Key result
Novel capacitive driven right leg circuit achieves up to ~80 dB gain to reduce common-mode voltage.
Why the study?
Capacitive electrodes for biopotential acquisition are vulnerable to electric-field interference, especially common mode voltages from 50 Hz power-line, requiring improved circuit design.
The proposed Capacitive Driven Right Leg circuit provides stable, high-quality biopotential recordings (such as ECG) by reducing common mode voltage interference without requiring electrolytes.
Answers are grounded in this paper and cite their sources.
CDRL may reduce 50 Hz interference in capacitive biopotential recording; leaves open clinical validation before routine use.
Capacitive electrodes allow to pick–up biopotentials through a dielectric layer, without using electrolytes. However, this technique is vulnerable to electric–field interference, mainly to common mode voltages produced by the 50 Hz power–line. A fully Capacitive Driven Right Leg (CDRL) circuit is proposed to reduce the patient common mode voltage vCM. The design of this circuit takes into account several factors as electrode impedance, stray coupling capacitances and amplifier transfer function response. All these parameters are addressed to ensure the circuit's stability in most biopotential acquisition scenarios. Monte Carlo analyses were performed to find the worst conditions, resulting in a maximum CDRL gain between 70 and 80 dB. The CDRL was implemented as an independent block that can be used for different applications such as ECG, EMG or EEG. Several experimental results are presented, showing good quality recordings even using SE amplifiers, an appropriate approach for multichannel acquisition systems.
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Haberman et al. (2015) studied this question. Capacitive Driven Right Leg (CDRL) circuit was evaluated on Reduction of patient common mode voltage and circuit stability. A fully Capacitive Driven Right Leg (CDRL) circuit was designed to reduce patient common mode voltage, achieving a maximum CDRL gain between 70 and 80 dB in Monte Carlo analyses.
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