李大宇, 张宇, 韩永光. 面向实践教学的模块化幅频特性测试仪的设计与实现[J]. 实验科学与技术, 2020, 18(5): 110-114. DOI: 10.12179/1672-4550.20190132
引用本文: 李大宇, 张宇, 韩永光. 面向实践教学的模块化幅频特性测试仪的设计与实现[J]. 实验科学与技术, 2020, 18(5): 110-114. DOI: 10.12179/1672-4550.20190132
LI Dayu, ZHANG Yu, HAN Yongguang. Design and Implementation of Modular Amplitude-frequency Characteristic Tester for Practice Teaching[J]. Experiment Science and Technology, 2020, 18(5): 110-114. DOI: 10.12179/1672-4550.20190132
Citation: LI Dayu, ZHANG Yu, HAN Yongguang. Design and Implementation of Modular Amplitude-frequency Characteristic Tester for Practice Teaching[J]. Experiment Science and Technology, 2020, 18(5): 110-114. DOI: 10.12179/1672-4550.20190132

面向实践教学的模块化幅频特性测试仪的设计与实现

Design and Implementation of Modular Amplitude-frequency Characteristic Tester for Practice Teaching

  • 摘要: 电子系统设计是培养电子信息类相关专业学生实践创新能力的重要一环。模块化设计方法将系统电路设计成可拓展的功能电路模块,设计过程中重视电路设计、程序设计过程,有利于提高学生的设计能力、培养学生的创新意识,在学生的实践过程中发挥了重要作用。该设计根据正交乘积法测量幅频特性的原理实现了一套模块化的幅频特性测试系统,采用Tiva C LaunchPad单片机评估板做主控制器,控制DDS芯片AD9854产生正交扫频信号,采用模拟乘法器AD835设计正交解调电路,利用单片机及其片上模数转换器(ADC)完成对两路正交信号的采样和数据处理。经实验测试分析,设计方案可行,模块化的系统设计适合于应用在实验或课程设计等教学环节。

     

    Abstract: Electronic system design is of great importance to cultivate the practical and innovation ability of students majoring in electronic and information engineering. The system circuit is designed as an expandable functional circuit module by modular design method, during which the circuit design and programming design processes are valued. As a result, it contributes to improve students’ design ability and innovation cultivation, and plays a critical role in their practice process. According to the principle of measuring amplitude-frequency characteristics by the orthogonal product method, a testing system of modular amplitude-frequency characteristic is designed. The evaluation board of Tiva C LaunchPad is used as the main controller to control the AD9854 chip to produce quadrature frequency sweeping signal, and the analog multiplier AD835 is used to design quadrature demodulation circuit. The two quadrature signals are sampled and processed by micro control unit and the on-chip analog to digital converter (ADC). It is analyzed by the experimental test that the scheme is feasible and the modular system design is appropriately applied to the experiment, course design and other teaching procedures.

     

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