【作者】 李燕杰；

【导师】 耿肇英；

【作者基本信息】 河北师范大学 ， 计算机应用技术， 2007， 硕士

【摘要】 “虚拟信号源”是河北省教育厅“电工电子实验虚拟仪器研制”项目的一部分。这个项目的目的是为大学电工电子实验室提供廉价的成套实验仪器,包括电源、低频信号源、示波器、频谱分析仪、逻辑分析仪、失真分析仪、直流万用表、交流电压表等仪器,这些仪器既要能满足大学电工电子实验要求,价格还要在合理的范围之内,以应付高校扩招的压力。本项目就是要用廉价的中小规模元器件设计一块高性能的A/D、D/A采集卡,利用实验室淘汰的计算机,组成完成以上所列仪器功能的虚拟实验仪器系统。学生使用该虚拟实验仪器系统,能完成教学计划所要求的所有电工电子实验。本课题采用EDA技术设计高性能的A/D、D/A采集卡,利用先进的图形化语言LabView设计仪器控制面板。本人在项目中承担虚拟信号源的研究与设计,要完成的工作包括:用廉价中小规模元器件,设计能输出指定频率和幅度的任意波形低频信号源的硬件部分;用LabView软件设计在计算机上运行的仪器控制面板;通过EPP并口实现控制面板与信号源硬件部分的通讯。本课题的难点是用廉价的中小规模电子元器件设计高速的D/A系统。本文对以上各部分的研究与设计进行了详细的论述,对虚拟信号源的系统误差进行了分析,提出了基于SOPC实现高性能的虚拟信号源的展望。此外,本文对近期国内发表的有关DDS论文中,一些作者提出的计算输出信号频率精度的方法进行了研究与改进,对设计DDS信号源有很好的指导意义;本文涉及虚拟信号源开发中的关键技术和主要方法,为进一步研究和开发虚拟仪器提供了一种有效可行的设计方法。更多还原

【Abstract】 “Electrical and Electronic Laboratory Virtual Instrument”is a project of Hebei Provincial Department of Education. The aim of the project is to provide low-cost packaged experimental instruments for university electronic laboratory, which includes the power, the low-frequency signal generator, the oscilloscope,the spectrum analyzer,the logic analyzer, the distortion analyzer,the DC multimeter,the AC voltage equipment,etc. The equipments should be able to meet the requirements of the electrical and electronic experiments, but also at a reasonable price range, to cope with the pressure of college enrollment.The project is to design a high-performance A/D and D/A acquisition card, which composes the virtual instrument systems with used computers.The topic is the study and design of virtual signal source. The work includes: designing hardware made of small-scale electronic components that can output the low-frequency arbitrary waveform designated frequency and amplitude;proceduring the preparation of the control panel used LabView software;communicating the control panel with the hardware computer by EPP. The thorny issue is to design high-speed D/AC system using the small-scale electronic components.This paper detailed discourses upon the research and design of Virtual Signal Source, and analyses system error and also proposes a prospect using SOPC to achieve high performance virtual signal source.This paper involves the key technology and methods for the virtual signal source, lay the foundation for further research and development. On basis of this system, we can develop a specific application system.更多还原