High-Pass ΣΔ Converter Design Using a State-Space Approach and Its Application to Cardiac Signal Acquisition

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Abstract

Cardiac signal acquisition with high linearity and accuracy of the high-pass cut-off frequency imposes a challenge on the implementation of the analog preprocessing and the analog-to-digital converter. This paper describes a state-space-based methodology for designing high-pass sigma-delta (HP Sigma \Delta topologies with high linearity, targeting high accuracy of the high-pass cut-off frequency. Intermediate functions are evaluated mathematically to compare the proposed HP \Sigma \Delta topologies with respect to dynamic range. A sensitivity performance analysis of the noise transfer function with respect to integrator nonidealities and coefficient variations is also described. Finally, to illustrate the design approach, an orthonormal HP \Sigma \Delta modulator is designed to be implemented in 0.18 \mum CMOS technology, is tested with real prerecorded ECG signals.

Original languageEnglish
Pages (from-to)483-494
Number of pages12
JournalIEEE Transactions on Biomedical Circuits and Systems
Volume12
Issue number3
DOIs
Publication statusPublished - 2018

Keywords

  • baseline wandering
  • ECG
  • high-pass sigma-delta converter
  • intermediate functions
  • orthonormal
  • sensitivity
  • state-space synthesis

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