Autors: Petrova, G. I.
Title: Influence of electrode impedance changes on the common-mode rejection ratio in bioimpedance measurements
Keywords: CMRR, bioelectrical impedance, electrode-skin impedance

Abstract: Bioelectrical impedance in vivo measurements suffer from many potential sources of error due to the patient-instrument interface. The total common-mode rejection ratio (CMRRT) was investigated experimentally for three measurement channel circuit versions, including electrode-skin impedance imbalance. The first version was of the `classical' type. The second one makes use of a differential filter at the input of the instrumentation amplifier. The third circuit was a frequency-converting structure, where the signal was demodulated before being amplified. The differential demodulator was based on synchronous sampling using floating capacitors. The experiments were accomplished with simulated imbalance of the real and imaginary parts of electrode-skin impedances. To reduce unwanted common-mode voltage, a differential accurately balanced current source was used. Considering an application in impedance cardiography, the experiments were carried out at a single frequency of 40 kHz.

References

    Issue

    Physiological Measurement, vol. 20, issue 4, pp. N11, 1999, United States, IOP, ISSN 0967-3334

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    Вид: статия в списание, публикация в издание с импакт фактор, публикация в реферирано издание, индексирана в Scopus