Key result
An ultra-low power bio-impedance sensor for wrist watch-type blood pressure monitoring achieved a settling time of 276 μs and consumed only 55.77 μW in simulation.
The proposed bio-impedance sensor design achieves ultra-low power consumption and fast settling time, making it suitable for portable, wrist watch-type blood pressure monitoring systems.
Simulation suggests feasibility for wearable BP monitoring; leaves open prototype validation and clinical testing.
An ultra-low power bio-impedance sensor for wrist watch-type blood pressure monitoring system is implemented in 0.18 μm CMOS technology under 1.8 V supply. The duty-cycled current generator (DCG) enables low power and high amplitude current injection with 93.58% power reduction in a current generator block. A fast-settling readout circuit with DC balanced amplifier reduces settling time to 276 μs, allowing bio-impedance signal acquisition even when the motion artifact induced circuit transient occurs. The simulated 2.125 mm² single chip bio-impedance sensor consumes only 55.77 μW.
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Kim et al. (2017) studied Blood pressure monitoring. Ultra-low power bio-impedance sensor was evaluated on Power consumption and settling time. An ultra-low power bio-impedance sensor for wrist watch-type blood pressure monitoring achieved a settling time of 276 μs and consumed only 55.77 μW in simulation.
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