Technologies, Volume 8, Issue 4 (December 2020) – 31 articles
Cover Story (view full-size image): Bio-impedances are characterized by a Cole model behavior, not easily implementable with passive components since they do not provide tunability. Two design methodologies, emulating both AgCl electrode and skin tissue Cole models for testing and verification of electrical bio-impedance circuits and systems, are compared. The models are implemented with active components and capture bio-impedance behaviors up to 10 kHz, offering tunability of the fractional capacitors’ parameters. The main objective is to build a tunable active integrated circuitry block that can be utilized as a subject under test (SUT) and electrode equivalent in bio-impedance measurement applications. A tetrapolar impedance setup, typical in bio-impedance measurements, is used to demonstrate the performance and accuracy of the presented architectures via Spectre Monte Carlo simulation. View this paper
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