Abstract
Recording electrical activities through high-density electrodes using neural amplifiers plays a crucial role in the successful implementation of a data acquisition system targeting deep-brain regions. To advance the concept of high-density electrodes, neural amplifiers with not only minimum area but also high-power efficiency are needed. This letter presents a neural recording chopper amplifier using the auxiliary path and gain revision techniques to boost the input impedance to a dc value of 6.7 GΩ that meets the requirements of an implantable multichannel recording system. The front-end fabricated in 180-nm CMOS technology occupies an area of 0.051 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , and consumes a total power consumption of 2.1 μW drawn from a 1-V supply. The proposed work increases the dc input impedance ( 18×) and decreases the area by 25% in comparison with conventional auxiliary path impedance boosting with a CMRR of -75 dB, and the input-referred noise of 2.1 μV <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> rms</sub> .
Published Version
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