RFID技術(shù)是一種新興的自動(dòng)識(shí)別技術(shù),具有信息量大、讀取距離遠(yuǎn)、可同時(shí)讀取多張卡片等特點(diǎn),被廣泛應(yīng)用于門禁、物流、管理等領(lǐng)域. 虛擬儀器是現(xiàn)代計(jì)算機(jī)技術(shù)和儀器技術(shù)深層次結(jié)合的產(chǎn)物.虛擬儀器充分利用了計(jì)算機(jī)的運(yùn)算、存儲(chǔ)、回放顯示及文件管理等智能化功能,同時(shí)把傳統(tǒng)儀器的專業(yè)化功能和面板控件軟件化,使之與計(jì)算機(jī)結(jié)合構(gòu)成一臺(tái)功能完全與傳統(tǒng)硬件儀器相同,同時(shí)又充分享用了計(jì)算機(jī)軟硬件資源的全新虛擬儀器系統(tǒng). Wiegand協(xié)議和ABA協(xié)議作為一種常用的通訊協(xié)議被廣泛的應(yīng)用于RFID讀卡器與上位機(jī)之間的通訊以及RFID讀卡器與控制器之間的通訊.本設(shè)計(jì)的目的是檢測(cè)Wiegand協(xié)議和ABA協(xié)議的數(shù)據(jù)通信是否符合協(xié)議規(guī)定,主要包括脈沖寬度、脈沖間隔等.本設(shè)計(jì)包含F(xiàn)PGA和上位機(jī)軟件兩部分,FPGA上完成對(duì)信號(hào)的采樣和對(duì)采樣數(shù)據(jù)的儲(chǔ)存和緩沖,上位機(jī)完成對(duì)采樣數(shù)據(jù)的處理,以及波形的顯示.FPGA上的設(shè)計(jì)應(yīng)用Verilog語(yǔ)言在Altera公司的Max+PlusII平臺(tái)上進(jìn)行開(kāi)發(fā).上位機(jī)軟件設(shè)計(jì)基于NI公司的圖形化編程軟件LabVIEW.
標(biāo)簽: RFID 讀寫(xiě)器 虛擬檢測(cè)
上傳時(shí)間: 2013-05-20
上傳用戶:1134473521
HT45F43 特性特性特性特性 MCU 特性:內(nèi)建 2x OPAs & 2x Comparators, EEPROM, HIRC 4MHz + 32K LIRC,節(jié)省外部器件 傳感器:電化學(xué) Sensor(ME2-CO) 電源電壓:9V 堿性電池 高音量蜂鳴器輸出:(>85DB) 待機(jī)電流:Typ.21uA, Max.27uA 低電壓檢測(cè):7.5V 自測(cè) / 校準(zhǔn)功能 LED 顯示:紅、黃、綠三顆 LED 指示 使用 HT45F43 內(nèi)建 OSC & Reset 電路,節(jié)省外部器件 使用 HT45F43 內(nèi)建 OPA 進(jìn)行 CO Sensor 信號(hào)放大,節(jié) 省外部器件 WATCHDOG 每 32 秒喚醒一次進(jìn)行 CO 濃度偵測(cè)和電池電壓偵測(cè)
標(biāo)簽: 獨(dú)立 煤氣 報(bào)警 蜂鳴
上傳時(shí)間: 2013-06-16
上傳用戶:qunquan
Actel公司與Mentor Graphics公司日前推出Mentor Graphics的Precision RTL綜合工具最新版本。該版本利用Actel基于閃存的ProASIC Plus家族FPGA產(chǎn)品以提供更高的設(shè)計(jì)性能。
標(biāo)簽: Precision 2005 1100 RTL
上傳時(shí)間: 2013-07-28
上傳用戶:cc111
FEATURES Unique 1-Wire interface requires only one port pin for communication Multidrop capability simplifies distributed temperature sensing applications Requires no external components Can be powered from data line. Power supply range is 3.0V to 5.5V Zero standby power required Measures temperatures from -55°C to +125°C. Fahrenheit equivalent is -67°F to +257°F ±0.5°C accuracy from -10°C to +85°C Thermometer resolution is programmable from 9 to 12 bits Converts 12-bit temperature to digital word in 750 ms (max.) User-definable, nonvolatile temperature alarm settings Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition) Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system
上傳時(shí)間: 2013-08-04
上傳用戶:CHENKAI
·《智能系統(tǒng)的研究與發(fā)展 二十六》(Research and Development in Intelligent Systems XXVI)(Max Barmer & Richard Ellis)文字版[PDF]
標(biāo)簽: nbsp 智能系統(tǒng) 發(fā)展
上傳時(shí)間: 2013-06-21
上傳用戶:宋桃子
MAX3238E/MAX3248E Maxim AutoShutdown Plus 10nA RS-232 30 10nA MAX3237E/MAX3238E/MAX3248E +3.0V +5.5V RS-232
標(biāo)簽: 接口電路 設(shè)計(jì)指南
上傳時(shí)間: 2013-06-02
上傳用戶:ghostparker
《Oracle從入門到精通》從初學(xué)者的角度出發(fā),以通俗易懂的語(yǔ)言,豐富多彩的實(shí)例,詳細(xì)介紹了使用Oracle11g進(jìn)行數(shù)據(jù)管理的各方面技術(shù)。PPT共分為18章,包括Oracle11g概述,Oracle10g體系結(jié)構(gòu),SQL*Plus命令,SQL語(yǔ)言基礎(chǔ),PL/SQL編程,過(guò)程、函數(shù)、觸發(fā)器和包,管理控制文件和日志文件,管理表空間和數(shù)據(jù)文件,數(shù)據(jù)表對(duì)象,其他數(shù)據(jù)對(duì)象,表分區(qū)與索引分區(qū),用戶管理與權(quán)限分配,Oracle系統(tǒng)調(diào)優(yōu),優(yōu)化SQL語(yǔ)句,Oracle數(shù)據(jù)備份與恢復(fù),數(shù)據(jù)導(dǎo)入和導(dǎo)出,Oracle11g的閃回技術(shù),企業(yè)人事管理系統(tǒng)等。
標(biāo)簽: Oracle
上傳時(shí)間: 2013-06-16
上傳用戶:362279997
文中介紹了QPSK調(diào)制解調(diào)的原理,并基于FPGA實(shí)現(xiàn)了QPSK調(diào)制解調(diào)電路。MAX+PLUSII環(huán)境下的仿真結(jié)果表明了該設(shè)計(jì)的正確性。
標(biāo)簽: QPSK 調(diào)制解調(diào)
上傳時(shí)間: 2013-08-07
上傳用戶:digacha
本教程定位于FPGA/CPLD的快速入門。以ALTERA公司的芯片和相應(yīng)的開(kāi)發(fā)軟件為目標(biāo)載體進(jìn)行闡述,本教程闡述了ALTERA主要系列芯片PLD芯片的結(jié)構(gòu)和特點(diǎn)以及相應(yīng)的開(kāi)發(fā)軟件MAX和Plusa和Quartus的使用
上傳時(shí)間: 2013-09-05
上傳用戶:llwap
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.
標(biāo)簽: Converter Defi ADC 轉(zhuǎn)換器
上傳時(shí)間: 2013-11-12
上傳用戶:pans0ul
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