EPS WBS OBS PPM ...
標(biāo)簽： 項(xiàng)目管理
上傳時(shí)間： 2017-08-22
上傳用戶(hù)：znzn
Do you have a mobile phone? We think you probably do, one way or another. We would also guess that you might use it for many diff erent things in the course of your everyday life—as a telephone certainly, but also as an address book, as a clock or watch, as a camera, or now as a connection to your computer, email and the internet. Th ere will be a range of people you use it to contact (or not), and various strategies you use to take calls—or send texts, or take photos, or receive emails, or search online (or not, in diff erent situations). Th ere are also likely to be a range of social relation- ships in your life that your mobile phone helps to maintain—or disrupts, or inter- venes in, or makes possible, or complicates, or just plain helps to handle.
標(biāo)簽： Communications Introduction Mobile Media New An to
上傳時(shí)間： 2020-05-30
上傳用戶(hù)：shancjb
This book provides the essential design techniques for radio systems that operate at frequencies of 3 MHz to 100 GHz and which will be employed in the telecommunication service. We may also call these wireless systems, wireless being synonymous with radio, Telecommunications is a vibrant indus- try, particularly on the ‘‘radio side of the house.’’ The major supporter of this upsurge in radio has been the IEEE and its 802 committees. We now devote ? . an entire chapter to wireless LANs WLANs detailed in IEEE 802.11. We also now have subsections on IEEE 802.15, 802.16, 802.20 and the wireless ? . ? metropolitan area network WMAN . WiFi, WiMax,, and UWB ultra wide- . band are described where these comparatively new radio specialties are demonstrating spectacular growth.
標(biāo)簽： Telecommunication Design System Radio for
上傳時(shí)間： 2020-06-01
上傳用戶(hù)：shancjb
Ultra-wideband (UWB) technology enables high data-rate short-range communica- tion, in excess of hundredmegabit-per-secondsand up to multi-gigabit-per-seconds, over a wide spectrum of frequencies, while keeping power consumption at low lev- els. This low power operation results in a less-interfering co-existence with other existed communication technologies (e.g., UNII bands). In addition to carrying a huge amount of data over a distance of up to 230 feet at very low power (less than 0.5mW), the UWB signal has the ability to penetrate through the doors and other obstacles that tend to reflect signals at more limited bandwidths and higher power densities.
標(biāo)簽： Silicon-Based Front-Ends RF
上傳時(shí)間： 2020-06-01
上傳用戶(hù)：shancjb
Recent advances in wireless communication technologies have had a transforma- tive impact on society and have directly contributed to several economic and social aspects of daily life. Increasingly, the untethered exchange of information between devices is becoming a prime requirement for further progress, which is placing an ever greater demand on wireless bandwidth. The ultra wideband (UWB) system marks a major milestone in this progress. Since 2002, when the FCC allowed the unlicensed use of low-power, UWB radio signals in the 3.1–10.6GHz frequency band, there has been significant synergistic advance in this technology at the cir- cuits, architectural and communication systems levels. This technology allows for devices to communicate wirelessly, while coexisting with other users by ensuring that its power density is sufficiently low so that it is perceived as noise to other users.
標(biāo)簽： Circuits Wideband Ultra
上傳時(shí)間： 2020-06-01
上傳用戶(hù)：shancjb
In the two years since this book was first published, ultra wideband (UWB) has advanced and consolidated as a technology, and many more people are aware of the possibilities for this exciting technology. We too have expanded and consolidated materials in this second edition in the hope that ‘Ultra Wideband: Signals and Systems in Communication Engineering’ will continue to prove a useful tool for many students and engineers to come to an understanding of the basic technologies for UWB.
標(biāo)簽： Wideband Signals Systems Ultra and
上傳時(shí)間： 2020-06-01
上傳用戶(hù)：shancjb
In this book we focus on the basic signal processing that underlies current and future ultra wideband systems. By looking at signal processing in this way we hope this text will be useful even as UWB applications mature and change or regulations regarding ultra wideband systems are modified. The current UWB field is extremely dynamic, with new techniques and ideas being presented at every communications and signal-processing conference. The basic signal-processing techniques presented in this text though will not change for some time to come. Thus, we have taken a somewhat theoretical approach, which we believe is longer lasting and more useful to the reader in the long term than an up-to-the-minute summary that is out of date as soon as it is published.
標(biāo)簽： Wideband Signals Systems Ultra 1st
上傳時(shí)間： 2020-06-01
上傳用戶(hù)：shancjb
LTC2756 18位乘法串行輸入電流輸出數(shù)模轉(zhuǎn)換器DAC模塊ALTIUM原理圖+PCB文件，硬件4層板設(shè)計(jì)，大小為66mmx39mm，ALTIUM設(shè)計(jì)的工程文件，包括完整的原理圖和PCB文件，可以做為你的設(shè)計(jì)參考。 原理圖器件列表： Library Component Count : 14 Name Description ---------------------------------------------------------------------------------------------------- AD8397ARDZ Imported Capacitor CAP.,1uF,X74,10V,10%,1206 Header 10X1 2.54 Header, 100mil, 2x1_1Header, 100mil, 2x1, Tin plated, TH Header, 100mil, 3x1 Header, 100mil, 3x1, Tin plated, TH KJDZ-2 快接端子 LT1012 LT1012 LT1360 LT1360 LTC2054_1 LTC2054 LTC2756AIG LTC2756AIG LTC6244 Imported LTC6655 LTC6655 Resistor RES.,1K OHMS,5%,1/16W,0603 SMA-KE CONNECTOR, SHEILDED, END LAUNCH JACK, GOLD PLATED, FOR 0.062 PCB, EDGE MOUNTED
標(biāo)簽： 數(shù)模轉(zhuǎn)換器
上傳時(shí)間： 2021-12-22
上傳用戶(hù)：
因此，您想編寫(xiě)一個(gè)內(nèi)核模塊。您知道C，您已經(jīng)編寫(xiě)了一些可以作為進(jìn)程運(yùn)行的常規(guī)程序，現(xiàn)在您想知道真正的動(dòng)作在哪里，一個(gè)通配指針可以擦掉文件系統(tǒng)，核心轉(zhuǎn)儲(chǔ)意味著重新啟動(dòng)。內(nèi)核模塊到底是什么？模塊是可以根據(jù)需要加載和卸載的代碼段。它們擴(kuò)展了內(nèi)核的功能，而無(wú)需重新引導(dǎo)系統(tǒng)。例如。模塊驅(qū)動(dòng)程序的一種類(lèi)型是設(shè)備驅(qū)動(dòng)程序，它允許內(nèi)核訪問(wèn)沒(méi)有模塊的系統(tǒng)硬件，我們將不得不構(gòu)建單片內(nèi)核并將新功能直接添加到內(nèi)核映像中，除了具有更大的內(nèi)核之外，這還具有缺點(diǎn)每次我們想要新功能時(shí)都要求我們重建并重新啟動(dòng)內(nèi)核的過(guò)程So, you want to write a kernel module. You know C, you, ve written a few normal programs to run as processes, and now you want to get to where the real action is, to where a single wild pointer can wipe out your file system and a core dump means a reboot.What exactly is a kernel module? Modules are pieces of code that can be loaded and unloaded into th upon demand. They extend the functionality of the kernel without the need to reboot the system. For example.one type of module is the device driver, which allows the kernel to access hardware connected to the syste without modules, we would have to build monolithic kernels and add new functionality directly into the em ernel image, Besides having larger kernels
標(biāo)簽： linux
上傳時(shí)間： 2022-03-30
上傳用戶(hù)：
AD5791是一款單通道、20位、無(wú)緩沖電壓輸出DAC，采用最高33V的雙極性電源供電。正基準(zhǔn)電壓輸入范圍為4V至VDD–2.5V，負(fù)基準(zhǔn)電壓輸入范圍為VSS + 2.5 V至0V。相對(duì)精度最大值為±1 LSB，保證工作單調(diào)性，微分非線(xiàn)性(DNL)最大值為±1 LSB。特性分辨率:1ppm積分非線(xiàn)性(INL):1ppm噪聲譜密度:7.5nV/√Hz長(zhǎng)期線(xiàn)性穩(wěn)定性:0.19 LSB溫度漂移:<0.05 ppm/°C建立時(shí)間:1μs毛刺脈沖:1 nV-s工作溫度范圍:-40°C至125°C20引腳TSSOP封裝寬電源電壓范圍:最高達(dá)±16.5V35 MHz施密特觸發(fā)數(shù)字接口1.8 V兼容數(shù)字接口
上傳時(shí)間： 2022-04-28
上傳用戶(hù)：XuVshu
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