The excellence of analog circuits can be divided into two concepts. One is circuit process analysis, such as dynamic analysis and equivalent analysis. It is necessary to learn math well, especially when writing papers. But the general circuit structure analysis is mainly some simple mathematical operations, mainly the relationship between input and output, including the response relationship with RLC. The future work is mainly to be familiar with these relationships, but there are not many cases of response analysis. You just need to know the basic relationship.