VARIABLE FREQUENCY SIGNAL GENERATOR FOR NON INVASIVE BIO-IMPEDANCE DIAGNOSIS

This paper deals with design of signal generator specifically used for bio-impedance<br>measurement purposes. During bio-impedance diagnosis systems the measuring parameter varies as a<br>function of frequency of the applied signal. The accuracy of the diagnosis mainly depends on the exact<br>value of frequency for which there is a wide variation in the output response. The proposed system<br>implements signal generator circuit which suits for non invasive bio-impedance measurement<br>applications. Hardware section of the system composed of signal generator IC, Isolation transformer,<br>isolated &amp; regulated power supply, Operational amplifier IC and Surface electrodes. The study has been<br>done with 10 individuals for obtaining the value of frequency for which there was good response in<br>output bio-impedance value.