Synchronous Sampling and Demodulation in an Instrument for Multifrequency Bioimpedance Measurement

Direct sampling of known carriers is the preferred digital method for measuring biomodulation of tissue impedance. Due to limited resolution and conversion rate of analog-to-digital converters and limited processing power of available digital processors and/or lack of energy resources, conventional...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2007-08, Vol.56 (4), p.1365-1372
Main Authors: Min, M., Parve, T., Ronk, A., Annus, P., Paavle, T.
Format: Article
Language:English
Subjects:
Algorithms
Analog-digital conversion
Analog-to-digital (A/D) conversion
Bioimpedance
biomodulation
Carriers
Demodulation
Digital
digitizing
electrical bioimpedance
Energy resolution
Energy resources
Feedback
Impedance measurement
Instrumentation
Instruments
multichannel measurement
multifrequency measurement
Sampling
Sampling methods
Signal processing algorithms
Signal resolution
simultaneous measurement
Surgical implants
synchronous sampling
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Summary:Direct sampling of known carriers is the preferred digital method for measuring biomodulation of tissue impedance. Due to limited resolution and conversion rate of analog-to-digital converters and limited processing power of available digital processors and/or lack of energy resources, conventional discrete-Fourier-transform-based algorithms are not efficient in small medical devices. Knowing exactly the frequencies of carriers (and excitations), an energy-saving fast signal processing method can be developed and implemented. When sampling synchronously with a carrier, it is possible to minimize the complexity of calculations and to introduce a digital-to-analog feedback for enhancement of resolution by digitizing only the small variations between adjacent samples. The proposed system is qualified on proprietary hardware.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2007.900163