Abstract

GUERRERO, Federico N; HABERMAN, Marcelo  and  SPINELLI, Enrique. MULTICHANNEL BIOPOTENTIAL ACQUISITION SYSTEM. Rev. ing. biomed. [online]. 2014, vol.8, n.15, pp.18-26. ISSN 1909-9762.

A biopotential measurement system composed of acquisition hardware and software capable of relaying real-time signals to a PC is presented. The device has 8 DC coupled differential channels sampled by 24 bits sigma-delta analog to digital converters with programmable gain and sampling frequency. The noise floor of the device determines its resolution, and it is less than 2 µV_rms in a bandwidth of (0.05-100) Hz. Measurements up to 1 kHz can be carried out with a noise voltage less than 3 µV_rms. The common mode rejection ratio is 96 dB. To achieve high-quality measurements active electrodes are used along with a common mode voltage reduction circuit allowing single-ended measurement topologies. A USB connection serves both as data channel and power source. The device includes an isolation barrier in agreement with international standards for the electrical safety of medical equipment. Its frequency response was measured and compared with accepted standards for electrocardiographic devices, and various biopotential measurements were carried out in order to test both hardware and software.

Keywords : Biopotential acquisition; Interference rejection; Sigma delta converters; Multichannel measurement; Patient isolation; ECG; EMG; EEG; ADS1298.

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