In this wrok, we develop methods to reduce interconnect delay and noise caused by coupling. First, we explain the Coupling-Free Routing (CFR) problem. CFR takes a set of nets and tries to find a one-bend couple-free routing for a subset of nets. A routed net must not couple with any other routed net. We define coupling as a boolean variable which is true when the coupling of two nets is greater than some threshold. Any pair-wise coupling definition can be used. We argue that this problem is useful in both global and detailed routing
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Kastner et al. (2001) studied this question.
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