Bioamplifier using active electrodes

The specialized bioamplifier for active electrode applications is presented in this paper. Our device presents 4 channeled bioamplifier with option to connect 3 couples of active electrodes and one couple of standard electrodes. The measured signal processing and digitalization are based on the ADS1194 chip by Texas Instruments. The graphical user interface is also presented in this article. The end of the article is focused on the measurement of electrocardiogram and electromyogram to prove the ability of the prototype to measure bioelectrical signals. The article also shows the simple design of active electrode for capacitive coupled sensing with integrated ultralow input bias current operational amplifier LMP7721 in configuration as voltage buffer.