Non-contact Biopotential Amplifier with Capacitive Driven Right Leg Circuit

In this paper, the development and measurement results of active capacitive electrodes are presented. A brief overview and implementation of a capacitive driven right leg circuit (CDRL) for biopotential measurements are given. The obtained results showed the feasibility of the developed system for capacitive measurement of ECG signal. When CDRL is used, the common-mode rejection was reduced up to 11.3 dB compared to the case with no CDLR. Finally, the results of filtering in the digital domain on the acquired signals are presented in time and frequency domains.