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Title: A compact, low input capacitance neural recording amplifier
Authors: Ng, K.A.
Xu, Y.P. 
Keywords: Biopotential amplifier
Input impedance
Neural recording
Issue Date: 2013
Citation: Ng, K.A., Xu, Y.P. (2013). A compact, low input capacitance neural recording amplifier. IEEE Transactions on Biomedical Circuits and Systems 7 (5) : 610-620. ScholarBank@NUS Repository.
Abstract: Conventional capacitively coupled neural recording amplifiers often present a large input load capacitance to the neural signal source and hence take up large circuit area. They suffer due to the unavoidable trade-off between the input capacitance and chip area versus the amplifier gain. In this work, this trade-off is relaxed by replacing the single feedback capacitor with a clamped T-capacitor network. With this simple modification, the proposed amplifier can achieve the same mid-band gain with less input capacitance, resulting in a higher input impedance and a smaller silicon area. Prototype neural recording amplifiers based on this proposal were fabricated in 0.35 μm CMOS, and their performance is reported. The amplifiers occupy smaller area and have lower input loading capacitance compared to conventional neural amplifiers. One of the proposed amplifiers occupies merely 0.056 mm2. It achieves 38.1-dB mid-band gain with 1.6 pF input capacitance, and hence has an effective feedback capacitance of 20 fF. Consuming 6 μ W, it has an input referred noise of 13.3 μ Vrms over 8.5 kHz bandwidth and NEF of 7.87. In-vivo recordings from animal experiments are also demonstrated. © 2007-2012 IEEE.
Source Title: IEEE Transactions on Biomedical Circuits and Systems
ISSN: 19324545
DOI: 10.1109/TBCAS.2013.2280066
Appears in Collections:Staff Publications

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