Abstract
This comment explains why the passivity preserving frequency weighted model reduction technique of Heydari and Pedram is guaranteed to yield neither passive nor stable models in the case of double-sided weighting. It is further shown for this method that the passivity can be preserved in the single-sided weighting case only. An example is presented to show that their method may yield non-passive models for passive original systems in the case of double-sided weighting.
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