Investigation of wearable SENSIPLUS chip for bioimpedance measurements

Bioimpedance has emerged as a versatile and non-invasive diagnostic methodology for monitoring various physiological conditions of the human body. In this context, the detailed characterization of sensors dedicated to bioimpedance measurements is crucial to ensure the accuracy and reliability of the obtained results. In this paper a comprehensive study is proposed, suggesting the use of the SENSIPLUS chip, developed by Sensichips s.r.l., as a multifunctional microchip equipped with a precision LCR meter for low-noise impedance measurements up to 2.5 MHz, to measure inductance (L), capacitance (C) and resistance (R). Through comparative analysis with a professional LCR meter, measurements were performed on electrical circuits resembling the frequency behavior of human tissues. The reported results show a good overlap for both the resistance and reactance values, with errors well within tolerance limits. Moreover, an in-depth analysis of measurement repeatability highlights consistency and reproducibility, reinforcing the reliability of the chip in bioimpedance measurements. This study represents a promising step towards the integration in wearable devices of the SENSIPLUS chip as highly-accurate bioimpedance sensor for applications in the field of Internet of Medical Things (IoMT).