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  • 線性低壓差 (LDO) 穩(wěn)壓器解決方案

    We offer a broad LINE of high performance low dropout (LDO) LINEar regulators with fasttransient response, excellent LINE and load regulation, and very wide input voltage rangefrom 0.9V to 100V. Output currents range from 20mA to 10A, with positive, negative andmultiple output versions available. Many devices offer output voltage operation <0.8V andsome feature operation as low as 0V, even with a single supply. Most are stable with ceramicoutput capacitors. LDO regulators can be applied in virtually any application.

    標(biāo)簽: LDO 線性 低壓差 穩(wěn)壓器

    上傳時(shí)間: 2013-11-15

    上傳用戶:努力努力再努力

  • EPON系統(tǒng)OAM模塊的軟件實(shí)現(xiàn)

    EPON主要由三個(gè)部分構(gòu)成,包括光線路終端(OLlj Optical LINE Terminal)、光分配網(wǎng)絡(luò)(ODN,Optical Distribution Network)和光網(wǎng)絡(luò)單元(ONU,Optical Network Unit .

    標(biāo)簽: EPON OAM 模塊

    上傳時(shí)間: 2013-11-11

    上傳用戶:JGR2013

  • Algorithms(算法概論)pdf

    This book evolved over the past ten years from a set of lecture notes developed while teaching the undergraduate Algorithms course at Berkeley and U.C. San Diego. Our way of teaching this course evolved tremendously over these years in a number of directions, partly to address our students' background (undeveloped formal skills outside of programming), and partly to reect the maturing of the eld in general, as we have come to see it. The notes increasingly crystallized into a narrative, and we progressively structured the course to emphasize the ?story LINE? implicit in the progression of the material. As a result, the topics were carefully selected and clustered. No attempt was made to be encyclopedic, and this freed us to include topics traditionally de-emphasized or omitted from most Algorithms books.

    標(biāo)簽: Algorithms 算法

    上傳時(shí)間: 2013-11-11

    上傳用戶:JamesB

  • Nios II軟件構(gòu)建工具入門

    Nios II軟件構(gòu)建工具入門 The Nios® II Software Build Tools (SBT) allows you to construct a wide variety of complex embedded software systems using a command-LINE interface. From this interface, you can execute Software Built Tools command utilities, and use scripts other tools) to combine the command utilities in many useful ways. This chapter introduces you to project creation with the SBT at the command LINE This chapter includes the following sections: ■ “Advantages of Command-LINE Software Development” ■ “OutLINE of the Nios II SBT Command-LINE Interface” ■ “Getting Started in the SBT Command LINE” ■ “Software Build Tools Scripting Basics” on page 3–8

    標(biāo)簽: Nios 軟件

    上傳時(shí)間: 2013-11-15

    上傳用戶:nanxia

  • allegro cx manual教程

    We would like to welcome you as a user of the Allegro CX, a rugged, handheld fi  eld PC for data collection. Developed with the input of data collection professionals worldwide, the Allegro CX is adaptable and versatile for use in a wide variety of data collection environments. The Allegro CX continues to utilize our ergonomic, lightweight design that is standard in our LINE of Allegro Field PCs. This design makes your Allegro easy to use for extended periods while moving to and from data collection sites in the fi  eld.  

    標(biāo)簽: allegro manual cx 教程

    上傳時(shí)間: 2015-01-02

    上傳用戶:zhangyi99104144

  • pcb layout規(guī)則

    LAYOUT REPORT .............. 1   目錄.................. 1     1. PCB LAYOUT 術(shù)語解釋(TERMS)......... 2     2. Test Point : ATE 測(cè)試點(diǎn)供工廠ICT 測(cè)試治具使用............ 2     3. 基準(zhǔn)點(diǎn) (光學(xué)點(diǎn)) -for SMD:........... 4     4. 標(biāo)記 (LABEL ING)......... 5     5. VIA HOLE PAD................. 5     6. PCB Layer 排列方式...... 5     7.零件佈置注意事項(xiàng) (PLACEMENT NOTES)............... 5     8. PCB LAYOUT 設(shè)計(jì)............ 6     9. Transmission LINE ( 傳輸線 )..... 8     10.General GuideLINEs – 跨Plane.. 8     11. General GuideLINEs – 繞線....... 9     12. General GuideLINEs – Damping Resistor. 10     13. General GuideLINEs - RJ45 to Transformer................. 10     14. Clock Routing GuideLINE........... 12     15. OSC & CRYSTAL GuideLINE........... 12     16. CPU

    標(biāo)簽: layout pcb

    上傳時(shí)間: 2013-10-29

    上傳用戶:1234xhb

  • PCB設(shè)計(jì)問題集錦

    PCB設(shè)計(jì)問題集錦 問:PCB圖中各種字符往往容易疊加在一起,或者相距很近,當(dāng)板子布得很密時(shí),情況更加嚴(yán)重。當(dāng)我用Verify Design進(jìn)行檢查時(shí),會(huì)產(chǎn)生錯(cuò)誤,但這種錯(cuò)誤可以忽略。往往這種錯(cuò)誤很多,有幾百個(gè),將其他更重要的錯(cuò)誤淹沒了,如何使Verify Design會(huì)略掉這種錯(cuò)誤,或者在眾多的錯(cuò)誤中快速找到重要的錯(cuò)誤。    答:可以在顏色顯示中將文字去掉,不顯示后再檢查;并記錄錯(cuò)誤數(shù)目。但一定要檢查是否真正屬于不需要的文字。 問: What’s mean of below warning:(6230,8330 L1) Latium Rule not checked: COMPONENT U26 component rule.答:這是有關(guān)制造方面的一個(gè)檢查,您沒有相關(guān)設(shè)定,所以可以不檢查。 問: 怎樣導(dǎo)出jop文件?答:應(yīng)該是JOB文件吧?低版本的powerPCB與PADS使用JOB文件?,F(xiàn)在只能輸出ASC文件,方法如下STEP:FILE/EXPORT/選擇一個(gè)asc名稱/選擇Select ALL/在Format下選擇合適的版本/在Unit下選Current比較好/點(diǎn)擊OK/完成然后在低版本的powerPCB與PADS產(chǎn)品中Import保存的ASC文件,再保存為JOB文件。 問: 怎樣導(dǎo)入reu文件?答:在ECO與Design 工具盒中都可以進(jìn)行,分別打開ECO與Design 工具盒,點(diǎn)擊右邊第2個(gè)圖標(biāo)就可以。 問: 為什么我在pad stacks中再設(shè)一個(gè)via:1(如附件)和默認(rèn)的standardvi(如附件)在布線時(shí)V選擇1,怎么布線時(shí)按add via不能添加進(jìn)去這是怎么回事,因?yàn)橛袝r(shí)要使用兩種不同的過孔。答:PowerPCB中有多個(gè)VIA時(shí)需要在Design Rule下根據(jù)信號(hào)分別設(shè)置VIA的使用條件,如電源類只能用Standard VIA等等,這樣操作時(shí)就比較方便。詳細(xì)設(shè)置方法在PowerPCB軟件通中有介紹。 問:為什么我把On-LINE DRC設(shè)置為prevent..移動(dòng)元時(shí)就會(huì)彈出(圖2),而你們教程中也是這樣設(shè)置怎么不會(huì)呢?答:首先這不是錯(cuò)誤,出現(xiàn)的原因是在數(shù)據(jù)中沒有BOARD OUTLINE.您可以設(shè)置一個(gè),但是不使用它作為CAM輸出數(shù)據(jù). 問:我用ctrl+c復(fù)制線時(shí)怎設(shè)置原點(diǎn)進(jìn)行復(fù)制,ctrl+v粘帖時(shí)總是以最下面一點(diǎn)和最左邊那一點(diǎn)為原點(diǎn) 答: 復(fù)制布線時(shí)與上面的MOVE MODE設(shè)置沒有任何關(guān)系,需要在右鍵菜單中選擇,這在PowerPCB軟件通教程中有專門介紹. 問:用(圖4)進(jìn)行修改線時(shí)拉起時(shí)怎總是往左邊拉起(圖5),不知有什么辦法可以輕易想拉起左就左,右就右。答: 具體條件不明,請(qǐng)檢查一下您的DESIGN GRID,是否太大了. 問: 好不容易拉起右邊但是用(圖6)修改線怎么改怎么下面都會(huì)有一條不能和在一起,而你教程里都會(huì)好好的(圖8)答:這可能還是與您的GRID 設(shè)置有關(guān),不過沒有問題,您可以將不需要的那段線刪除.最重要的是需要找到布線的感覺,每個(gè)軟件都不相同,所以需要多練習(xí)。 問: 尊敬的老師:您好!這個(gè)圖已經(jīng)畫好了,但我只對(duì)(如圖1)一種的完全間距進(jìn)行檢查,怎么錯(cuò)誤就那么多,不知怎么改進(jìn)。請(qǐng)老師指點(diǎn)。這個(gè)圖在附件中請(qǐng)老師幫看一下,如果還有什么問題請(qǐng)指出來,本人在改進(jìn)。謝?。。。?!答:請(qǐng)注意您的DRC SETUP窗口下的設(shè)置是錯(cuò)誤的,現(xiàn)在選中的SAME NET是對(duì)相同NET進(jìn)行檢查,應(yīng)該選擇NET TO ALL.而不是SAME NET有關(guān)各項(xiàng)參數(shù)的含義請(qǐng)仔細(xì)閱讀第5部教程. 問: U101元件已建好,但元件框的拐角處不知是否正確,請(qǐng)幫忙CHECK 答:元件框等可以通過修改編輯來完成。問: U102和U103元件沒建完全,在自動(dòng)建元件參數(shù)中有幾個(gè)不明白:如:SOIC--》silk screen欄下spacing from pin與outdent from first pin對(duì)應(yīng)U102和U103元件應(yīng)寫什么數(shù)值,還有這兩個(gè)元件SILK怎么自動(dòng)設(shè)置,以及SILK內(nèi)有個(gè)圓圈怎么才能畫得與該元件參數(shù)一致。 答:Spacing from pin指從PIN到SILK的Y方向的距離,outdent from first pin是第一PIN與SILK端點(diǎn)間的距離.請(qǐng)根據(jù)元件資料自己計(jì)算。

    標(biāo)簽: PCB 設(shè)計(jì)問題 集錦

    上傳時(shí)間: 2014-01-03

    上傳用戶:Divine

  • 阻抗匹配

    阻抗匹配  阻抗匹配(Impedance matching)是微波電子學(xué)里的一部分,主要用于傳輸線上,來達(dá)至所有高頻的微波信號(hào)皆能傳至負(fù)載點(diǎn)的目的,不會(huì)有信號(hào)反射回來源點(diǎn),從而提升能源效益?! 〈篌w上,阻抗匹配有兩種,一種是透過改變阻抗力(lumped-circuit matching),另一種則是調(diào)整傳輸線的波長(transmission LINE matching)?! ∫ヅ湟唤M線路,首先把負(fù)載點(diǎn)的阻抗值,除以傳輸線的特性阻抗值來歸一化,然后把數(shù)值劃在史密夫圖表上?! “央娙莼螂姼信c負(fù)載串聯(lián)起來,即可增加或減少負(fù)載的阻抗值,在圖表上的點(diǎn)會(huì)沿著代表實(shí)數(shù)電阻的圓圈走動(dòng)。如果把電容或電感接地,首先圖表上的點(diǎn)會(huì)以圖中心旋轉(zhuǎn)180度,然后才沿電阻圈走動(dòng),再沿中心旋轉(zhuǎn)180度。重覆以上方法直至電阻值變成1,即可直接把阻抗力變?yōu)榱阃瓿善ヅ??! ∮韶?fù)載點(diǎn)至來源點(diǎn)加長傳輸線,在圖表上的圓點(diǎn)會(huì)沿著圖中心以逆時(shí)針方向走動(dòng),直至走到電阻值為1的圓圈上,即可加電容或電感把阻抗力調(diào)整為零,完成匹配.........

    標(biāo)簽: 阻抗匹配

    上傳時(shí)間: 2013-10-20

    上傳用戶:ZOULIN58

  • Transmission LINE Ca

    標(biāo)簽: nbsp Transmission LINE Ca

    上傳時(shí)間: 2013-11-14

    上傳用戶:defghi010

  • LT5514三階互調(diào)的精確測(cè)量

      Accurate measurement of the third order intercept pointfor low distortion IC products such as the LT5514 requirescertain precautions to be observed in the test setup andtesting procedure. The LT5514 LINEarity performance ishigh enough to push the test equipment and test set-up totheir limits. A method for accurate measurement of thirdorder intermodulation products, IM3, with standard testequipment is outLINEd below.It is also important to correctly interpret the LT5514specification with respect to ROUT, and the impact ofdemo-board transmission-LINE termination loss whenevaluating the LINEarity performance, as explained in theLT5514 Datasheet and in Note 1 of this document.

    標(biāo)簽: 5514 LT 三階互調(diào) 精確測(cè)量

    上傳時(shí)間: 2013-11-14

    上傳用戶:l254587896

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