OPTIMAL SAMPLING STRATEGIES FOR BAND-PASS MEASUREMENT SIGNALS

Leopoldo Angrisani, Mauro D’Arco, Rosario Schiano Lo Moriello, Michele Vadursi

Abstract

Data Acquisition Systems (DAS) play a fundamental role in a lot of modern measurement solutions. One of the parameters characterizing a DAS is its maximum sampling frequency. As well known from Nyquist theorem, for a correct digitization of analog signals, sampling frequency must be greater than a limit value, related to signal bandwidth. With regard to band-pass signals, which are very common in telecommunications, it is possible to single out some separated ranges of licit sampling frequencies that are significantly lower than such threshold. But, how to choose the sampling frequency conveniently? It seems that there is no instrument currently on the market that selects it properly, given the signal characteristics. The paper proposes a criterion of choice aimed at optimising the DAS resources and two algorithms that perform an automatic selection of the optimal sampling frequency.

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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