【摘要】 提出了基于USB的DDS虚拟频率特性测试仪的原理和实现方法,介绍了DDS信号发生模块的原理,使用的核心芯片AD9762的功能;USB接口模块使用的芯片CY7C64613的功能和接口的实现方法,同时给出了由Lab Windows/CVI实现的频率特性测试仪的面板和频率特性分析的过程及其他功能。最后得出结论,按该方案设计的测试仪可以很好地实现频率特性测试分析,并具有较强的可扩展性。更多还原

【Abstract】 In this paper,the principles and realization of virtual instrument based on DDS and USB for testing the frequency characteristic are introduced.The principles of DDS waveform generating module,the functions of vital IC(AD9762) for DDS,USB interface module′s pivotal IC(CY7C64613) and method of interface realization are discussed.Meanwhile,it describes that the pannel and analysis process and other functions of the virtual instrument for frequency characteristic test are designed by Lab Windows/CVI.Experiments prove that it is a good method to test and analyse frequency characteristic rapidly,and enable to extend more functions.更多还原