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

Jonathan Coulombe 1, * Olivier Rossel 1 Serge Bernard 1 Fabien Soulier 1, * Guy Cathébras 1
* Corresponding author
1 DEMAR - Artificial movement and gait restoration
LIRMM - Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier, CRISAM - Inria Sophia Antipolis - Méditerranée
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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https://hal-lirmm.ccsd.cnrs.fr/lirmm-00732253
Contributor : Fabien Soulier <>
Submitted on : Friday, September 14, 2012 - 11:54:24 AM
Last modification on : Wednesday, May 27, 2020 - 8:28:03 PM

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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'12: International Symposium on Circuits and Systems, South Korea. pp.846-849, ⟨10.1109/ISCAS.2012.6272173⟩. ⟨lirmm-00732253⟩

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