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  • 基于FPGA的光纖光柵解調(diào)系統(tǒng)的研究

     波長信號(hào)的解調(diào)是實(shí)現(xiàn)光纖光柵傳感網(wǎng)絡(luò)的關(guān)鍵,基于現(xiàn)有的光纖光柵傳感器解調(diào)方法,提出一種基于FPGA的雙匹配光纖光柵解調(diào)方法,此系統(tǒng)是一種高速率、高精度、低成本的解調(diào)系統(tǒng),并且通過引入雙匹配光柵有效地克服了雙值問題同時(shí)擴(kuò)大了檢測范圍。分析了光纖光柵的測溫原理并給出了該方案軟硬件設(shè)計(jì),綜合考慮系統(tǒng)的解調(diào)精度和FPGA的處理速度給出了基于拉格朗日的曲線擬合算法。 Abstract:  Sensor is one of the most important application of the fiber grating. Wavelength signal demodulating is the key techniques to carry out fiber grating sensing network, based on several existing methods of fiber grating sensor demodulation inadequate, a two-match fiber grating demodulation method was presented. This system is a high-speed, high precision, low-cost demodulation system. And by introducing a two-match grating effectively overcomes the problem of double value while expands the scope of testing. This paper analyzes the principle of fiber Bragg grating temperature and gives the software and hardware design of the program. Considering the system of demodulation accuracy and processing speed of FPGA,this paper gives the curve fitting algorithm based on Lagrange.

    標(biāo)簽: FPGA 光纖光柵 解調(diào)系統(tǒng)

    上傳時(shí)間: 2014-07-24

    上傳用戶:caiguoqing

  • XAPP806 -決定DDR反饋時(shí)鐘的最佳DCM相移

    This application note describes how to build a system that can be used for determining theoptimal phase shift for a Double Data Rate (DDR) memory feedback clock. In this system, theDDR memory is controlled by a controller that attaches to either the OPB or PLB and is used inan embedded microprocessor application. This reference system also uses a DCM that isconfigured so that the phase of its output clock can be changed while the system is running anda GPIO core that controls that phase shift. The GPIO output is controlled by a softwareapplication that can be run on a PowerPC® 405 or Microblaze™ microprocessor.

    標(biāo)簽: XAPP 806 DDR DCM

    上傳時(shí)間: 2014-11-26

    上傳用戶:erkuizhang

  • 基于FPGA的光纖光柵解調(diào)系統(tǒng)的研究

     波長信號(hào)的解調(diào)是實(shí)現(xiàn)光纖光柵傳感網(wǎng)絡(luò)的關(guān)鍵,基于現(xiàn)有的光纖光柵傳感器解調(diào)方法,提出一種基于FPGA的雙匹配光纖光柵解調(diào)方法,此系統(tǒng)是一種高速率、高精度、低成本的解調(diào)系統(tǒng),并且通過引入雙匹配光柵有效地克服了雙值問題同時(shí)擴(kuò)大了檢測范圍。分析了光纖光柵的測溫原理并給出了該方案軟硬件設(shè)計(jì),綜合考慮系統(tǒng)的解調(diào)精度和FPGA的處理速度給出了基于拉格朗日的曲線擬合算法。 Abstract:  Sensor is one of the most important application of the fiber grating. Wavelength signal demodulating is the key techniques to carry out fiber grating sensing network, based on several existing methods of fiber grating sensor demodulation inadequate, a two-match fiber grating demodulation method was presented. This system is a high-speed, high precision, low-cost demodulation system. And by introducing a two-match grating effectively overcomes the problem of double value while expands the scope of testing. This paper analyzes the principle of fiber Bragg grating temperature and gives the software and hardware design of the program. Considering the system of demodulation accuracy and processing speed of FPGA,this paper gives the curve fitting algorithm based on Lagrange.

    標(biāo)簽: FPGA 光纖光柵 解調(diào)系統(tǒng)

    上傳時(shí)間: 2013-10-10

    上傳用戶:zxc23456789

  • DRAM內(nèi)存模塊的設(shè)計(jì)技術(shù)

    第二部分:DRAM 內(nèi)存模塊的設(shè)計(jì)技術(shù)..............................................................143第一章 SDR 和DDR 內(nèi)存的比較..........................................................................143第二章 內(nèi)存模塊的疊層設(shè)計(jì).............................................................................145第三章 內(nèi)存模塊的時(shí)序要求.............................................................................1493.1 無緩沖(Unbuffered)內(nèi)存模塊的時(shí)序分析.......................................1493.2 帶寄存器(Registered)的內(nèi)存模塊時(shí)序分析...................................154第四章 內(nèi)存模塊信號(hào)設(shè)計(jì).................................................................................1594.1 時(shí)鐘信號(hào)的設(shè)計(jì).......................................................................................1594.2 CS 及CKE 信號(hào)的設(shè)計(jì)..............................................................................1624.3 地址和控制線的設(shè)計(jì)...............................................................................1634.4 數(shù)據(jù)信號(hào)線的設(shè)計(jì)...................................................................................1664.5 電源,參考電壓Vref 及去耦電容.........................................................169第五章 內(nèi)存模塊的功耗計(jì)算.............................................................................172第六章 實(shí)際設(shè)計(jì)案例分析.................................................................................178 目前比較流行的內(nèi)存模塊主要是這三種:SDR,DDR,RAMBUS。其中,RAMBUS內(nèi)存采用阻抗受控制的串行連接技術(shù),在這里我們將不做進(jìn)一步探討,本文所總結(jié)的內(nèi)存設(shè)計(jì)技術(shù)就是針對(duì)SDRAM 而言(包括SDR 和DDR)。現(xiàn)在我們來簡單地比較一下SDR 和DDR,它們都被稱為同步動(dòng)態(tài)內(nèi)存,其核心技術(shù)是一樣的。只是DDR 在某些功能上進(jìn)行了改進(jìn),所以DDR 有時(shí)也被稱為SDRAM II。DDR 的全稱是Double Data Rate,也就是雙倍的數(shù)據(jù)傳輸率,但是其時(shí)鐘頻率沒有增加,只是在時(shí)鐘的上升和下降沿都可以用來進(jìn)行數(shù)據(jù)的讀寫操作。對(duì)于SDR 來說,市面上常見的模塊主要有PC100/PC133/PC166,而相應(yīng)的DDR內(nèi)存則為DDR200(PC1600)/DDR266(PC2100)/DDR333(PC2700)。

    標(biāo)簽: DRAM 內(nèi)存模塊 設(shè)計(jì)技術(shù)

    上傳時(shí)間: 2013-10-18

    上傳用戶:宋桃子

  • MemCheck Driver Memory Tool The MemCheck code is designed to provide Windows NT/2K/XP driver develop

    MemCheck Driver Memory Tool The MemCheck code is designed to provide Windows NT/2K/XP driver developers with a tool to help in the detection of the following memory handling issues: Buffer overrun Buffer corruption Buffer use after buffer release Double buffer releases

    標(biāo)簽: MemCheck designed Windows develop

    上傳時(shí)間: 2014-12-05

    上傳用戶:weiwolkt

  • 偽隨機(jī)數(shù)生成算法

    偽隨機(jī)數(shù)生成算法,很優(yōu)秀,double 0-1

    標(biāo)簽: 偽隨機(jī) 生成算法

    上傳時(shí)間: 2015-01-19

    上傳用戶:yyyyyyyyyy

  • 軟件測試:一個(gè)編譯器測試軟件

    軟件測試:一個(gè)編譯器測試軟件,支持下列C語言運(yùn)算符:+ - * / % ^(乘方) 負(fù) (int) (double) "字符串" [](數(shù)組) > < == >= <= != && ! ++ -- = += -= *= /= %= ^=,支持下列關(guān)鍵字:void int double string if else for while do goto break continue return,支持下列數(shù)據(jù)類型:int double string int[] double[] string[],支持下列系統(tǒng)函數(shù):int max(int,int),double max(double,double),int[] newint(int),double[] newdouble(int),string[] newstring(int),void delete(int[]),void delete(double[]),void delete(string[]),支持任意用戶定義函數(shù),支持函數(shù)重載。不支持全局變量。如果發(fā)現(xiàn)錯(cuò)誤,請告訴我

    標(biāo)簽: 軟件測試 編譯器 測試軟件

    上傳時(shí)間: 2013-12-15

    上傳用戶:sy_jiadeyi

  • 基于LMS的雙向回波削除源碼

    基于LMS的雙向回波削除源碼,不過回波幅度不要大于0.2,否則算法認(rèn)為DOUBLE TALK DETECT。各位可修改此閥值,試試效果

    標(biāo)簽: LMS 回波 源碼

    上傳時(shí)間: 2015-03-09

    上傳用戶:lnnn30

  • 這是一個(gè)支持多位數(shù)運(yùn)算(可以達(dá)到幾百位的長整數(shù))的數(shù)類

    這是一個(gè)支持多位數(shù)運(yùn)算(可以達(dá)到幾百位的長整數(shù))的數(shù)類,名字叫Long,它是從long類發(fā)展過來的,但比原來的long類功能多。Long類可以和原有的double,long等等數(shù)據(jù)類型混合運(yùn)算

    標(biāo)簽: 運(yùn)算 整數(shù)

    上傳時(shí)間: 2013-12-28

    上傳用戶:thinode

  • 浮點(diǎn)數(shù)基本運(yùn)算 浮點(diǎn)數(shù)的基本運(yùn)算主要有四則運(yùn)算、符號(hào)處理、大小比較

    浮點(diǎn)數(shù)基本運(yùn)算 浮點(diǎn)數(shù)的基本運(yùn)算主要有四則運(yùn)算、符號(hào)處理、大小比較,以及浮點(diǎn)數(shù)分柝等。 包含頭文件 "fn.hpp" #include "fn.hpp" 浮點(diǎn)數(shù)基本運(yùn)算 浮點(diǎn)數(shù)的基本運(yùn)算中有加、減、乘、除、取負(fù)、絕對(duì)值、相等比較等。 加減乘除 加、減、乘、除四個(gè)運(yùn)算極為相似,都是需要兩個(gè)參數(shù),結(jié)果當(dāng)然也是浮點(diǎn)數(shù)了。 例子: // 加 減 乘 除 btil::fn::plus<f1, f2>::value // f1+f2 的結(jié)果 btil::fn::minus<f1, f2>::value // f1-f2 的結(jié)果 btil::fn::multiplies<f1, f2>::value // f1*f2 的結(jié)果 btil::fn::divides<f1, f2>::value // f1/f2 的結(jié)果 plus<f1, f2>::value::f_val // f1+f2 的結(jié)果的值 struct one { static const double f_val = 1.0 } // 兩個(gè)浮點(diǎn)數(shù) struct two { static const double f_val = 2.0 } minus<two, plus<divides<one, two>::value, one>::value >::value::f_val == 0.5 取負(fù) 取負(fù)運(yùn)算就是取一個(gè)浮點(diǎn)數(shù)的負(fù)數(shù)。

    標(biāo)簽: 浮點(diǎn)數(shù) 運(yùn)算 四則運(yùn)算 比較

    上傳時(shí)間: 2014-12-06

    上傳用戶:exxxds

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