Advantages and limitations of an approach to bioimpedance data acquisition and processing relying on fast low bit rate ADCs

Abstract

Bioimpedance signal analysis has to be performed in a rather wide frequency range. If fast ADCs, capable of taking signal sample values at very high sampling frequencies, are used for that, their bit rates typically are very low. It is suggested to use pseudo-randomized quantizing and special methods for handling the obtained data to provide for bioimpedance data acquisition under the required conditions and for demodulation of multi-frequency carriers of bioimpedance signals in the required frequency range. The suggested methods are described, computer simulated and discussed.