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Article | REF: R7180 V1

Frequency study of sampled systems

Authors: Claude HUMBERT, Michel AUBRUN

Publication date: July 10, 1982, Review date: September 16, 2024

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AUTHORS

  • Claude HUMBERT: Engineer from the École Nationale Supérieure d'Électricité et de Mécanique de Nancy (France) - Professor at the University of Nancy I - Director, Laboratoire d'Automatique et Recherche Appliquée, part of CRAN (Centre de Recherche en Automatique de Nancy) CNRS associated unit (URA 821)

  • Michel AUBRUN: Engineer from the École Nationale Supérieure d'Électricité et de Mécanique de Nancy (France) - Professor at the University of Nancy I - Director, Laboratoire d'Automatique et Recherche Appliquée, part of CRAN (Centre de Recherche en Automatique de Nancy) CNRS associated unit (URA 821)

 INTRODUCTION

The aim of this article is to represent the frequency response of a sampled linear system using various diagrams.

As in the case of continuous linear systems (article Frequency study of continuous systems , in the present treatise), we seek to represent the open-loop frequency response.

We mainly use Nyquist or Bode diagrams (§ 2 and 3 ), although under different conditions, linked to the particular form of the sampled transfer functions.

You can also use the root locus technique 4 .

In all cases, the characteristics deduced from the various locations can be used to express open-loop and closed-loop system performance.

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