On the Nonconvergence of the Vector Fitting Algorithm

  title={On the Nonconvergence of the Vector Fitting Algorithm},
  author={Guoyong Shi},
  journal={IEEE Transactions on Circuits and Systems II: Express Briefs},
The vector fitting (VF) algorithm, as a variant of the Sanathanan-Koerner (SK) algorithm, has been widely used for frequency-domain modeling. This algorithm is essentially an iterative procedure, in which a revised linear least squares (LS) problem is solved in each step. So far, there has been hardly any analytical result in the literature on the convergence property of the SK or the VF algorithm. In this brief, several results are developed. First, it is shown that, if the frequency response… CONTINUE READING