Abstract
A low-power low-noise capacitively-coupled chopper instrumentation amplifier (CCIA) using stacked transconductance amplifiers (OTAs) for bio-potential sensing is presented. It utilizes stacked OTAs as the first stage for noise and power efficiency optimization. A DC servo loop is added to eliminate the DC electrode offset, and pseudo-resistors are designed to realize high-pass filters with ultra-low cut-off frequency without using large capacitors. The CCIA was designed in a 28nm CMOS process, occupying a chip area of 0.15mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . It consumes 0.65μA current under 1-V supply. Simulation results indicate that the input-referred noise is 70nV/rtHz and the noise efficiency factor is 2.7.
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