在相对位置阶段，该算法利用布局的层次特性将需确定所有电路元件相对位置的问题缩减至仅需确定宏电路元件相对位置的问题；
In relative location phase, it only needs to determine the relative location of macro circuit component, instead of all circuit components, by using the hierarchical property of placement.
着重讨论了数字、模拟和数-模混合集成电路宏模型，并指出了尚待解决的问题。
Macromodels for digital, analog and digital-analog integrated circuits are analysed, and some uncertainties are also discussed.
然后，为了在仿真研究时有效地利用PSPICE电路仿真软件，同时也为了利用PSPICE研究控制系统，提出了有关宏模型的概念。
Next, the macromodel idea is presented to effectively use PSPICE circuit simulation software in simulation studies and study control systems by PSPICE.
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