Journal ArticleDOI
A 0.5-V Sub-10-μW 15.28-mΩ/√Hz Bio-Impedance Sensor IC With Sub-1° Phase Error
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TLDR
Experimental measurement on the human chest of Bio-Z sensor IC demonstrates its capabilities of thoracic impedance variance (TIV), impedance cardiography (ICG) monitoring and linearity performance shows that it is suitable for fluid status monitoring applications.Abstract:
Continuous monitoring of fluid status through bio-impedance (Bio-Z) measurement of thoracic magnitude or phase is critical in reducing the mortality of chronic heart failure (CHF) patients. However, the stringent power constraints of implantable devices force the design of Bio-Z sensors to be highly challenging. We present a sub-10- $\mu \text{W}$ Bio-Z sensor IC operating from a 0.5 V-supply, sustaining a sub-1° of phase error even under 10% of supply and 0 °C–70 °C of temperature variations. Fabricated in a 65-nm CMOS process, this sensor IC exhibits a 15.28- $\text{m}\Omega /\surd $ Hz of input-referred impedance noise performance, occupying a 4.83 mm2. Its linearity performance shows that the magnitude and the phase of Bio-Z can be measured within the error of 2% and 0.4°, respectively, given that the magnitude of load impedance is less than 126 $\Omega $ , and thus, it is suitable for fluid status monitoring applications. Experimental measurement on the human chest demonstrates its capabilities of thoracic impedance variance (TIV) and impedance cardiography (ICG) monitoring.read more
Citations
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Design of Sub-10-<i>μ</i>W Sub-0.1% THD Sinusoidal Current Generator IC for Bio-Impedance Sensing
TL;DR: In this paper , a low-power, low-distortion, and compact mixed-signal sinusoidal current generator (CG) IC for bio-impedance (Bio-Z) sensing applications is presented.
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A 0.02mm 2 100dB-DR Impedance Monitoring IC with PWM-Dual GRO Architecture
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On-Chip Sinusoidal Signal Generators for Electrical Impedance Spectroscopy: Methodological Review
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