A 1.55 μW Bio-Impedance Measurement System for Implantable Cardiac Pacemakers in 0.18 μm CMOS
M. Zamani (University of Tehran)
Y. Rezaeiyan (University of Tehran)
Omid Shoaei (University of Tehran)
WA Serdijn (TU Delft - Bio-Electronics)
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Abstract
This paper presents an implantable bio-impedance measurement system for cardiac pacemakers. The fully integrated system features a lowpower analog front-end and pulse widthmodulated output. The bio-impedance readout benefits from voltage to time conversion to achieve a very low power consumption for wirelessly transmitting the data outside the body. The proposed IC is fabricated in a 0.18μmCMOSprocess and is capable ofmeasuring the bio-impedance at 2 kHz over a wide dynamic range from 100λ to 3.3 kλ with 1.35 λrms accuracy and 1 μA maximum current injection while consuming just 1.55 μA from a 1 V supply.
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