THERMAL Σ-Δ MODULATOR: PERFORMANCE ANALYSIS

L. S. Palma, A. Oliveira, R. C. S. Freire, A. B. Fontes

Abstract

This work presents the system performance analysis, in terms of frequency response and system resolution, of a 1-bit first-order Σ-&Delta thermal modulator. In this system model, some of the operations conversion is performed by the thermoresistive sensor, which operates at constant temperature method. The system performance analysis was realized with a sampled version of the continuous time thermal Σ-&Delta modulator. It will be shown that system performance is dependent on the system oversampling ratio (OSR) and the system transfer function pole and zero which depends on thermal and physical sensor characteristics and system operation conditions. This system was proposed as a solar radiation meter, but it may be applied to fluid velocity measurement.

Keywords

transducer, thermal Σ-&Delta modulation, frequency response, thermoresistive sensor

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PWC-2006-TC4-077u.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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