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为了在CDMA系统中更好地应用QDPSK数字调制方式，在分析四相相对移相（QDPSK)信号调制解调原理的基础上，设计了一种QDPSK调制解调电路，它包括串并转换、差分编码、四相载波产生和选相、相干解调、差分译码和并串转换电路。在MAX+PLUSⅡ软件平台上，进行了编译和波形仿真。综合后下载到复杂可编程逻辑器件EPM7128SLC84-15中 ...

针对理工科试题与答案通常都含有公式、图形的特点，设计并实现了一个适用于理工科的试题库与组卷系统，采用嵌入ActiveX控件来操作Word文档的方式，支持的试题类型多样，并可以按关键字查询Word试题内容。多个用户可以在不同的地点同时录入试题，生成的试卷直接以Word文档的形式下载到本地，并具有在线考试功能。系统采用分 ...

为提升虚拟仪器传输速率与实时性能，扩展监测范围，在VC的软件平台上设计了一种全功能虚拟示波器。与传统虚拟示波器相比，该系统采用嵌入式系统完成信号采集，采用工业以太网为传输介质，通过线性插值算法和多线程编程思想，实现波形显示、参数计算、频谱分析以及波形存储及回放功能。实验结果表明，该虚拟示波器可以实现20 ...

机电类比法是一种把机械量通过一定的计算等效类比为电量的方法，其在对电子机械系统的分析中应用非常广泛。它能够把一个较复杂的机械系统类比为我们熟知的电路系统来进行分析，从而使问题的分析得到简化。本文通过对振弦式传感器的分析介绍了机电类比法，并对使用电路进行了相关的分析。 Summary：The electromechanic ...

友善之臂的QtEmbedded实例教程 第一章 LINUX 图形用户界面 GUI 介绍.....................................................................................1 1.1  常用 GUI 介绍...................................................................................................................1 1.2  ...

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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 a ...

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 a ...

Single-Ended and Differential S-Parameters Differential circuits have been important incommunication systems for many years. In the past,differential communication circuits operated at lowfrequencies, where they could be designed andanalyzed using lumped-element models andtechniques. With the freque ...

Agilent AN 154 S-Parameter Design Application Note S参数的设计与应用 The need for new high-frequency, solid-state circuitdesign techniques has been recognized both by microwaveengineers and circuit designers. These engineersare being asked to design solid state circuitsthat will operate at higher an ...