A 160 \mu Biopotential Acquisition IC With Fully Integrated IA and Motion Artifact Suppression

• Published in: IEEE transactions on biomedical circuits and systems 2012-12, Vol.6 (6), p.552-561
• Main Authors: Van Helleputte, N., Sunyoung Kim, Hyejung Kim, Jong Pal Kim, Van Hoof, C., Yazicioglu, R. F.
• Format: Article
• Language: English
• Subjects: Amplifiers, Electronic; Application specific integrated circuits; Biomedical Engineering; Biopotential recording; Capacitors; Cardiovascular Diseases - diagnosis; Cardovascular diseases; Electric Impedance; electrocardiogram (ECG); Electrocardiography; Electrocardiography - instrumentation; Electrocardiography - statistics & numerical data; Electrodes; Equipment Design; Humans; Impedance measurement; instrumentation amplifier; Motion; motion artifact reduction; Signal Processing, Computer-Assisted - instrumentation
• ISSN: 1932-4545; 1940-9990
• DOI: 10.1109/TBCAS.2012.2224113

This paper proposes a 3-channel biopotential monitoring ASIC with simultaneous electrode-tissue impedance measurements which allows real-time estimation of motion artifacts on each channel using an an external μC. The ASIC features a high performance instrumentation amplifier with fully integrated sub-Hz HPF rejecting rail-to-rail electrode-offset voltages. Each readout channel further has a programmable gain amplifier and programmable 4th order low-pass filter. Time-multiplexed 12 b SAR-ADCs are used to convert all the analog data to digital. The ASIC achieves >; 115 dB of CMRR (at 50/60 Hz), a high input impedance of >; 1 GΩ and low noise (1.3 μVrms in 100 Hz). Unlike traditional methods, the ASIC is capable of actual motion artifact suppression in the analog domain before final amplification. The complete ASIC core operates from 1.2 V with 2 V digital IOs and consumes 200 μW when all 3 channels are active.