SYMMETRICAL CURRENT SOURCE FOR BIOIMPEDANCE MEASUREMENTS

Background. The object of the study is a symmetrical current source for bioimpedance measurements. The subject of the study is to determine the ways of occurrence of errors in the measurement of bioimpedance. The aim is to develop a method for reducing parasitic leakage of high-frequency current in the process of bioimpedance measurement. Materials and methods. To determine the sources of measurement error, the idea of the paths of parasitic leakage currents into the ground is used. Results. A method is proposed to eliminate the parasitic effect of leakage current from the measuring object into the ground. As a result, the bioimpedance measurement circuit is insensitive to any types of leakage currents from the measuring object into the ground. Conclusions. The proposed symmetrical current source for bioimpedance measurements makes it possible to completely eliminate the influence of parasitic leakage current from the measuring object into the ground, which positively affects the accuracy and reliability of determining the parameters of the human body.