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.