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  • 無線電干擾 Radio Susceptibility

      Abstract: Engineers often wish that radio susceptibility (RS) or radio immunity could be cured with an antibiotic, a vaccine, or someform of cure-all. Unfortunately, solving the RS problem is not that easy. Indeed, the laws of physics apply. In this article we discusssources of RS. We also offer tips and hints to protect systems, power supplies, printed circuit boards (PCBs), and electroniccomponents from radio frequency interference.

    標(biāo)簽: Susceptibility Radio 無線電干擾

    上傳時(shí)間: 2014-12-30

    上傳用戶:旗魚旗魚

  • 基于塑料光纖的高壓隔離通信接口設(shè)計(jì)

     通過比較各種隔離數(shù)字通信的特點(diǎn)和應(yīng)用范圍,指出塑料光纖在隔離數(shù)字通信中的優(yōu)勢(shì)。使用已經(jīng)標(biāo)準(zhǔn)化的TOSLINK接口,有利于節(jié)省硬件開發(fā)成本和簡(jiǎn)化設(shè)計(jì)難度。給出了塑料光纖的硬件驅(qū)動(dòng)電路,說明設(shè)計(jì)過程中的注意事項(xiàng),對(duì)光收發(fā)模塊的電壓特性和頻率特性進(jìn)行全面試驗(yàn),并給出SPI口使用塑料光纖隔離通信的典型應(yīng)用電路圖。試驗(yàn)結(jié)果表明,該設(shè)計(jì)可為電力現(xiàn)場(chǎng)、電力電子及儀器儀表的設(shè)計(jì)提供參考。 Abstract:  y comparing characteristics and applications area of various isolated digital communications, this article indicates advantages of plastic optical fiber in isolated digital communications. Using the standardized TOSLINK interface, it helps to control costs and difficulty in hardware development and design. Then it gives the hardware driver circuit of plastic optical fiber module, explains the noticed details in design process, gives results on the basis of the optical transceiver module voltage characteristics and frequency characteristics tests. Finally,it gives typical application circuit of the SPI communication port by using plastic optical fiber isolation .The results show that this design can be referenced for the power field, power electronics and instrumentation design.

    標(biāo)簽: 塑料光纖 高壓隔離 通信 接口設(shè)計(jì)

    上傳時(shí)間: 2014-01-10

    上傳用戶:gundan

  • 差分電路中單端及混合模式S-參數(shù)的使用

    Single-Ended and Differential S-Parameters Differential circuits have been important incommunication systems for many years. In the past,differential communication circuits operated at lowfrequencies, where they could be designed andanalyzed using lumped-element models andtechniques. With the frequency of operationincreasing beyond 1GHz, and above 1Gbps fordigital communications, this lumped-elementapproach is no longer valid, because the physicalsize of the circuit approaches the size of awavelength.Distributed models and analysis techniques are nowused instead of lumped-element techniques.Scattering parameters, or S-parameters, have beendeveloped for this purpose [1]. These S-parametersare defined for single-ended networks. S-parameterscan be used to describe differential networks, but astrict definition was not developed until Bockelmanand others addressed this issue [2]. Bockelman’swork also included a study on how to adapt single-ended S-parameters for use with differential circuits[2]. This adaptation, called “mixed-mode S-parameters,” addresses differential and common-mode operation, as well as the conversion betweenthe two modes of operation.This application note will explain the use of single-ended and mixed-mode S-parameters, and the basicconcepts of microwave measurement calibration.

    標(biāo)簽: 差分電路 單端 模式

    上傳時(shí)間: 2014-03-25

    上傳用戶:yyyyyyyyyy

  • S參數(shù)的設(shè)計(jì)與應(yīng)用

    Agilent AN 154 S-Parameter Design Application Note S參數(shù)的設(shè)計(jì)與應(yīng)用 The need for new high-frequency, solid-state circuitdesign techniques has been recognized both by microwaveengineers and circuit designers. These engineersare being asked to design solid state circuitsthat will operate at higher and higher frequencies.The development of microwave transistors andAgilent Technologies’ network analysis instrumentationsystems that permit complete network characterizationin the microwave frequency rangehave greatly assisted these engineers in their work.The Agilent Microwave Division’s lab staff hasdeveloped a high frequency circuit design seminarto assist their counterparts in R&D labs throughoutthe world. This seminar has been presentedin a number of locations in the United States andEurope.From the experience gained in presenting this originalseminar, we have developed a four-part videotape, S-Parameter Design Seminar. While the technologyof high frequency circuit design is everchanging, the concepts upon which this technologyhas been built are relatively invariant.The content of the S-Parameter Design Seminar isas follows:

    標(biāo)簽: S參數(shù)

    上傳時(shí)間: 2013-12-19

    上傳用戶:aa54

  • SMT生產(chǎn)線貼片機(jī)負(fù)荷均衡優(yōu)化

    摘要:采用表面組裝技術(shù)(surface mountt echnology,SMT)進(jìn)行印制板級(jí)電子電路組裝是當(dāng)代組裝技術(shù)發(fā)展的主流。典型的SMT生產(chǎn)線是由高速機(jī)和多功能機(jī)串聯(lián)而成,印制電路板(printed circuit board,PCB)上的元器件在貼片機(jī)之間的負(fù)荷均衡優(yōu)化問題是SMT生產(chǎn)調(diào)度的關(guān)鍵問題。以使貼片時(shí)間與更換吸嘴時(shí)間之和最大的工作臺(tái)生產(chǎn)時(shí)間最小化為目標(biāo)構(gòu)建了負(fù)荷均衡模型,開發(fā)了相應(yīng)的遺傳算法,并進(jìn)行了數(shù)值實(shí)驗(yàn)與算法評(píng)價(jià)。與生產(chǎn)時(shí)間理論下界和現(xiàn)場(chǎng)機(jī)器自帶軟件調(diào)度方案的對(duì)比表明了模型及其算法的有效性。關(guān)鍵詞:印制電路板;表面組裝生產(chǎn)線;負(fù)荷分配;生產(chǎn)線優(yōu)化

    標(biāo)簽: SMT 生產(chǎn)線 均衡 貼片機(jī)

    上傳時(shí)間: 2013-10-09

    上傳用戶:亞亞娟娟123

  • PCB設(shè)計(jì)軟件ExpressPCB 下載

    ExpressPCB 是一款免費(fèi)的PCB設(shè)計(jì)軟件,簡(jiǎn)單實(shí)使??梢援嬰p層板。 Our Free PCB software is a snap to learn and use. For the first time, designing circuit boards is simple for the beginner and efficient for the professional.   Our board manufacturing service makes top quality two and four layer PCBs. Use our MiniBoard service and pay only $51 for three boards (plus $8 shipping).

    標(biāo)簽: ExpressPCB PCB 設(shè)計(jì)軟件

    上傳時(shí)間: 2013-11-15

    上傳用戶:lchjng

  • [電路設(shè)計(jì)套件]NI.Circuit.Design.Suite.11.0_Multisim11.0.漢化.破解

    Multisim11.0

    標(biāo)簽: Multisim Circuit Design Suite

    上傳時(shí)間: 2013-11-18

    上傳用戶:彭玖華

  • PCB設(shè)計(jì)軟件ExpressPCB 下載

    ExpressPCB 是一款免費(fèi)的PCB設(shè)計(jì)軟件,簡(jiǎn)單實(shí)使??梢援嬰p層板。 Our Free PCB software is a snap to learn and use. For the first time, designing circuit boards is simple for the beginner and efficient for the professional.   Our board manufacturing service makes top quality two and four layer PCBs. Use our MiniBoard service and pay only $51 for three boards (plus $8 shipping).

    標(biāo)簽: ExpressPCB PCB 設(shè)計(jì)軟件

    上傳時(shí)間: 2013-10-09

    上傳用戶:1047385479

  • [電路設(shè)計(jì)套件]NI.Circuit.Design.Suite.11.0_Multisim11.0.漢化.破解

    Multisim11.0

    標(biāo)簽: Multisim Circuit Design Suite

    上傳時(shí)間: 2013-10-28

    上傳用戶:不懂夜的黑

  • PCB Design Considerations and Guidelines for 0.4mm and 0.5mm WLPs

    Abstract: Using a wafer-level package (WLP) can reduce the overall size and cost of your solution.However when using a WLP IC, the printed circuit board (PCB) layout can become more complex and, ifnot carefully planned, result in an unreliable design. This article presents some PCB designconsiderations and general recommendations for choosing a 0.4mm- or 0.5mm-pitch WLP for yourapplication.

    標(biāo)簽: Considerations Guidelines and Design

    上傳時(shí)間: 2013-11-09

    上傳用戶:ls530720646

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