第四章 信號分離電路 第四章 信號分離電路第一節 濾波器的基本知識一、濾波器的功能和類型1、功能:濾波器是具有頻率選擇作用的電路或運算處理系統,具有濾除噪聲和分離各種不同信號的功能。2、類型:按處理信號形式分:模擬濾波器和數字濾波器按功能分:低通、高通、帶通、帶阻按電路組成分:LC無源、RC無源、由特殊元件構成的無源濾波器、RC有源濾波器按傳遞函數的微分方程階數分:一階、二階、高階第一節 濾波器的基本知識 第一節 濾波器的基本知識二、模擬濾波器的傳遞函數與頻率特性(一)模擬濾波器的傳遞函數模擬濾波電路的特性可由傳遞函數來描述。傳遞函數是輸出與輸入信號電壓或電流拉氏變換之比。經分析,任意個互相隔離的線性網絡級聯后,總的傳遞函數等于各網絡傳遞函數的乘積。這樣,任何復雜的濾波網絡,可由若干簡單的一階與二階濾波電路級聯構成。 第一節 濾波器的基本知識(二)模擬濾波器的頻率特性模擬濾波器的傳遞函數H(s)表達了濾波器的輸入與輸出間的傳遞關系。若濾波器的輸入信號Ui是角頻率為w的單位信號,濾波器的輸出Uo(jw)=H(jw)表達了在單位信號輸入情況下的輸出信號隨頻率變化的關系,稱為濾波器的頻率特性函數,簡稱頻率特性。頻率特性H(jw)是一個復函數,其幅值A(w)稱為幅頻特性,其幅角∮(w)表示輸出信號的相位相對于輸入信號相位的變化,稱為相頻特性。
上傳時間: 2014-12-23
上傳用戶:wutong
高速數字系統設計下載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.
上傳時間: 2013-10-26
上傳用戶:縹緲
諸如電信設備、存儲模塊、光學繫統、網絡設備、服務器和基站等許多復雜繫統都采用了 FPGA 和其他需要多個電壓軌的數字 IC,這些電壓軌必須以一個特定的順序進行啟動和停機操作,否則 IC 就會遭到損壞。
上傳時間: 2014-12-24
上傳用戶:packlj
時至今日,以太網供電 (PoE) 技術仍在當今的網絡世界中不斷地普及。由供電設備 (PSE) 提供並傳輸至受電設備 (PD) 輸入端的 12.95W 功率是一種通用電源
上傳時間: 2013-11-06
上傳用戶:xmsmh
介紹了一種反對稱漸變波導微帶探針過渡結構,采用高頻仿真軟件HFSS仿真分析了這個波導微帶過渡結構在 W 頻段的特性,并對影響過渡性能的幾個因素進行了敏感性分析,得出了可供工程應用參考的設計曲線。在全波導帶寬內,實現了插入損耗小于0.088 dB,回波損耗大于27 dB。該結構具有寬頻帶、結構簡單和易加工等優點,可廣泛用于毫米波固態電路系統中。
上傳時間: 2013-11-13
上傳用戶:名爵少年
Abstract: With its small size and large load (10W) capability, the MAX13256 H-bridge transformer driver is an attractive solution forcharging supercapacitors (supercaps). However, a large capacitance on the output of the circuit can force the driver into fault modeat startup, due to the high initial charge current. This application note presents a solution that allows users to charge a largecapacitance without going into fault.
上傳時間: 2013-10-20
上傳用戶:2728460838
符合全球標準的小巧電源•35~150 W容量支持5 V, 12 V和24 V輸出電壓(100 W, 150 W: 僅24 V型)• 支持DIN導軌安裝• 安全標準 : UL 508/60950-1, EN 60950-1CSA C22.2 No. 60950-1
上傳時間: 2014-04-17
上傳用戶:fklinran
鋰離子正極電池材料 1. 目前主要的技術工藝制法: 1.1. 高溫固相反應法:高溫固相反應法是以FeC2O4·2H2O,(NH4)H2PO4,Li2CO3等為原料,按LiFePO4的化學組成配料研磨混合均勻,在惰性氣氛(如Ar,N2)的保護下高溫焙燒反應制得。目前,由于高溫固相反應法存在合成溫度高、粒徑分布大、顆粒粗大等缺點,極大地限制了L iFePO4的電化學性能。 1.2. 溶膠——凝膠合成法:溶膠——凝膠法以三價鐵的醋酸鹽或硝酸鹽為原料,按化學計量加入LiOH后加入檸檬酸,然后再將其加入到H3PO4中,用氨水調節pH,加熱至60℃得到凝膠,加熱使凝膠分解,高溫燒結得到LiFePO4。溶膠——凝膠法的優點是前驅體溶液化學均勻性好,凝膠熱處理溫度低,粉體顆粒粒徑小而且分布窄,粉體燒結性能好,反應過程易于控制,設備簡單;但是在干燥時收縮大,工業化生產難度較大,合成周期較長。
上傳時間: 2013-11-16
上傳用戶:blacklee
Features: High efficiency, high reliability, low cost AC input range selected by switch 100% full load burn-in test Protections: Short circuit / Over load Fixed switching frequency at 25KHz Cooling by free air convection 1 year warranty Dimensions: 199*98*38mm (L*W*H)
標簽: Switchin Output Single SKS
上傳時間: 2013-10-30
上傳用戶:taa123456
Hi3531 H.264編解碼處理器用戶指南
上傳時間: 2014-12-24
上傳用戶:wxhwjf