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A Note on Tests for Positive-Real Functions

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2 Author(s)
Chen, M.Z.Q. ; Dept. of Eng., Univ. of Leicester, Leicester, MA ; Smith, M.C.

This technical note presents a modified test for positive-realness of scalar real-rational functions which avoids the need to test residue conditions. Necessary and sufficient conditions for the positive-realness of some classes of low-order real-rational functions are given by making use of the modified test.

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Automatic Control, IEEE Transactions on  (Volume:54 ,  Issue: 2 )