把这Analog Circuit Design with Structual Methodolgy本书看了看，觉得要学的东西实在是太多了
这里面的一个思想就是强调system thinking
感觉对信号系统里的控制理论和电路的理解都有很高的要求

some tips：
structural methodology in analog ic design
1. description of the system functionality at the high level of abstraction using the signal flow graph;

2. equivalent transformations and modifications of the system graphto the forms where all important parameters are controlled by dedicated feedback loops;

3. implementations of these graphs using the library of elementary cells

4. simplified, single-glance estimation of possible implementations of the most attractive ones

5. consideration of the non-linear effects (saturation , short circuit , input overload) and adding to thecircuit the necessary clamps and protection units

6. simulation of a small number of chosen implementations and selection of the final circuit