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SMALL

  • 降低EMI和保持高效率D類放大器在便攜式產(chǎn)品中的應(yīng)用

    Abstract: Class D amplifiers are typically very efficient, making them ideal candidates for portable applications that require longbattery life and low thermal dissipation. However, electromagnetic interference (EMI) is an issue that commonly accompanies theClass D switching topology. Active-emissions limiting reduces radiated emissions and enables "filterless" operation, allowingdesigners to create SMALL, efficient portable applications with low EMI.

    標(biāo)簽: EMI D類放大器 保持 便攜式產(chǎn)品

    上傳時(shí)間: 2013-11-23

    上傳用戶:哈哈hah

  • 小面積和大面積光電二極管的低噪聲放大器

      Photodiodes can be broken into two categories: largearea photodiodes with their attendant high capacitance(30pF to 3000pF) and SMALLer area photodiodes withrelatively low capacitance (10pF or less). For optimalsignal-to-noise performance, a transimpedance amplifi erconsisting of an inverting op amp and a feedback resistoris most commonly used to convert the photodiode currentinto voltage. In low noise amplifi er design, large areaphotodiode amplifi ers require more attention to reducingop amp input voltage noise, while SMALL area photodiodeamplifi ers require more attention to reducing op amp inputcurrent noise and parasitic capacitances.

    標(biāo)簽: 光電二極管 低噪聲放大器

    上傳時(shí)間: 2013-10-28

    上傳用戶:hanbeidang

  • 二極管導(dǎo)通開關(guān)穩(wěn)壓器引發(fā)的故障時(shí)間

      Most circuit designers are familiar with diode dynamiccharacteristics such as charge storage, voltage dependentcapacitance and reverse recovery time. Less commonlyacknowledged and manufacturer specifi ed is diode forwardturn-on time. This parameter describes the timerequired for a diode to turn on and clamp at its forwardvoltage drop. Historically, this extremely short time, unitsof nanoseconds, has been so SMALL that user and vendoralike have essentially ignored it. It is rarely discussed andalmost never specifi ed. Recently, switching regulator clockrate and transition time have become faster, making diodeturn-on time a critical issue. Increased clock rates aremandated to achieve SMALLer magnetics size; decreasedtransition times somewhat aid overall effi ciency but areprincipally needed to minimize IC heat rise. At clock speedsbeyond about 1MHz, transition time losses are the primarysource of die heating.

    標(biāo)簽: 二極管 導(dǎo)通 開關(guān)穩(wěn)壓器

    上傳時(shí)間: 2013-10-10

    上傳用戶:誰偷了我的麥兜

  • IC封裝製程簡(jiǎn)介(IC封裝制程簡(jiǎn)介)

    半導(dǎo)體的產(chǎn)品很多,應(yīng)用的場(chǎng)合非常廣泛,圖一是常見的幾種半導(dǎo)體元件外型。半導(dǎo)體元件一般是以接腳形式或外型來劃分類別,圖一中不同類別的英文縮寫名稱原文為   PDID:Plastic Dual Inline Package SOP:SMALL Outline Package SOJ:SMALL Outline J-Lead Package PLCC:Plastic Leaded Chip Carrier QFP:Quad Flat Package PGA:Pin Grid Array BGA:Ball Grid Array         雖然半導(dǎo)體元件的外型種類很多,在電路板上常用的組裝方式有二種,一種是插入電路板的銲孔或腳座,如PDIP、PGA,另一種是貼附在電路板表面的銲墊上,如SOP、SOJ、PLCC、QFP、BGA。    從半導(dǎo)體元件的外觀,只看到從包覆的膠體或陶瓷中伸出的接腳,而半導(dǎo)體元件真正的的核心,是包覆在膠體或陶瓷內(nèi)一片非常小的晶片,透過伸出的接腳與外部做資訊傳輸。圖二是一片EPROM元件,從上方的玻璃窗可看到內(nèi)部的晶片,圖三是以顯微鏡將內(nèi)部的晶片放大,可以看到晶片以多條銲線連接四周的接腳,這些接腳向外延伸並穿出膠體,成為晶片與外界通訊的道路。請(qǐng)注意圖三中有一條銲線從中斷裂,那是使用不當(dāng)引發(fā)過電流而燒毀,致使晶片失去功能,這也是一般晶片遭到損毀而失效的原因之一。   圖四是常見的LED,也就是發(fā)光二極體,其內(nèi)部也是一顆晶片,圖五是以顯微鏡正視LED的頂端,可從透明的膠體中隱約的看到一片方型的晶片及一條金色的銲線,若以LED二支接腳的極性來做分別,晶片是貼附在負(fù)極的腳上,經(jīng)由銲線連接正極的腳。當(dāng)LED通過正向電流時(shí),晶片會(huì)發(fā)光而使LED發(fā)亮,如圖六所示。     半導(dǎo)體元件的製作分成兩段的製造程序,前一段是先製造元件的核心─晶片,稱為晶圓製造;後一段是將晶中片加以封裝成最後產(chǎn)品,稱為IC封裝製程,又可細(xì)分成晶圓切割、黏晶、銲線、封膠、印字、剪切成型等加工步驟,在本章節(jié)中將簡(jiǎn)介這兩段的製造程序。

    標(biāo)簽: 封裝 IC封裝 制程

    上傳時(shí)間: 2014-01-20

    上傳用戶:蒼山觀海

  • 凌力爾特電池管理解決方案

    Linear Technology’s high performance battery management ICsenable long battery life and run time, while providing precision charging control, constantstatus monitoring and stringent battery protection. Our proprietary design techniques seamlesslymanage multiple input sources while providing SMALL solution footprints, faster charging and100% standalone operation. Battery and circuit protection features enable improved thermalperformance and high reliability operation.

    標(biāo)簽: 凌力爾特 電池管理 方案

    上傳時(shí)間: 2013-10-13

    上傳用戶:yyq123456789

  • 可程式盤面型位數(shù)電表

    精確度0.05%滿刻度±1位數(shù)(Accuracy 0.05%F.S.±1digit) 可測(cè)量交直流電流/交直流電壓/電位計(jì)/傳送器/Pt-100/荷重元/電阻等信號(hào)(Measuring DCA/DCV/ACA/ACV/Potentiometer/Transmitter/Pt-100/Load Cell/Resistor/etc……) 顯示范圍0-19999可任意規(guī)劃(Programmable rate 0 to 1999 digit) 小數(shù)點(diǎn)可任意規(guī)劃(Decimal point can be modified) 尺寸小,穩(wěn)定性高(Dimension SMALL & High stability)

    標(biāo)簽: 程式 數(shù)電

    上傳時(shí)間: 2014-01-25

    上傳用戶:RQB123

  • 電阻式溫度隔離雙輸出傳送器

    特點(diǎn)(FEATURES) 精確度0.1%滿刻度(Accuracy 0.1%F.S.) 多種輸入輸出選擇(Wide selection of input/output range) 三線式接線自動(dòng)補(bǔ)償線路阻抗效應(yīng)(3 wire configuration automatically compensate line resistance effects) 寬范圍交直流兩用電源設(shè)計(jì)(Wide input range for auxiliary power) 尺寸小,穩(wěn)定性高(Dimension SMALL & High stability)

    標(biāo)簽: 電阻式 溫度 傳送器 隔離

    上傳時(shí)間: 2013-10-17

    上傳用戶:Huge_Brother

  • 電位計(jì)隔離雙輸出傳送器

    特點(diǎn)(FEATURES) 精確度0.1%滿刻度(Accuracy 0.1%F.S.) 寬輸入范圍200ohm 至 50Kohm(Wide inpuet ranges from 200ohm to 50Kohm) 多種輸入輸出選擇(Wide selection of input/output range) 輸入與輸出1/輸出2絕緣耐壓 2仟伏特/1分鐘(Dielectric strength 2KVac/1min.(input/output1/output2)) 寬范圍交直流兩用電源設(shè)計(jì)(Wide input range for auxiliary power) 尺寸小,穩(wěn)定性高(Dimension SMALL & High stability)

    標(biāo)簽: 電位計(jì) 傳送器 隔離 輸出

    上傳時(shí)間: 2013-10-28

    上傳用戶:sardinescn

  • 直流信號(hào)隔離雙輸出傳送器

    特點(diǎn)(FEATURES) 精確度0.1%滿刻度(Accuracy 0.1%F.S.) 多種輸入輸出選擇(Wide selection of input/output range) 輸入與輸出1/輸出2絕緣耐壓 2仟伏特/1分鐘(Dielectric strength 2KVac/1min.(input/output1/output2)) 寬范圍交直流兩用電源設(shè)計(jì)(Wide input range for auxiliary power) 尺寸小,穩(wěn)定性高(Dimension SMALL & High stability)

    標(biāo)簽: 直流信號(hào) 傳送器 隔離 輸出

    上傳時(shí)間: 2014-12-24

    上傳用戶:qimingxing130

  • 微電腦型頻率隔離雙輸出傳送器

    特點(diǎn)(FEATURES) 精確度0.03%滿刻度(Accuracy 0.03%F.S.) 頻率輸入范圍0.01Hz至80KHz(Input range from 0.01 Hz to 80KHz) 16 BIT 隔離類比輸出(16 bit DAC isolating analog output) 輸入與輸出1/輸出2絕緣耐壓 2仟伏特/1分鐘(Dielectric strength 2KVac/1min.(input/output1/output2)) 寬范圍交直流兩用電源設(shè)計(jì)(Wide input range for auxiliary power) 尺寸小,穩(wěn)定性高(Dimension SMALL & High stability)

    標(biāo)簽: 微電腦 傳送器 頻率 隔離

    上傳時(shí)間: 2013-10-21

    上傳用戶:dljwq

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