This application note is an overview discussion of theLinear Technology SPICE macromodel library. It assumeslittle if any prior knowledge of this software library or itshistory. However, it does assume familiarity with both theanalog simulation program SPICE (or one of its manyderivatives), and modern day op amps, including bipolar,JFET, and MOSFET amplifier technologies
上傳時間： 2013-11-14
上傳用戶：zhanditian
Abstract: This application note illustrates an intermediate 8V switching power supply for an automotive radio and infotainment system.The design withstands the complete automotive input voltage range (including cold crank and load dump conditions), assuring a stable8V supply for common subsystems such as a CD driver, LCDs, and a radio module in modern infotainment systems. To avoiddisturbance in the AM and FM bands, the switching power supply runs at a fixed frequency of 2MHz, enabling an ideal solution forradio systems.
標簽： 汽車無線電 信息娛樂系統(tǒng) 開關(guān)電源
上傳時間： 2013-11-20
上傳用戶：feitian920
A recent trend in the design of portable devices has beento use ceramic capacitors to filter DC/DC converter inputs.Ceramic capacitors are often chosen because of theirsmall size, low equivalent series resistance (ESR) and highRMS current capability. Also, recently, designers havebeen looking to ceramic capacitors due to shortages oftantalum capacitors.
上傳時間： 2013-11-05
上傳用戶：comer1123
LPC2210是基于一個支持實時仿真和嵌入式跟蹤的16/32位ARM7TDMI-SCPU的微控制器。對代碼規(guī)模有嚴格控制的應(yīng)用可使用16位Thumb模式將代碼規(guī)模降低超過30%，而性能的損失卻很小。由于LPC2210的144腳封裝、極低的功耗、多個32位定時器、8路10位ADC、PWM輸出以及多達9個外部中斷使它們特別適用于工業(yè)控制、醫(yī)療系統(tǒng)、訪問控制和POS機。通過配置總線，LPC2210最多可提供76個GPIO。由于內(nèi)置了寬范圍的串行通信接口，它們也非常適合于通信網(wǎng)關(guān)、協(xié)議轉(zhuǎn)換器、嵌入式軟modern以及其它各種類型的應(yīng)用。
上傳時間： 2013-11-13
上傳用戶：gut1234567
Design techniques for electronic systems areconstantly changing. In industries at the heart of thedigital revolution, this change is especially acute.Functional integration, dramatic increases incomplexity, new standards and protocols, costconstraints, and increased time-to-market pressureshave bolstered both the design challenges and theopportunities to develop modern electronic systems.One trend driving these changes is the increasedintegration of core logic with previously discretefunctions to achieve higher performance and morecompact board designs.
上傳時間： 2014-12-28
上傳用戶：康郎
在現(xiàn)代通信系統(tǒng)中，電話語音的頻帶被限制在300 Hz～4 kHz的范圍內(nèi)，帶來了語音可懂度和自然度的降低。為了在不增加額外成本的前提下提高語音的可懂度和自然度，進行了電話語音頻帶擴展的研究。提出了一種改進的基于碼本映射的語音帶寬擴展算法：在碼本映射的過程中，使用加權(quán)系數(shù)來得到映射碼本。客觀測試結(jié)果表明，用此算法得到的寬帶語音的譜失真度比用一般的碼本映射降低至少2%。主觀測試結(jié)果表明，用此算法得到的寬帶語音具有更好的可懂度和自然度。 Abstract: In modern communication systems， the bandwidth of telephone speech is limited from 300Hz to 4 kHz， which reduces the intelligibility and naturalness of speech. Telephone speech bandwidth extension is researched to get wideband speech and to improve its intelligibility and naturalness， without increasing extra costs. This paper put forward an improved algorithm of speech bandwidth extension based on codebook mapping. In the process of codebook mapping， weighted coefficients were used to get mapping codebook. Objective tests show that spectral distortion of wideband speech obtained by this algorithm reduces at least 2%， comparing to conditional codebook mapping. Subjective tests show that the wideband speech obtained by this algorithm has better intelligibility and naturalness.
上傳時間： 2014-12-29
上傳用戶：15501536189
傳感器技術(shù)作為信息科學(xué)的一個重要分支，與計算機技術(shù)、自動控制技術(shù)和通信技術(shù)等一起構(gòu)成了信息技術(shù)的完整學(xué)科。在人類進入信息時代的今天，人們的一切社會活動都是以信息獲取與信息轉(zhuǎn)換為中心，傳感器作為信息獲取與信息轉(zhuǎn)換的重要手段，是信息科學(xué)最前端的一個陣地，是實現(xiàn)信息化的基礎(chǔ)技術(shù)之一。 “沒有傳感器就沒有現(xiàn)代科學(xué)技術(shù)”的觀點已為全世界所公認。以傳感器為核心的檢測系統(tǒng)就像神經(jīng)和感官一樣，源源不斷地向人類提供宏觀與微觀世界的種種信息，成為人們認識自然、改造自然的有力工具。 傳感器原理及應(yīng)用全書分為十個章結(jié)： 1、傳感器的基本特性 2、各類傳統(tǒng)與新型傳感器的工作原理與應(yīng)用 （1）應(yīng)變式傳感器 （2）電感式傳感器 （3）電容式傳感器 （4）壓電式傳感器 （5）磁電式傳感器 （6）光電式傳感器 （7）半導(dǎo)體式傳感器 （8）波與輻射式傳感器 （9）數(shù)字式傳感器（自學(xué)） （10）智能式傳感器（自學(xué)） 課程教材 1.郁有文等編著，傳感器原理及工程應(yīng)用，西安科技大學(xué)出版社，2008 2.沈躍、楊喜峰編，物理實驗教程—智能檢測技術(shù)實驗，中國石油大學(xué)出版社，2010 課程參考書 1. 傳感器與檢測技術(shù)，胡向東等編著，機械工業(yè)出版社，2009 2. 傳感器原理及應(yīng)用，王化祥編著，天津大學(xué)出版社，2007 3. 傳感技術(shù)與應(yīng)用教程，張洪潤等編著，清華大學(xué)出版社，2009 4. 傳感器原理及應(yīng)用（項目式教學(xué)），于彤編著，機械工業(yè)出版社，2008 5. 傳感器與測試技術(shù)，葉湘濱等編著，國防工業(yè)出版社，2007 6. 傳感器與檢測技術(shù)，陳杰、黃鴻編著，高等教育出版社，2003 7. Handbook of Modern Sensors(3rd Edition)，Jacob Fraden，Springer-Verlag,Inc.，2004 課程性質(zhì) 課程屬于專業(yè)基礎(chǔ)課，在專業(yè)人才培養(yǎng)中具有提高學(xué)生相關(guān)專業(yè)基礎(chǔ)理論的認知能力、增強學(xué)生從事傳感與檢測技術(shù)研究與應(yīng)用工作的適應(yīng)能力和開發(fā)創(chuàng)新能力的作用。 研究對象 傳感器技術(shù)的基本概念和理論、常用傳感器的工作原理和應(yīng)用技術(shù)。 學(xué)習(xí)目的與要求 （1）建立傳感器技術(shù)的整體概念； （2）掌握傳感器技術(shù)的基本理論、常用傳感器的工作原理和應(yīng)用技術(shù)； （3）獲得應(yīng)用傳感器設(shè)計、組建測控系統(tǒng)的基本技能； （4）培養(yǎng)學(xué)生進一步學(xué)習(xí)、研究和應(yīng)用傳感器技術(shù)的興趣； （5）為學(xué)習(xí)后續(xù)課程和獨力解決實際問題打下必要的基礎(chǔ)。 主要考核目標（包括重點及難點） （1）掌握傳感器的基本概念和基本特性； （2）掌握常用傳感器的工作原理（實驗方法）； （3）掌握常用傳感器的基本應(yīng)用（實驗技術(shù)）； （4）了解應(yīng)用傳感器設(shè)計、組建測控系統(tǒng)的基本方法； （5）了解傳感器技術(shù)的發(fā)展前沿和趨勢。 重點：傳感器的工作原理 難點：傳感器的應(yīng)用技術(shù)； 內(nèi)容涉及知識面廣，理論性、綜合性和實踐性強。
上傳時間： 2013-11-13
上傳用戶：yqs138168
The main objective of this book is to present all the relevant informationrequired for RF and micro-wave power amplifier design includingwell-known and novel theoretical approaches and practical design techniquesas well as to suggest optimum design approaches effectively combininganalytical calculations and computer-aided design. This bookcan also be very useful for lecturing to promote the analytical way ofthinking with practical verification by making a bridge between theoryand practice of RF and microwave engineering. As it often happens, anew result is the well-forgotten old one. Therefore, the demonstrationof not only new results based on new technologies or circuit schematicsis given, but some sufficiently old ideas or approaches are also introduced,that could be very useful in modern practice or could contributeto appearance of new ideas or schematic techniques.
標簽： Amplifier Microwave Design Power
上傳時間： 2013-12-22
上傳用戶：vodssv
Abstract: High-speed and low-speed data converters serve critical functions in modern broadband mobile radios. This application note outlines how todetermine high-speed data converter performance requirements in baseband sampling radio architectures. Also, system partition strategies andadvantages are outlined when considering a high-speed analog front-end (AFE) solution.
上傳時間： 2013-11-02
上傳用戶：jjj0202
Radio frequency (RF) can be a complex subject to navigate, but it does not have to be. If you are just getting started with radios or maybe you cannot find that old reference book about antenna aperture, this guide can help. It is intended to provide a basic understanding of RF technology, as well act as a quick reference for those who “know their stuff” but may be looking to brush up on that one niche term that they never quite understood. This document is also a useful reference for Maxim’s products and data sheets, an index to deeper analysis found in our application notes, and a general reference for all things RF.
上傳時間： 2013-10-23
上傳用戶：685
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