电脑硬件更新换代快，而主机电源更新较慢，十几年的发展，就是由AT结构变化为ATX电源。
上传时间： 2013-05-18
上传用户：小小小熊
M AT L A B是一个可视化的计算程序，被广泛地使用于从个人计算机到超级计算机范围内 的各种计算机上。 M AT L A B包括命令控制、可编程，有上百个预先定义好的命令和函数。这些函数能通过 用户自定义函数进一步扩展。 M AT L A B有许多强有力的命令。例如， M AT L A B能够用一个单一的命令求解线性系统， 能完成大量的高级矩阵处理。 M AT L A B有强有力的二维、三维图形工具。 M AT L A B能与其他程序一起使用。例如， M AT L A B的图形功能，可以在一个 F O RT R A N 程序中完成可视化计
上传时间： 2013-04-24
上传用户：xinshou123456
This document was developed under the Standard Hardware and Reliability Program (SHARP) TechnologyIndependent RepresentATion of Electronic Products (TIREP) project. It is intended for use by VHSIC HardwareDescription Language (VHDL) design engineers and is offered as guidance for the development of VHDL modelswhich are compliant with the VHDL DATa Item Description (DID DI-EGDS-80811) and which can be providedto manufacturing engineering personnel for the development of production dATa and the subsequent productionof hardware. Most VHDL modeling performed to dATe has been concentrATed AT either the component level orAT the conceptual system level. The assembly and sub-assembly levels have been largely disregarded. Under theSHARP TIREP project, an ATtempt has been made to help close this gap. The TIREP models are based upon lowcomplexity Standard Electronic Modules (SEM) of the formAT A configurATion. Although these modules are quitesimple, it is felt thAT the lessons learned offer guidance which can readily be applied to a wide range of assemblytypes and complexities.
上传时间： 2014-12-23
上传用户：xinhaoshan2016
电位计讯号转换器 AT-PM1-P1-DN-ADL 1．产品说明 AT系列转换器/分配器主要设计使用于一般讯号迴路中之转换与隔离；如 4~20mA、0~10V、热电偶(Type K, J, E, T)、热电阻(Rtd-Pt100Ω)、荷重元、电位计(三線式)、电阻(二線式)及交流电压/电流等讯号，机种齐全。 此款薄型设计的转换器/分配器，除了能提供两组讯号输出（输出间隔离）或24V激发电源供传送器使用外，切换式电源亦提供了安装的便利性。上方并设计了电源、输入及输出指示灯及可插拔式接线端子方便现场施工及工作状态检视。 2.产品特点 可选择带指拨开关切换，六种常规输出信号0-5V/0~10V/1~5V/2~10V/4~20mA/ 0~20mA 可自行切换。 双回路输出完全隔离，可选择不同信号。 设计了电源、输入及输出LED指示灯，方便现场工作状态检视。 规格选择表中可指定选购0.1%精度 17.55mm薄型35mm导轨安装。 依据CE国际标准规范设计。 3.技术规格 用途：信号转换及隔离 过载输入能力：电流：10×额定10秒 第二组输出：可选择 输入范围：P1：0 Ω ~ 50.0 Ω / ~ 2.0 KΩ P2：0 Ω ~ 2.0 KΩ / ~ 100.0 KΩ 精确度: ≦±0.2% of F.S. ≦±0.1% of F.S. 侦测电压：1.6V 输入耗损: 交流电流:≤ 0.1VA; 交流电压:≤ 0.15VA 反应时间: ≤ 250msec (10%~90% of FS) 输出波紋: ≤ ±0.1% of F.S. 满量程校正范围:≤ ±10% of F.S.，2组输出可个别调整 零点校正范围:≤ ±10% of F.S.，2组输出可个别调整 隔离:AC 2.0 KV 输出1与输出2之间 隔离抗阻：DC 500V 100MΩ 工作电源: AC 85~265V/DC 100~300V, 50/60Hz 或 AC/DC 20~56V (选购规格) 消耗功率: DC 4W, AC 6.0VA 工作溫度: 0~60 ºC 工作湿度: 20~95% RH, 无结露 温度系数: ≤ 100PPM/ ºC (0~50 ºC) 储存温度: -10~70 ºC 保护等级: IP 42 振动测试: 1~800 Hz, 3.175 g2/Hz 外观尺寸: 94.0mm x 94.0mm x 17.5mm 外壳材质: ABS防火材料，UL94V0 安装轨道: 35mm DIN導軌 (EN50022) 重量: 250g 安全规范(LVD): IEC 61010 (InstallATion cATegory 3) EMC: EN 55011:2002; EN 61326:2003 EMI: EN 55011:2002; EN 61326:2003 常用规格：AT-PM1-P1-DN-ADL 电位计讯号转换器，一组输出，输入范围：0 Ω ~ 50.0 Ω / ~ 2.0 KΩ，输出一组输出4-20mA，工作电源AC/DC20-56V
上传时间： 2013-11-05
上传用户：feitian920
The LT®6552 is a specialized dual-differencing 75MHzoperATional amplifier ideal for rejecting common modenoise as a video line receiver. The input pairs are designedto operATe with equal but opposite large-signal differencesand provide exceptional high frequency commonmode rejection (CMRR of 65dB AT 10MHz), therebyforming an extremely versATile gain block structure thATminimizes component count in most situATions. The dualinput pairs are free to take on independent common modelevels, while the two voltage differentials are summedinternally to form a net input signal.
上传时间： 2014-12-23
上传用户：13691535575
A fully differential amplifi er is often used to converta single-ended signal to a differential signal, a designwhich requires three signifi cant considerATions: theimpedance of the single-ended source must mATch thesingle-ended impedance of the differential amplifi er,the amplifi er’s inputs must remain within the commonmode voltage limits and the input signal must be levelshifted to a signal thAT is centered AT the desired outputcommon mode voltage.
上传时间： 2013-11-09
上传用户：wweqas
Most circuit designers are familiar with diode dynamiccharacteristics such as charge storage, voltage dependentcapacitance and reverse recovery time. Less commonlyacknowledged and manufacturer specifi ed is diode forwardturn-on time. This parameter describes the timerequired for a diode to turn on and clamp AT its forwardvoltage drop. Historically, this extremely short time, unitsof nanoseconds, has been so small thAT user and vendoralike have essentially ignored it. It is rarely discussed andalmost never specifi ed. Recently, switching regulATor clockrATe and transition time have become faster, making diodeturn-on time a critical issue. Increased clock rATes aremandATed to achieve smaller magnetics size; decreasedtransition times somewhAT aid overall effi ciency but areprincipally needed to minimize IC heAT rise. AT clock speedsbeyond about 1MHz, transition time losses are the primarysource of die heATing.
上传时间： 2013-10-10
上传用户：谁偷了我的麦兜
A complete design for a dATa acquisition card for the IBM PC is detailed in this applicATion note. Additionally, C language code is provided to allow sampling of dATa AT speed of more than 20kHz. The speed limitATion is strictly based on the execution speed of the "C" dATa acquisition loop. A "Turbo" XT can acquire dATa AT speeds greATer than 20kHz. Machines with 80286 and 80386 processors can go faster than 20kHz. The computer thAT was used as a test bed in this applicATion was an XT running AT 4.77MHz and therefore all system timing and acquisition time measurements are based on a 4.77MHz clock speed.
上传时间： 2013-10-29
上传用户：BOBOniu
Portable, bATtery-powered operATion of electronic apparATushas become increasingly desirable. Medical, remotedATa acquisition, power monitoring and other applicATionsare good candidATes for bATtery operATion. In some circumstances,due to space, power or reliability considerATions,it is preferable to operATe the circuitry from a single 1.5Vcell. UnfortunATely, a 1.5V supply eliminATes almost alllinear ICs as design candidATes. In fact, the LM10 opamp-reference and the LT®1017/LT1018 comparATors arethe only IC gain blocks fully specifi ed for 1.5V operATion.Further complicATions are presented by the 600mV dropof silicon transistors and diodes. This limitATion consumesa substantial portion of available supply range, makingcircuit design diffi cult. Additionally, any circuit designedfor 1.5V operATion must function AT end-of-life bATteryvoltage, typically 1.3V. (See Box Section, “Componentsfor 1.5V OperATion.”)
标签： Circuitry OperATion Single 1017
上传时间： 2013-12-20
上传用户：Wwill
ANALOG INPUT BANDWIDTH is a measure of the frequencyAT which the reconstructed output fundamental drops3 dB below its low frequency value for a full scale input. Thetest is performed with fIN equal to 100 kHz plus integer multiplesof fCLK. The input frequency AT which the output is −3dB relATive to the low frequency input signal is the full powerbandwidth.APERTURE JITTER is the variATion in aperture delay fromsample to sample. Aperture jitter shows up as input noise.APERTURE DELAY See Sampling Delay.BOTTOM OFFSET is the difference between the input voltagethAT just causes the output code to transition to the firstcode and the negATive reference voltage. Bottom Offset isdefined as EOB = VZT–VRB, where VZT is the first code transitioninput voltage and VRB is the lower reference voltage.Note thAT this is different from the normal Zero Scale Error.CONVERSION LATENCY See PIPELINE DELAY.CONVERSION TIME is the time required for a completemeasurement by an analog-to-digital converter. Since theConversion Time does not include acquisition time, multiplexerset up time, or other elements of a complete conversioncycle, the conversion time may be less than theThroughput Time.DC COMMON-MODE ERROR is a specificATion which appliesto ADCs with differential inputs. It is the change in theoutput code thAT occurs when the analog voltages on the twoinputs are changed by an equal amount. It is usually expressed in LSBs.
上传时间： 2013-11-12
上传用户：pans0ul
