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运算放大器教学中的若干问题探析 |
Discussions on Several Issues in Operational Amplifier Teaching |
投稿时间:2021-03-27 修订日期:2021-04-13 |
DOI: |
中文关键词: 运算放大器 虚短 虚断 地 |
英文关键词: operational amplifier virtual short-circuit virtual open-circuit ground |
基金项目:上海交通大学2020年教育教学研究项目(JYJX20 0081);上海海事大学电路原理重点建设课程项目(WG310170)。 |
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中文摘要: |
针对电路理论课程中运算放大器(运放)的教学,对教学内容中的若干问题进行了讨论。辨析了不同运放模型符号之间的区别,厘清了虚短和虚断概念并给出了正确表述,说明了含运放电路含“地”的必要性,探讨了对含运放电路分析结果所必须进行得校核,指出了现有运放模型在反映放大倍数频率响应方面的局限性。讨论内容对电路理论课中运放相关教学内容的完善有积极意义。 |
英文摘要: |
For teaching operational amplifier (op-amp) in circuit theory course, several issues in op-amp teaching are discussed. This paper points out the advantages and disadvantages of different symbols of op-amps, clarifies the concept of virtual short-circuit and virtual open-circuit and gives their correct expressions, illustrates the necessity of "ground" in op-amp circuits, explores the verifications that need to be carried out on the op-amp circuit analysis results, proposes the limitations of the existing op-amp ideal model in reflecting frequency response of its gain. The discussions are beneficial to improve the relevant teaching contents in the course of circuit theory. |
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