·《信號(hào)處理引論》【國(guó)外電子與通信教材系列】 【原書(shū)作者】: [美]James H. McClellan/ Ronald W. Schafer/ Mark A. Yoder【譯者】:周利清 等【出版社】 : 電子工業(yè)出版社【出版日期】:2005年4月【文件格式】:超星 本書(shū)是作者根據(jù)他們近十年的教學(xué)和研究
標(biāo)簽: 信號(hào)處理
上傳時(shí)間: 2013-04-24
上傳用戶(hù):shuiyuehen1987
·《嵌入式軟件基礎(chǔ):C語(yǔ)言與匯編的融合》(Fundamentals of Embedded Software)(Daniel W. Lewis)英文版[PDF]
上傳時(shí)間: 2013-07-06
上傳用戶(hù):kernaling
自定義的組件包。其中包含了市場(chǎng)上很炫的優(yōu)秀的用戶(hù)體驗(yàn)組件, 供大家業(yè)務(wù)開(kāi)發(fā)用。
標(biāo)簽: android-w android widget song
上傳時(shí)間: 2013-05-16
上傳用戶(hù):huannan88
ID 型號(hào)廠家用途構(gòu)造溝道v111(V) ixing(A) pdpch(W) waixing 1 2SJ11 東芝DC, LF A, JChop P 20 -10m 100m 4-2 2 2SJ12 東芝DC, LF A,J Chop P 20 -10m 100m 4-2 3 2SJ13 東芝DC, LF A, JChop P 20 -100m 600m 4-35 4 2SJ15 富士通DC, LF A J P 18 -10m 200m 4-1 5 2SJ16 富士通DC, LF A J P 18 -10m 200m 4-1 6 2SJ17 C-MIC J P 20 0.5m 10m 4-47 7 2SJ18 LF PA J(V) P 170 -5 63 4-45 8 2SJ19 NEC LF D J(V) P 140 -100m 800m 4-41 9 2SJ20 NEC LF PA J(V) P 100 -10 100 4-42 10 2SJ22 C-MIC J P 80 0.5m 50m 4-48 11 2SJ39 三菱LF A J P 50 -10m .15/CH 4-81 12 2SJ40 三菱LF A,A-SW J P 50 -10m 300m 4-151 13 2SJ43 松下LF A J P 50 20m 250m 4-80A 14 2SJ44 NEC LF LN A J P 40 -10m 400m 4-53A 15 2SJ45 NEC LF A J P 40 -10m 400m 4-53A 16 2SJ47 日立LF PA MOS P -100 -7 100 4-28A 17 2SJ48 日立LF PA, HS MPOSSW P -120 -7 100 4-28A 18 2SJ49 日立LF PA,HS PMSOWS P -140 -7 100 4-28A 19 2SJ49(H) 日立HS PSW MOS P -140 -7 100 4-28A 20 2SJ50 日立LF/HF PA,HMSO SPSW P -160 -7 100 4-28A 21 2SJ50(H) 日立HS PSW MOS P -160 -7 100 4-28A 22 2SJ51 日立LF LN A J P 40 -10m 800m 4-97A 23 2SJ55 日立LF/HF PA,HMSO SPSW P -180 -8 125 4-28A
標(biāo)簽: MOS 開(kāi)關(guān)管 參數(shù)
上傳時(shí)間: 2013-10-10
上傳用戶(hù):13162218709
第四章 信號(hào)分離電路 第四章 信號(hào)分離電路第一節(jié) 濾波器的基本知識(shí)一、濾波器的功能和類(lèi)型1、功能:濾波器是具有頻率選擇作用的電路或運(yùn)算處理系統(tǒng),具有濾除噪聲和分離各種不同信號(hào)的功能。2、類(lèi)型:按處理信號(hào)形式分:模擬濾波器和數(shù)字濾波器按功能分:低通、高通、帶通、帶阻按電路組成分:LC無(wú)源、RC無(wú)源、由特殊元件構(gòu)成的無(wú)源濾波器、RC有源濾波器按傳遞函數(shù)的微分方程階數(shù)分:一階、二階、高階第一節(jié) 濾波器的基本知識(shí) 第一節(jié) 濾波器的基本知識(shí)二、模擬濾波器的傳遞函數(shù)與頻率特性(一)模擬濾波器的傳遞函數(shù)模擬濾波電路的特性可由傳遞函數(shù)來(lái)描述。傳遞函數(shù)是輸出與輸入信號(hào)電壓或電流拉氏變換之比。經(jīng)分析,任意個(gè)互相隔離的線性網(wǎng)絡(luò)級(jí)聯(lián)后,總的傳遞函數(shù)等于各網(wǎng)絡(luò)傳遞函數(shù)的乘積。這樣,任何復(fù)雜的濾波網(wǎng)絡(luò),可由若干簡(jiǎn)單的一階與二階濾波電路級(jí)聯(lián)構(gòu)成。 第一節(jié) 濾波器的基本知識(shí)(二)模擬濾波器的頻率特性模擬濾波器的傳遞函數(shù)H(s)表達(dá)了濾波器的輸入與輸出間的傳遞關(guān)系。若濾波器的輸入信號(hào)Ui是角頻率為w的單位信號(hào),濾波器的輸出Uo(jw)=H(jw)表達(dá)了在單位信號(hào)輸入情況下的輸出信號(hào)隨頻率變化的關(guān)系,稱(chēng)為濾波器的頻率特性函數(shù),簡(jiǎn)稱(chēng)頻率特性。頻率特性H(jw)是一個(gè)復(fù)函數(shù),其幅值A(chǔ)(w)稱(chēng)為幅頻特性,其幅角∮(w)表示輸出信號(hào)的相位相對(duì)于輸入信號(hào)相位的變化,稱(chēng)為相頻特性。
上傳時(shí)間: 2014-12-23
上傳用戶(hù):wutong
高速數(shù)字系統(tǒng)設(shè)計(jì)下載pdf:High-Speed Digital SystemDesign—A Handbook ofInterconnect Theory and DesignPracticesStephen H. HallGarrett W. HallJames A. McCallA Wiley-Interscience Publication JOHN WILEY & SONS, INC.New York • Chichester • Weinheim • Brisbane • Singapore • TorontoCopyright © 2000 by John Wiley & Sons, Inc.speeddigital systems at the platform level. The book walks the reader through everyrequired concept, from basic transmission line theory to digital timing analysis, high-speedmeasurement techniques, as well as many other topics. In doing so, a unique balancebetween theory and practical applications is achieved that will allow the reader not only tounderstand the nature of the problem, but also provide practical guidance to the solution.The level of theoretical understanding is such that the reader will be equipped to see beyondthe immediate practical application and solve problems not contained within these pages.Much of the information in this book has not been needed in past digital designs but isabsolutely necessary today. Most of the information covered here is not covered in standardcollege curricula, at least not in its focus on digital design, which is arguably one of the mostsignificant industries in electrical engineering.The focus of this book is on the design of robust high-volume, high-speed digital productssuch as computer systems, with particular attention paid to computer busses. However, thetheory presented is applicable to any high-speed digital system. All of the techniquescovered in this book have been applied in industry to actual digital products that have beensuccessfully produced and sold in high volume.Practicing engineers and graduate and undergraduate students who have completed basicelectromagnetic or microwave design classes are equipped to fully comprehend the theorypresented in this book. At a practical level, however, basic circuit theory is all thebackground required to apply the formulas in this book.
標(biāo)簽: 高速數(shù)字 系統(tǒng)設(shè)計(jì)
上傳時(shí)間: 2013-10-26
上傳用戶(hù):縹緲
我司是專(zhuān)業(yè)PCB樣板制造的生產(chǎn)企業(yè)www.syjpcb.com/w 現(xiàn)在我司工程部提供的PCB設(shè)計(jì)規(guī)則要求
標(biāo)簽: PCB 可制造性 設(shè)計(jì)技術(shù)
上傳時(shí)間: 2013-12-17
上傳用戶(hù):fanxiaoqie
針對(duì)模塊電源的發(fā)展趨勢(shì)和有源鉗位電路的工作原理,研究了一種采用磁放大技術(shù)和固定伏特秒控制技術(shù)的有源鉗位正激軟開(kāi)關(guān)電路,并對(duì)該電路的工作過(guò)程進(jìn)行了詳細(xì)的理論分析。在此基礎(chǔ)上,設(shè)計(jì)了一款25 W的電源樣機(jī)。經(jīng)過(guò)測(cè)試,驗(yàn)證了該理論分析的正確性,在整個(gè)負(fù)載范圍內(nèi)完全實(shí)現(xiàn)了主開(kāi)關(guān)管和鉗位開(kāi)關(guān)管的軟開(kāi)關(guān)變換,軟開(kāi)關(guān)實(shí)現(xiàn)的條件不依賴(lài)于變壓器的參數(shù)。在采用肖特基二極管整流的情況下,滿載輸出的轉(zhuǎn)換效率在89%以上。
標(biāo)簽: 有源鉗位 變換器 正 軟開(kāi)關(guān)
上傳時(shí)間: 2013-11-04
上傳用戶(hù):2218870695
為降低大功率開(kāi)關(guān)電源設(shè)計(jì)時(shí)功率器件的選擇、開(kāi)關(guān)頻率和功率密度的提高所面臨的困難,改善單電源供電的可靠性,設(shè)計(jì)并制作程控開(kāi)關(guān)電源并聯(lián)供電系統(tǒng)。系統(tǒng)由2個(gè)額定輸出功率為16 W的8 V DC/DC模塊構(gòu)成的程控開(kāi)關(guān)電源并聯(lián)供電系統(tǒng)。以STM32F103微控制器為核心芯片,通過(guò)程序控制內(nèi)部DAC調(diào)節(jié)PWM主控芯片UC3845的反饋端電壓,使DC/DC模塊輸出電壓產(chǎn)生微小變動(dòng),進(jìn)而可調(diào)整DC/DC模塊的輸出電流并實(shí)時(shí)分配各DC/DC模塊的輸出電流,軟件采用PI算法。試驗(yàn)表明,系統(tǒng)滿載效率高于80.23%,電流分配誤差最大為1.54%;電源輸出在1 s內(nèi)快速達(dá)到穩(wěn)態(tài);系統(tǒng)以4.5 A為閾值實(shí)現(xiàn)過(guò)流保護(hù)和自恢復(fù)功能。
標(biāo)簽: 程控開(kāi)關(guān)電源 并聯(lián)供電系統(tǒng)
上傳時(shí)間: 2013-11-15
上傳用戶(hù):王慶才
為簡(jiǎn)化總線式RS485隔離器的設(shè)計(jì),提出基于脈沖變壓器的總線式RS485隔離器的技術(shù)方案。該方案具有簡(jiǎn)單實(shí)用、無(wú)需電源、無(wú)需考慮數(shù)據(jù)流向、在有限范圍內(nèi)波特率自適應(yīng)、底層用戶(hù)群體易于理解和掌控等特點(diǎn)。給出了基本實(shí)驗(yàn)電路和脈沖變壓器的主要設(shè)計(jì)依據(jù)。基于脈沖變壓器的總線式RS485隔離器,尤其適合工業(yè)環(huán)境下半雙工的A、B兩線制RS485通信網(wǎng)的升級(jí)改造,其基本思想也適用于全雙工的W、X、Y、Z四線制RS485/RS422通信網(wǎng)。
上傳時(shí)間: 2013-10-07
上傳用戶(hù):lizx30340
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