Abstract
As a low-cost, non-destructive analysis technique, bioimpedance has lately seen a broad range of utilization in different areas. This has resulted in an increased necessity for portable and inexpensive instrumentation. Analog devices have recently released AD5940, an analog front-end (AFE) that incorporates electrical impedance spectroscopy (EIS) and potentiostat functionality in one chip, presenting opportunities for such instruments. To date, the Oslo Bioimpedance and Medical Technology Group is involved in many bioimpedance studies ranging from the food industry, human studies, stem cell monitoring, optogenetics, and more. This has resulted in a deficiency of instruments available, and an inexpensive spectrometer based on the AD5940 could be beneficial. Considering that, this thesis focuses on studying the feasibility of an AD5940 AFE based impedance spectrometer and potentiostat and identifying suitable applications for it. AD5940 evaluation kits were used for measurements, together with commercial laboratory instruments for comparison. Software and hardware modification were performed to improve and adapt the system for different cases. Through experimentation and measurement analysis, it was concluded that the AD5940 AFE in confined conditions and inside its operational range did offer equivalent performance with the commercial instruments. Considering that, together with its low power consumption and broad flexibility it offers, the AD5940 AFE opens many possibilities for future applications. Both in the form of instrumentation as well as an integrated part of wearable and implantable monitoring device.