Abstract
The commercial availability of integrated circuits with bioimpedance sensing functionality is advancing the opportunity for practical wearable systems that monitor the electrical impedance properties of tissues to identify physiological features in support of health-focused applications. This technical note characterizes the performance of the MAX3000x (resistance/reactance accuracy, power modes, filtering, gains) and is available for on-board processing (electrode detection) for localized bioimpedance measurements. Measurements of discrete impedances that are representative of localized tissue bioimpedance support that this IC has a relative error of <10% for the resistance component of complex impedance measurements, but can also measure relative alterations in the 250 m range. The application of the MAX3000x for monitoring localized bicep tissues during activity is presented to highlight its functionality, as well as its limitations, for multi-frequency measurements. This device is a very-small-form-factor single-chip solution for measuring multi-frequency bioimpedance with significant on-board processing with potential for wearable applications.
Highlights
The passive electrical impedance of biological tissues, often referred to as tissue bioimpedance, is being widely investigated as a technique for identifying physiological features in support of health-focused applications [1]
These features make this an attractive option for wearable systems, but require further investigation of performance. This provides the motivation for this technical note, which is to characterize the performance of the Maxim Integrated MAX30001/30002 for localized bioimpedance measurements
The voltage that is monitored by the MAX3000x is high-pass filtered (HPF), demodulated to DC, anti-alias filtered (AAF), amplified by a programmable gain amplifier (PGA), and converted into a digital representation using a Σ∆ analog-to-digital converter (ADC) for further digital processing
Summary
The passive electrical impedance of biological tissues, often referred to as tissue bioimpedance, is being widely investigated as a technique for identifying physiological features in support of health-focused applications [1]. These features make this an attractive option for wearable systems, but require further investigation of performance. This provides the motivation for this technical note, which is to characterize the performance of the Maxim Integrated MAX30001/30002 for localized bioimpedance measurements
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