Abstract
Electrical Bioimpedance Analysis have been widely used as a non-invasive technique for characterizing tissues. Most systems use a wideband and a high precision instrumentation, specially the current source. The objective of this work is to compare the Howland circuit with two OTA-based floating voltage controlled current sources. The results show that the class-AB OTA has a wider output current frequency response and the output impedance is 226% bigger than the Howland circuit at 1 MHz. The class-AB OTA circuit presents a power consumption of 0.5 mW. The results might be useful for cell impedance measurements and for very low power bioimpedance applications.
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© 2011 Springer-Verlag Berlin Heidelberg
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Bertemes-Filho, P., Vincence, V.C., Zanatta, I.X. (2011). A Comparison of Modified CMOS Transconductance Amplifiers with Howland Circuit for Low Power Electrical Bioimpedance Instrumentation. In: Jobbágy, Á. (eds) 5th European Conference of the International Federation for Medical and Biological Engineering. IFMBE Proceedings, vol 37. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-23508-5_53
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DOI: https://doi.org/10.1007/978-3-642-23508-5_53
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-23507-8
Online ISBN: 978-3-642-23508-5
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