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.
Original language | English |
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Article number | 8248760 |
Pages (from-to) | 211-221 |
Number of pages | 11 |
Journal | IEEE Transactions on Biomedical Circuits and Systems |
Volume | 12 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2018 |
Keywords
- Analog circuit design
- bio-impedance
- biosensor
- cardiac tissue
- CMOS
- impedance measurement
- instrumentation amplifier
- low power
- programmable amplifier