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晶体振荡器在电子设计中可以说是无处不在，并且在扮演着非常重要的角色，晶振对电路板的角色好比心脏于人，其重要性不言而喻。但是不要小看这么简单的晶振，如果设计不好，可能会直接影响到产品稳定性。相信很多工程师在做无源晶振设计时，会遇到无源晶振不起振或者输出频率有偏差的现象，有些工程师会凭借经验来解决这样的问题，也有很多工程师可能就束手无策，不知道该从何查找原因？本文将从原理上为大家讲解如何避免出现这种问题，并对无源晶振进行更合理选型。

Spring Boot整合websocket实现群聊，点对点聊天,图片发送，音频发送

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内包括C#实现的Voronoi Diagram源码，可执行程序和实验报告，请用VS2012或以上版本打开原工程文件。

计算机软件计算标准化降水指数和蒸散发指数，里面包含相关例子和数据样本，适合单点

Lumped Elements for RF and Microwave Circuits英文版，射频微波电路入门Lumped Elements for RFand microwave circuitsFor a listing of recent titles in the Artech House Microwave library,turn to the back of this bookLumped Elements for RFand microwave circuitsInder bahlArtech houseBoston londonwww.artechhouse.comLibrary of Congress Cataloging-in-Publication DataBahl, I.J.Lumped elements for RF and microwave circuits /Inder Bahlp cm.--(Artech House microwave libraryncludes bibliographical references and indexISBN 1-58053-309-4(alk. paper1. Lumped elements(Electronics) 2. Microwave integrated circuits. 3. Radiofrequency integrated circuits. 4. Passive components. I. Title. II. SeriesTK7874.54B342003621.38132-dc212003048102British Library Cataloguing in Publication DataBahl, I. J. Inder jit)Lumped elements for RF and microwave circuits.-(Artech House microwave library1. Radio circuits 2. Microwave circuits I. Title621.38412ISBN1-58053-3094Cover design by Igor Valdmar2003 ARTECH HOUSE, INC.685 Canton StreetNorwood Ma 02062All rights reserved Printed and bound in the United States of America. no part of this bookmay be reproduced or utilized in any form or by any means, electronic or mechanical, includingphotocopying, recording, or by any information storage and retrieval system, without permissionn writing from the publisherall terms mentioned in this book that are known to be trademarks or service marks have beenappropriately capitalized. Artech House cannot attest to the accuracy of this information. Useof a term in this book should not be regarded as affecting the validity of any trademark or servicemarkInternational Standard Book Number: 1-58053-309-4Library of Congress Catalog Card Number: 200304810210987654321To my adorable grandsons, Karan and Rohan Kaushal, with whom I play, cry,and laugh, and who have provided me with the idea and inspiration towrite this bookContentsPrefaceXVAcknowledgmentsXXIntroduction1.1 History of Lumped Elcements)Why Use Lumped Elements for rF andMicrowave circuits1.3 L, C, R Circuit Elements1.4 Basic Design of Lumped Elements4.1 Capacitor1.4.2 Inductor4.3 Resistorumped-Element Modelin1. 6 Fabrication1.7 ApplicationsReferencesInductors2.1 IntroductionLumped Elements for RF and Microwave Circuits2.2 Basic Definitions2.2.1 Inductance2.2.2 Magnetic Energy182.2.3 Mutual Inductance202. 2. 4 Effective Inductance202.2.5Imedang2.2.6 Time Constant2.2.7 Quality Factor222.2.8 Self-Resonant Frequency232.2.9aximum Current Ratin2.2.10 Maximum Power Rating2.2.11 Other Parameters232.3 Inductor Configurations242.4 Inductor models2. 4. 1 Analytical Models252.4.2 Coupled-Line Appiroach282.4.3 Mutual Induse arppi342.4.4 Numerical Approach362.4.5 Measurement-Based model382.5 Coupling Between Inductors452.5. 1 Low-Resistivity Substrates2.5.2 High-Resistivity Substrates462.6 Electrical Representations2.6. 1 Series and Parallel representations2.6.2 Network Representations51References52Printed Inductors573.1 Inductors on Si Substrate583.1.1 Conductor Loss3.1.2 Substrate Loss3. 1.3 Layout Considerations3.1.4 Inductor Model3. 1.5 Q-Enhancement Techniques3.1.6 Stacked-Coil Inductor803.1.7 Temperature Dependence84

太阳能光伏并网发电及其逆变控制_张兴(新能源与微电网技术)太阳能光伏并网发电及其逆变控制_张兴(新能源与微电网技术)

【实例简介】C#-串口示例demo源代码-SerialPortHelper.rar

博洛尼亚大学（University of Bologna）Stefano Mattoccia教授的讲义，是双目立体视觉入门必读资料，200页PPT系统的讲解了双目视觉原理、双目整个流程、立体匹配算法的对比及常见的问题等。网上讲解双目视觉相关知识的博客，很多都引用过该PPT中的图片。

【实例简介】所谓的正弦波SPWM（Sinusoidally PWM）技术，就是用正弦波去调制PWM信号的脉宽，即：功率管的输出为一系列等幅不等宽的矩形脉冲波形，其宽度依正弦波规律变化；对交流输出波形的幅度对称性及相位要求不是非常苛刻的应用来说，PWM信号的频率通常保持不变。这种控制策略也叫异步控制法，即载波信号的频率独立于调制波频率