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Conference Papers Year : 2012

A new shared-input amplifier architecture with enhanced noise-power efficiency for parallel biosignal recordings

Abstract

A method for enhancing the noise-power tradeoff of front-end amplifiers in parallel recording applications is proposed. The circuit uses shared-input transconductance amplifiers and differential readout to attenuate correlated noise between parallel outputs, resulting in significant supply current savings without noise penalty. Also, a method for reducing the remaining noise with little power penalty is proposed. The potential benefits of combining both methods and the related trade-offs are discussed and validated by simulations on a sample design intended for ENG recordings, using models of a 0.35µm BiCMOS process. It is shown that the total supply current can be reduced by more than 50% that of a comparable system using conventional differential amplifiers with equivalent output noise. Alternatively, the noise can be reduced by approximately 35% with comparable power consumption.
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lirmm-00732253 , version 1 (14-09-2012)

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Jonathan Coulombe, Olivier Rossel, Serge Bernard, Fabien Soulier, Guy Cathébras. A new shared-input amplifier architecture with enhanced noise-power efficiency for parallel biosignal recordings. ISCAS 2012 - International Symposium on Circuits and Systems, May 2012, Seoul, South Korea. pp.846-849, ⟨10.1109/ISCAS.2012.6272173⟩. ⟨lirmm-00732253⟩
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