A Net-Classification Based Analog IC Router

A new approach, called net classification method, is proposed, and by which a net-classification-based analog IC router (NCARouter) is implemented. According to the performance requirement of analog circuits, nets are classified into three main types: critical nets, general nets and power?ground nets. At the same time, all the circuit performance constraints are converted into some kinds of characteristics descriptions of nets, including geometrical constraints such as symmetry, electrical constraints such as matching, and parasitic parameters, etc. Besides, different types of nets could be routed by corresponding algorithms, in order to meet their performance requirements. Experimental results show that the new router can not only route well, but also satisfy the performance of analog circuits.