Abstract
Multi-channel biosignal recording systems that employ a shared-reference scheme and achieve high common-mode rejection ratio (i.e., CMRR > 80dB) have been reported in recent works. While it is well-understood that a shared-reference scheme causes impedance mismatch at the input terminals of bioamplifier, and thus limits the maximum achievable CMRR, a theoretical study that can provide quantitative assessment of this source of degradation is still lacking. This brief provides an equivalent electrical circuit model of the input interface consisting of an electrode array and bioamplifiers, followed by a complete analysis to formulate the CMRR degradation. Simulation results based on a previously designed and fabricated 32-channel neural recording front-end in a 180nm CMOS process are presented, exhibiting close agreement with the theory.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEEE Transactions on Circuits and Systems II: Express Briefs
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
