In this paper we present the keypoints to perform multifrequency simultaneous
bioimpedance measurements using multitone signals. Concerning the frequency distribution,
tones are spread over 1kHz to 1MHz range using a custom frequency distribution which
we called Bilateral Quasi Logarithmic (BQL). BQL concentrates a higher number of tones
around the impedance relaxation and contains a frequency plan algorithm. It minimizes the
intermodulation effects due to non-linearities behaviours of the DUT and electrodes by slightly
shifting the original tones in order to guarantee a guard bandwith. Regarding the multitone
phase distribution, a Genetic Algorithm (GA) has been developed to minimize multitone Crest
Factor (CF). This allow us to maximize the resultant Signal to Noise Ratio (SNR) of the
acquisition system. This paper also presents the relation between parameters such as sampling
frequency and ADC bits with the SNR and the effect in the overall amplitude and phase error
when using multitone signals as excitation waveforms. Finally, we present characterization
results from a measurement system based on a modular PXI architecture.
CitationSánchez, B.; Bragos, R. Multifrequency simultaneous bioimpedance measurements using multitone burst signals for dynamic tissue characterization. A: International Conference on Electrical Bioimpedance. "XIVth International Confernce on Electrical Bioimedance". Gainesville, Florida: 2010, p. 1-4.
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