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http://dx.doi.org/10.5369/JSST.2017.26.5.342

A Low Noise Low Power Capacitive Instrument Amplifier for Bio-Potential Detection  

Park, Chang-Bum (Dept. of Electronics Engineering, Seokyeong University)
Jung, Jun-Mo (Dept. of Electronics Engineering, Seokyeong University)
Lim, Shin-Il (Dept. of Electronics Engineering, Seokyeong University)
Publication Information
Journal of Sensor Science and Technology / v.26, no.5, 2017 , pp. 342-347 More about this Journal
Abstract
We present a precision instrument amplifier (IA) designed for bio-potential acquisition. The proposed IA employs a capacitively coupled instrument amplifier (CCIA) structure to achieve a rail-to-rail input common-mode range and low gain error. A positive feedback loop is applied to boost the input impedance. Also, DC servo loop (DSL) with pseudo resistors is adopted to suppress electrode offset for bio-potential sensing. The proposed amplifier was designed in a $0.18{\mu}m$ CMOS technology with 1.8V supply voltage. Simulation results show the integrated noise of $1.276{\mu}Vrms$ in a frequency range from 0.01 Hz to 1 KHz, 65dB SNR, 118dB CMRR, and $58M{\Omega}$ input impedance respectively. The total current of IA is $38{\mu}A$. It occupies $740{\mu}m$ by $1300{\mu}m$ including the passive on-chip low pass filter.
Keywords
Instrument Amplifier; Bio-potential sensing; Sensor interfaces; CCIA;
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