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A sinusoidal current generator and a TEB decomposer for measuring bioimpedance in a cardiac pacemaker, using an analog wavelet filter

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Abstract

This paper describes a novel sinusoidal signal generator for thoracic bioimpedance measurement system and signals decomposition filter, based on an analog wavelet filter approach. The proposed system can be adjusted in amplitude, frequency, and phase for differents sinusoidal injection currents, presenting a harmonic distortion rate lower than \(1.4\, \%\) and a spurious-free dynamic range (SFDR) of \(\mathrm {36.67\,dB}\). Applying the proposed sinusoidal generator to a bioimpedance measurement system (TEB), the obtained recovery accuracy was \(\mathrm {0.11\,\mathrm \Omega _{rms}}\). Also, an analog wavelet filter approach was implemented on a new design of a TEB decomposing system, in order to extract its cardiac and respiratory components. From a system validation of the TEB decomposer, it was able to recover efficiently the cardiac and respiratory signals with a root mean square error (RMSE) below \(\mathrm {92.73\,m\mathrm \Omega _{rms}}\), even under dynamic variations of its parameters over time. Finally, previous works indicate that the proposed analog wavelet filter system can be implemented using a ultra low-power circuit design techniques, which allows its use in implantable systems such as pacemakers.

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Authors and Affiliations

  1. Department of Electronics, Federal Institute of Mineiro Triangle, Paracatu-MG, Brazil

    Guilherme Tarcísio Leal

  2. University of Brasilia, Brasília-DF, Brazil

    Gabriela Meira de Moura Rodrigues

  3. Electronics Engineering, Faculty of Gama, University of Brasilia, Brasília-DF, Brazil

    Sandro Augusto Pavlik Haddad

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  1. Guilherme Tarcísio Leal
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  2. Gabriela Meira de Moura Rodrigues
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  3. Sandro Augusto Pavlik Haddad
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Correspondence to Guilherme Tarcísio Leal.

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Acknowledgment to the Federal Institute of Mineiro Triangle (IFTM) for supporting the development of this research.

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Leal, G.T., de Moura Rodrigues, G.M. & Haddad, S.A.P. A sinusoidal current generator and a TEB decomposer for measuring bioimpedance in a cardiac pacemaker, using an analog wavelet filter. Analog Integr Circ Sig Process 108, 525–538 (2021). https://doi.org/10.1007/s10470-021-01896-x

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  • DOI: https://doi.org/10.1007/s10470-021-01896-x

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