Microcontroller based bioimpedance analyzer

The device presented in this study is a four-probe, multifrequency, portable bioimpedance analyzer based on the magnitude-ratio and phase-difference detection principles. The system is built around a digital sine-wave generator, a voltage controlled current source, a phase-gain detector and a microcontroller unit. The Cole-Cole parameters, namely R
₀
, R
_infin
, f
_c
and alpha are also calculated. The accuracy and precision of the device are checked against the HP 4284A LCR meter using different RC test loads.