Abstract
This article describes the modeling of a resistive voltage divider (RVD) by rational functions using the vector fitting (VF) tool. The method is applied to ratio and phase displacement measurements over a wide frequency range. A Monte Carlo simulation-based sensitivity analysis was carried out to properly estimate the model uncertainty. The modeling tool proved to be an advantageous alternative with suitable adherence to the traced points, not exceeding a few parts in 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> . Real and imaginary parts can be taken into account in the same fitting, preserving their correlation for the uncertainty estimation. Such a black-box approach can also help to estimate intermediate and above limit points since the transfer function is given by the tool.
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