A Fully-Differential Biopotential Amplifier With a Reduced Number of Parts

Spinelli, Enrique Mario; Guerrero, Federico Nicolás; García, Pablo Andrés; Catacora, Valentín A.; Haberman, Marcelo

doi:10.1109/tim.2022.3220284

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…When CMOS- or JFET-based amplifiers are selected, the currents are of pA magnitude. Even with high impedances of tens of megaohms, the resulting voltages are very low, in the 10 µV scale, compared to electrode offset voltages that can be in the hundred-mV scale 74 . Furthermore, in ECG recording, the DC and very low baseline drifts are filtered out to avoid saturating the amplifier and complicating the interpretation 40 , 75 .…”

Section: Discussionmentioning

confidence: 99%

“…The result of electrode impedance mismatch is a reduced common-mode rejection ratio of the amplifier and ECG signal with some coupled common-mode signal, usually 50/60 Hz mains interference. This potential divider effect may be the major CMRR-lowering factor in dry electrode recordings with high and imbalanced impedances 74 . In the present study, the raw data were contaminated by common-mode signals at 10 Hz and 50 Hz, which was identified as sharp peaks in the power spectrum.…”

Section: Discussionmentioning

confidence: 99%

“…The noise results of the used amplifier and electrodes show that the amplifier has a negligible influence on the overall noise of the measurement. A high-quality amplifier is a strict requirement for ECG recordings to avert contaminating the data with noise 40 , 45 , 74 , 81 .…”

Section: Discussionmentioning

confidence: 99%

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ECG signal quality in intermittent long-term dry electrode recordings with controlled motion artifacts

Joutsen,

Cömert,

Kaappa

et al. 2024

Sci Rep

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Wearable long-term monitoring applications are becoming more and more popular in both the consumer and the medical market. In wearable ECG monitoring, the data quality depends on the properties of the electrodes and on how they interface with the skin. Dry electrodes do not require any action from the user. They usually do not irritate the skin, and they provide sufficiently high-quality data for ECG monitoring purposes during low-intensity user activity. We investigated prospective motion artifact–resistant dry electrode materials for wearable ECG monitoring. The tested materials were (1) porous: conductive polymer, conductive silver fabric; and (2) solid: stainless steel, silver, and platinum. ECG was acquired from test subjects in a 10-min continuous settling test and in a 48-h intermittent long-term test. In the settling test, the electrodes were stationary, whereas both stationary and controlled motion artifact tests were included in the long-term test. The signal-to-noise ratio (SNR) was used as the figure of merit to quantify the results. Skin–electrode interface impedance was measured to quantify its effect on the ECG, as well as to leverage the dry electrode ECG amplifier design. The SNR of all electrode types increased during the settling test. In the long-term test, the SNR was generally elevated further. The introduction of electrode movement reduced the SNR markedly. Solid electrodes had a higher SNR and lower skin–electrode impedance than porous electrodes. In the stationary testing, stainless steel showed the highest SNR, followed by platinum, silver, conductive polymer, and conductive fabric. In the movement testing, the order was platinum, stainless steel, silver, conductive polymer, and conductive fabric.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%