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Effect of loop delay on phase margin of first-order and second-order control loops

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1 Author(s)
Bergmans, J.W.M. ; Eindhoven Univ. of Technol., Netherlands

This paper analyzes the phase margin of first-order and second-order control loops in the presence of a loop delay and establishes rules of thumb on the maximum permissible delay for a given phase margin. Both discrete-time and continuous-time loops are considered. Results are applicable, for example, to adaptive filters and to first-order and second-order phase-locked loops.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:52 ,  Issue: 10 )