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

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 s...

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Bibliographic Details
Main Authors: Coulombe, J., Rossel, O., Bernard, S., Soulier, F., Cathebras, G.
Format: Conference Proceeding
Language:English
Subjects:
Crosstalk
Electrodes
Engineering Sciences
Micro and nanotechnologies
Microelectronics
Noise
Noise reduction
Power demand
Transconductance
Transistors
Online Access:Request full text
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Summary: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.
ISSN:0271-4302
2158-1525
DOI:10.1109/ISCAS.2012.6272173