Daniela Loi, Claudia Palla, Gianfranco Marongiu, Michele Gallamini
Multifrequency measurement, Constant Current Source,Bioelectrical impedance measurement
We describe a programmable wide frequency bandwidth current source realized using a COTS-based (Commercial Off-the-Shelf) design. It is capable of injecting sinusoidal, square or triangle current waveforms of amplitude ranging from 12µApp to 1.2mApp and frequency up to 1MHz, into the human body through a pair of electrodes. The device is controlled by a graphic user-friendly interface, which allows users to monitor data transmission and acquisition as well as to set current injection parameters. In addi- tion to current injection, the system is meant for sensing in real time the resulting response. The measured voltage drop across tissue impedance can be amplified with a pro- grammable gain and converted into digital values with 10 bits of resolution before being transmitted to a PC through USB transmission for further processing.
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