： 無(wú)線藍(lán)牙 立體聲 音頻系統(tǒng)
上傳時(shí)間： 2013-10-09
上傳用戶：天空說(shuō)我在
為滿足無(wú)線網(wǎng)絡(luò)技術(shù)具有低功耗、節(jié)點(diǎn)體積小、網(wǎng)絡(luò)容量大、網(wǎng)絡(luò)傳輸可靠等技術(shù)要求，設(shè)計(jì)了一種以MSP430單片機(jī)和CC2420射頻收發(fā)器組成的無(wú)線傳感節(jié)點(diǎn)。通過分析其節(jié)點(diǎn)組成，提出了ZigBee技術(shù)中的幾種網(wǎng)絡(luò)拓?fù)湫问剑⒀芯苛薢igBee路由算法。針對(duì)不同的傳輸要求形式選用不同的網(wǎng)絡(luò)拓?fù)湫问娇梢员M大可能地減少系統(tǒng)成本。同時(shí)針對(duì)不同網(wǎng)絡(luò)選用正確的ZigBee路由算法有效地減少了網(wǎng)絡(luò)能量消耗，提高了系統(tǒng)的可靠性。應(yīng)用試驗(yàn)表明，采用ZigBee方式通信可以提高傳輸速率且覆蓋范圍大，與傳統(tǒng)的有線通信方式相比可以節(jié)約40%左右的成本。 Abstract: To improve the proposed technical requirements such as low-ower， small nodes， large capacity and reliable network transmission， wireless sensor nodes based on MSP430 MCU and CC2420 RF transceiver were designed. This paper provided network topology of ZigBee technology by analysing the component of the nodes and researched ZigBee routing algorithm. Aiming at different requirements of transmission mode to choose the different network topologies form can most likely reduce the system cost. And aiming at different network to choose the correct ZigBee routing algorithm can effectively reduced the network energy consumption and improved the reliability of the system. Results show that the communication which used ZigBee mode can improve the transmission rate， cover more area and reduce 40% cost compared with traditional wired communications mode.
標(biāo)簽： ZigBee 無(wú)線傳感網(wǎng)絡(luò) 協(xié)議研究 路由
上傳時(shí)間： 2013-10-09
上傳用戶：robter
針對(duì)UHF讀寫器設(shè)計(jì)中，在符合EPC Gen2標(biāo)準(zhǔn)的情況下，對(duì)標(biāo)簽返回的高速數(shù)據(jù)進(jìn)行正確解碼以達(dá)到正確讀取標(biāo)簽的要求，提出了一種新的在ARM平臺(tái)下采用邊沿捕獲統(tǒng)計(jì)定時(shí)器數(shù)判斷數(shù)據(jù)的方法，并對(duì)FM0編碼進(jìn)行解碼。與傳統(tǒng)的使用定時(shí)器定時(shí)采樣高低電平的FM0解碼方法相比，該解碼方法可以減少定時(shí)器定時(shí)誤差累積的影響；可以將捕獲定時(shí)器數(shù)中斷與數(shù)據(jù)判斷解碼相對(duì)分隔開，使得中斷對(duì)解碼影響很小，實(shí)現(xiàn)捕獲與解碼的同步。通過實(shí)驗(yàn)表明，這種方法提高了解碼的效率，在160 Kb/s的接收速度下，讀取一張標(biāo)簽的時(shí)間約為30次/s。 Abstract: Aiming at the requirement of receiving correctly decoded data from the tag under high-speed communication which complied with EPC Gen2 standard in the design of UHF interrogator， the article introduced a new technology for FM0 decoding which counted the timer counter to judge data by using the edge interval of signal capture based on the ARM7 platform. Compared with the traditional FM0 decoding method which used the timer timed to sample the high and low level， the method could reduce the accumulation of timing error and could relatively separate capture timer interrupt and the data judgment for decoding， so that the disruption effect on the decoding was small and realizd synchronization of capture and decoding. Testing result shows that the method improves the efficiency of decoding， at 160 Kb/s receiving speed， the time of the interrogator to read a tag is about 30 times/s.
標(biāo)簽： UHF FM0 讀寫器 解碼技術(shù)
上傳時(shí)間： 2013-11-10
上傳用戶：liufei
The LTC®3207/LTC3207-1 is a 600mA LED/Camera driverwhich illuminates 12 Universal LEDs (ULEDs) and onecamera fl ash LED. The ULEDs are considered universalbecause they may be individually turned on or off, setin general purpose output (GPO) mode, set to blink at aselected on-time and period, or gradate on and off at aselected gradation rate. This device also has an externalenable (ENU) pin that may be used to blink, gradate, orturn on/off the LEDs without using the I2C bus. This may beuseful if the microprocessor is in sleep or standby mode. Ifused properly, these features may save valuable memoryspace, programming time, and reduce the I2C traffi c.
上傳時(shí)間： 2014-01-04
上傳用戶：LANCE
蟲蟲下載站版權(quán)所有 京ICP備2021023401號(hào)-1
