Method of recording bioelectrical signals using a capacitive coupling

In this article a technique for the bioelectrical signals acquisition by means of the capacitive sensors is described. A feedback loop for the ultra-high impedance biasing of the input instrumentation amplifier, which provides receiving of the electrical cardiac signal (ECS) through a capacitive cou...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-11, Vol.929 (1), p.12016
Main Authors: Simon, V A, Gerasimov, V A, Kostrin, D K, Selivanov, L M, Uhov, A A
Format: Article
Language:English
Subjects:
Analog to digital conversion
Analog to digital converters
Bandstop filters
Bioelectricity
Coupling
Data buses
Feedback loops
High impedance
Personal computers
Physics
Q factors
Signal processing
Universal Serial Bus
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Summary:In this article a technique for the bioelectrical signals acquisition by means of the capacitive sensors is described. A feedback loop for the ultra-high impedance biasing of the input instrumentation amplifier, which provides receiving of the electrical cardiac signal (ECS) through a capacitive coupling, is proposed. The mains 50/60 Hz noise is suppressed by a narrow-band stop filter with an independent notch frequency and quality factor tuning. Filter output is attached to a ΣΔ analog-to-digital converter (ADC), which acquires the filtered signal with a 24-bit resolution. Signal processing board is connected through universal serial bus interface to a personal computer, where ECS in a digital form is recorded and processed.
ISSN:1742-6588
1742-6596
1742-6596
DOI:10.1088/1742-6596/929/1/012016