title: High gain driven right leg circuit for dry electrode systems.
abstract: This paper presents an improved driven right leg (DRL) circuit compensation together with a practical implementation. The proposed design allows to increase common mode voltage attenuation compared with the widely used dominant pole compensation while maintaining the same proven stability margin and design criteria, and requiring only a modification of its passive feedback network. A sample implementation of the proposed DRL was obtained estimating the values of interference model parameters for a dry electrode measurement system. A dominant pole compensated DRL with the same stability margin was also implemented in order to experimentally validate the proposed design against this established alternative. Measurements were conducted under both controlled and uncontrolled interference conditions. The proposed compensation experimentally demonstrated achieving a better reduction of power line harmonics, with a peak comparative improvement of around 18  dB at 50  Hz.
authors.affiliation: Electronics, Control, and Signal Processing Research Institute LEICI (CONICET-UNLP), 48 and 116 (CC 91 1900), La Plata, Buenos Aires, Argentina. Electronic address: federico.guerrero@ing.unlp.edu.ar.
authors.forename: Federico N
authors.initials: FN
authors.lastname: Guerrero
authors.affiliation: Electronics, Control, and Signal Processing Research Institute LEICI (CONICET-UNLP), 48 and 116 (CC 91 1900), La Plata, Buenos Aires, Argentina.
authors.forename: Enrique
authors.initials: E
authors.lastname: Spinelli
mesh_terms: D016477:Artifacts; D004553:Electric Conductivity; D004566:Electrodes; D005246:Feedback; D006801:Humans; D007866:Leg; D012815:Signal Processing, Computer-Assisted
keywords: Biopotential measurements; Body potential driving; DRL; Driven right leg; EMI; Electromagnetic interference