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  • 阻抗匹配

    阻抗匹配  阻抗匹配(Impedance matching)是微波電子學里的一部分,主要用于傳輸線上,來達至所有高頻的微波信號皆能傳至負載點的目的,不會有信號反射回來源點,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),另一種則是調整傳輸線的波長(transmission line matching)?! ∫ヅ湟唤M線路,首先把負載點的阻抗值,除以傳輸線的特性阻抗值來歸一化,然后把數值劃在史密夫圖表上?! “央娙莼螂姼信c負載串聯起來,即可增加或減少負載的阻抗值,在圖表上的點會沿著代表實數電阻的圓圈走動。如果把電容或電感接地,首先圖表上的點會以圖中心旋轉180度,然后才沿電阻圈走動,再沿中心旋轉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為零完成匹配?! ∮韶撦d點至來源點加長傳輸線,在圖表上的圓點會沿著圖中心以逆時針方向走動,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整為零,完成匹配.........

    標簽: 阻抗匹配

    上傳時間: 2013-10-20

    上傳用戶:ZOULIN58

  • Transmission Line Ca

    標簽: nbsp Transmission Line Ca

    上傳時間: 2013-11-14

    上傳用戶:defghi010

  • 工業系統安全問題和解決辦法

    Abstract: As industrial control systems (ICSs) have become increasingly connected and use more off-the-shelfcomponents, new vulnerabilities to cyber attacks have emerged. This tutorial looks at three types of ICSs:programmable logic controllers (PLCs), supervisory control and data acquisition (SCADA) systems, anddistributed control systems (DCSs), and then discusses security issues and remedies. This document alsoexplains the benefits and limitations of two cryptographic solutions (digital signatures and encryption) andelaborates on the reasons for using security ICs in an ICS to support cryptography.

    標簽: 工業系統 安全問題

    上傳時間: 2013-10-09

    上傳用戶:woshinimiaoye

  • DN427開關控制器故障保護電壓監測

      Have you had the exasperating experience of a laptop orPDA defi antly not responding to your commands? Youfrantically press key after key, but to no avail. As hopeturns to anger (but just before you throw the company’slaptop through the window) you slam your fi nger againstthe on/off power button. Ten seconds later, your laptopfi nally surrenders and the screen goes black in a highpitched whimper.

    標簽: 427 DN 開關控制器 故障保護

    上傳時間: 2013-12-10

    上傳用戶:Vici

  • LT5514三階互調的精確測量

      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.

    標簽: 5514 LT 三階互調 精確測量

    上傳時間: 2013-11-14

    上傳用戶:l254587896

  • LED升壓器 QX5305 中文資料

    QX5305 是一款高效率,穩定可靠的高亮度LED燈驅動控制IC,內置高精度比較器,off-time控制電路,恒流驅動控制電路等,特別適合大功率,多個高亮度LED燈串恒流驅動。 QX5305采用固定off-time控制工作方式,其工作頻率可高達2.5MHz,可使外部電感和濾波電容、體積減少,效率提高。 在DIM腳加PWM信號,可調節LED燈的亮度。 通過調節外置的電阻,能控制高亮度LED燈的驅動電流,使LED燈亮度達到預期恒定亮度,流過高亮度LED燈的電流可從幾毫安到2安培變化。 方框圖: 管腳排列圖: QX5305的特性 可編程驅動電流,最高可達2A  高效率:最高達95%  寬輸入電壓范圍:2.5V~36V  高工作頻率:2.5MHz  工作頻率可調:500KHz~2.5MHz  驅動LED燈功能強:LED燈串可從1個到幾十個LED高亮度燈 亮度可調:通過EN端PWM,調節LED燈亮度 QX5305應用范圍 干電池供電LED燈串  LED燈杯  RGB大顯屏高亮度LED燈  平板顯示器LED背光燈 恒流充電器控制  通用恒流源。 工作原理簡述: QX5305 采用峰值電流檢測和固定off-time控制方式。片內的R-S觸發器分別由off-time定時器置位和CS比較器、FB比較復位,它控制外部MOSFET管并和功率電感 L、LED、肖特基二極管共同構成一個自振蕩的,連續電感電流模式的升壓型恒流LED驅動電路(參見圖1)。 除了固定off-time控制這點外,QX5305的工作方式和普通的電流模式PWM控制型DC/DC升壓電路非常相似。當工作在連續電流模式下時,流過功率電感的電流IL如圖所示:

    標簽: 5305 LED QX 升壓器

    上傳時間: 2013-10-26

    上傳用戶:TF2015

  • a Java program that reads a file containing instructions written in self-defined file (TPL in this c

    a Java program that reads a file containing instructions written in self-defined file (TPL in this case), and executes those instructions. This program should take the name of the TPL file as a command line parameter, and write its output to the console.

    標簽: file instructions self-defined containing

    上傳時間: 2015-01-11

    上傳用戶:曹云鵬

  • 8051微控制器上的 DES encryption/decryption used in IC smart cards. Software hasn t been validated and lack

    8051微控制器上的 DES encryption/decryption used in IC smart cards. Software hasn t been validated and lacks in-line documentation.

    標簽: encryption decryption validated Software

    上傳時間: 2015-01-13

    上傳用戶:wangdean1101

  • 項目描述: slsnif is a serial port logging utility. It listens to the specified serial port and logs all

    項目描述: slsnif is a serial port logging utility. It listens to the specified serial port and logs all data going through this port in both directions. Serial line sniffer是一個串行端口記錄工具。它監聽指定的串行端口并記錄所有通過這個端口的兩個方向的數據。 來源:http://freshmeat.net slsnif是一個串行端口日志工具。它監聽特殊的串口,記錄所有通過這具串口的兩個方向的數據。 類別: Development Status: 5 - Production/StableEnvironment: Console (Text Based)Intended Audience: DevelopersLicense: GNU General Public License (GPL)Operating System: LinuxProgramming Language: CTopic: Communications, Debuggers

    標簽: serial port specified logging

    上傳時間: 2014-01-17

    上傳用戶:許小華

  • 項目描述: slsnif is a serial port logging utility. It listens to the specified serial port and logs all

    項目描述: slsnif is a serial port logging utility. It listens to the specified serial port and logs all data going through this port in both directions. Serial line sniffer是一個串行端口記錄工具。它監聽指定的串行端口并記錄所有通過這個端口的兩個方向的數據。 來源:http://freshmeat.net slsnif是一個串行端口日志工具。它監聽特殊的串口,記錄所有通過這具串口的兩個方向的數據。 類別: Development Status: 5 - Production/StableEnvironment: Console (Text Based)Intended Audience: DevelopersLicense: GNU General Public License (GPL)Operating System: LinuxProgramming Language: CTopic: Communications, Debuggers

    標簽: serial port specified logging

    上傳時間: 2013-12-12

    上傳用戶:silenthink

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