Circuit Extraction via Time-Domain Vector Fitting
S. Grivet-Talocia, F. G. Canavero, I. S. Stievano, I. A. Maio
Electromagnetic Compatibility, 2004. EMC 2004. 2004 InternationalSymposium
Volume 3, 9-13 Aug.
1005 - 1010
This paper introduces a new algorithm for the automatic synthesis of SPICE-ready equivalent circuits of complexn multiport lumped interconnect structures. The method is named Time-Domain Vector Fitting (TD-VF) due to its analogy to the well-known Vector Fitting algorithm, which operates in frequency domain. The TD-VF computes a rational approximation of the transfer matrix for the structure under modeling using as raw data its transient port responses to suitable excitations. These include, e.g., the case of transient port scattering responses as typically obtained by full-wave electromagnetic solvers based on the Finite-Differences Time-Domain (FDTD) or Finite Integration (FIT) methods. The TD-VF algorithm works entirely
in the time domain, without requiring any knowledge of the
frequency-domain responses. This allows direct processing of
possibly truncated transient responses, therefore allowing for
short full-wave simulations. This paper shows that the accuracy
level achiavable by TD-VF is excellent. Hence, passivity can be
enforced a posteriori using the spectral properties of associated
Hamiltonian matrices. Several examples of package, connectors,
and discontinuities are provided as illustration.
Back to References