Practical considerations for passive reduction of RLC circuits
ICCAD '99 Proceedings of the 1999 IEEE/ACM international conference on Computer-aided design
PRIMA: passive reduced-order interconnect macromodeling algorithm
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Efficient linear circuit analysis by Pade approximation via the Lanczos process
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
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The simplest interconnection model for an integrated circuit is a discrete RC-circuit governed by a system Ri′ + Di = u′ of differential equations with positive definite matrices R and D. Such a system usually has a high dimension, so it is natural to solve it approximately. Traditionally it is investigated by means of Krylov subspace methods. In this article a close approach is discussed. This approach admits an effective estimation of accuracy. It is based on the approximation of the main factor eAt (here A = −R−1D) in the impulse response H(t) = eAt R−1 by a polynomial r(A, t) = a0(t)1 + a1(t)A + ··· +an(t)An with the coefficients ak(t) depending on t or by a rational function of a similar form.