The development of a low-power analog signal processing IC enables accurate recognition of multiple intra-cardiac signals with minimal power consumption, potentially useful for implantable cardiac devices.
Ultra-low-power bio-impedance ASIC may suit future implants; leaves open clinical validation before cardiac use.
A low-power analog signal processing IC is presented for the low-power heart rhythm analysis. The ASIC features 3 identical, but independent intra-ECG readout channels each equipping an analog QRS feature extractor for low-power consumption and fast diagnosis of the fatal case. A 16-level digitized sine-wave synthesizer together with a synchronous readout circuit can measure bio-impedance in the range of 0.1-4.4 kΩ with 33 mΩ(rms) resolution and higher than 97% accuracy. The proposed 25 mm² ASIC consumes only 13 μA from 2.2 V. It is a highly integrated solution offering all the functionality of acquiring multiple high quality intra-cardiac signals, requiring only a few limited numbers of external passives.
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Yan et al. (2013) studied this question.
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