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Article Dans Une Revue Measurement - Journal of the International Measurement Confederation (IMEKO) Année : 2018

Level-Crossing ADC Design and Evaluation Methodology for Normal and Pathological Electrocardiogram Signals Measurement

Résumé

In this paper, the level-crossing analog-to-digital converter (LC-ADC) is employed for electrocardiogram signals measurement. A biosignal-dependent design methodology for the LC-ADC is proposed to avoid distortion, caused by slope changes, leading to an 8-bit LC-ADC topology with a 10-kHz and 12-bit time counter. To evaluate the proposed design, the LC-ADC is modeled then evaluated regarding systematic time-quantization error and analog components’ non-idealities. A total number of 75 real electrocardiogram records from Physionet database with different waveforms and pathologies are used. LC-ADC evaluation results for time-quantization error show that 100% of the reconstructed signals have a signal-to-distortion ratio higher than 21 dB, which is the value of good quality. The evaluation of comparators’ offset voltage impact is analyzed with different ranges of the signal-to-distortion ratio showing the robustness of the proposed design methodology. Internal digital-to-analog converters (DACs) non-linearity impacts are evaluated showing only 1-dB degradation for signal distortion.
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Dates et versions

hal-01767677 , version 1 (16-04-2018)

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Mariam Tlili, Manel Ben-Romdhane, Asma Maalej, Francois Rivet, Dominique Dallet, et al.. Level-Crossing ADC Design and Evaluation Methodology for Normal and Pathological Electrocardiogram Signals Measurement. Measurement - Journal of the International Measurement Confederation (IMEKO), 2018, 124, pp.423-425. ⟨10.1016/j.measurement.2018.03.032⟩. ⟨hal-01767677⟩
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