On spectral conditions for positive realness of transfer function matrices

@article{Shorten2008OnSC,
  title={On spectral conditions for positive realness of transfer function matrices},
  author={Robert Shorten and Peter G. Curran and Kai Wulff and Christopher Paul King and Ezra Zeheb},
  journal={2008 American Control Conference},
  year={2008},
  pages={1076-1079}
}
Necessary and sufficient conditions for positive realness of general transfer function matrices are derived. These conditions can be checked using eigenvalue solvers for both proper and strictly proper transfer function matrices. 

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