VARIABLE FREQUENCY SIGNAL GENERATOR FOR NON INVASIVE BIO-IMPEDANCE DIAGNOSIS

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