Design and evaluation of a capacitively coupled sensor readout circuit, toward contact-less ECG and EEG
2010 (English)In: IEEE Biomedical Circuits and Systems Conference, Paphos, Cyprus: IEEE , 2010, 302-305 p.Conference paper (Refereed)
Electrophysiological signal acquisition such as ECG and EEG play an important part in modern medical monitoring and diagnostics. The measurement of these very low-level, low-frequency signals are normally made from the skin with a directly coupled sensor utilizing a conductive gel to create a low resistance path for the charge. The application of the gel is tedious and time consuming as well as requiring a clinical environment and prevents long period measurements. In this paper, a contact-less, capacitively coupled sensor — without any need for gel — together with an electronic readout circuit using a PCB is presented. A design with a very high input impedance allows for measurements of signals with amplitudes down to a few tens of microvolts and at frequencies between a few hertz to tens of hertz. Measurements show that the circuit could detect an input signal of 25 μV at 10 Hz with an SNR of 9.7 dB.
Place, publisher, year, edition, pages
Paphos, Cyprus: IEEE , 2010. 302-305 p.
Biomedical signal detection, Biomedical transducers, Electrocardiography, Electroencephalograhpy
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-65471DOI: 10.1109/BIOCAS.2010.5709631ISBN: 978-1-4244-7269-7OAI: oai:DiVA.org:liu-65471DiVA: diva2:395858