L. Miguel Silveira,  Nuno Vargas. 

Accurate modeling of noise coupling effects due to cross-talk via the substrate is an increasingly important concern for the design and verification of analog, digital and mixed analog-digital systems. In this paper we present a technique for model characterization that is based on a finite difference formulation whose solution is accelerated by means of a multilevel method. This technique can be used for accurate and efficient extraction of substrate coupling parameters in deep sub-micron designs.

http://csdl.computer.org/dl/proceedings/sbcci/1999/0387/00/03870026.pdf

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