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基于滤波器设计在模拟电子技术实验教学中的基础性重要作用,阐述了滤波器参数归一化表的推导过程,以帮助学生更深层次的理解滤波器的原理与设计方法。通过比较RC双极点滤波器传输函数和归一化之后的传输函数,得到归一化的电阻电容值,进而通过求解归一化计算得出实际电路中的元器件的参数。采用同样的方法可以得出三阶滤波器的参数,将二阶滤波器和三阶滤波器级联就可以得到任意阶的滤波器。实际实验测试证明了此方法的有效性。介绍了计算机辅助设计的方法,帮助实验中的滤波器指标调试,也方便了学生的自主探索学习。针对实验教学学生实际调试中可能出现的问题提出了一些解决对策,给出多种解决问题的思路。
Based on the fundamental role of filter design in analog electronics experiment teaching, the derivation of filter normalization table is expounded to help students to understand the principle and design method of filter deeply. By comparing the transfer function of RC double-pole filter and the normalized transfer function, the normalized value of resistance and capacitance can be obtained, and then the parameters of the actual circuit can be calculated by solving the normalization. The same method can be used to obtain the parameters of the third-order filter, and the second-order filter and the third-order filter can be cascaded to obtain an arbitrary-order filter. The actual experimental test proved the effectiveness of this method. The method of computer aided design is introduced, which can help the debugging of the filter index in the experiment and facilitate the students’ autonomous exploration and study. Aiming at the possible problems in practical debugging of experimental teaching students, some countermeasures are put forward, and various solutions to the problems are given.