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Sensors 2015, 15(10), 25139-25156; doi:10.3390/s151025139

Fully Integrated Biopotential Acquisition Analog Front-End IC

Department of Electronics, Chungnam National University, Daejeon, 305-764, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 27 August 2015 / Revised: 20 September 2015 / Accepted: 23 September 2015 / Published: 30 September 2015
(This article belongs to the Section Physical Sensors)

Abstract

A biopotential acquisition analog front-end (AFE) integrated circuit (IC) is presented. The biopotential AFE includes a capacitively coupled chopper instrumentation amplifier (CCIA) to achieve low input referred noise (IRN) and to block unwanted DC potential signals. A DC servo loop (DSL) is designed to minimize the offset voltage in the chopper amplifier and low frequency respiration artifacts. An AC coupled ripple rejection loop (RRL) is employed to reduce ripple due to chopper stabilization. A capacitive impedance boosting loop (CIBL) is designed to enhance the input impedance and common mode rejection ratio (CMRR) without additional power consumption, even under an external electrode mismatch. The AFE IC consists of two-stage CCIA that include three compensation loops (DSL, RRL, and CIBL) at each CCIA stage. The biopotential AFE is fabricated using a 0.18 μm one polysilicon and six metal layers (1P6M) complementary metal oxide semiconductor (CMOS) process. The core chip size of the AFE without input/output (I/O) pads is 10.5 mm2. A fourth-order band-pass filter (BPF) with a pass-band in the band-width from 1 Hz to 100 Hz was integrated to attenuate unwanted signal and noise. The overall gain and band-width are reconfigurable by using programmable capacitors. The IRN is measured to be 0.94 μVRMS in the pass band. The maximum amplifying gain of the pass-band was measured as 71.9 dB. The CIBL enhances the CMRR from 57.9 dB to 67 dB at 60 Hz under electrode mismatch conditions. View Full-Text
Keywords: biopotential; capacitively-coupled chopper instrumentation amplifier (CCIA); DC servo loop (DSL); ripple reduction loop (RRL); capacitive input boosting loop (CIBL) biopotential; capacitively-coupled chopper instrumentation amplifier (CCIA); DC servo loop (DSL); ripple reduction loop (RRL); capacitive input boosting loop (CIBL)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Song, H.; Park, Y.; Kim, H.; Ko, H. Fully Integrated Biopotential Acquisition Analog Front-End IC. Sensors 2015, 15, 25139-25156.

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