A simple and reproducible capacitive electrode

Medical Engineering & Physics
Enrique SpinelliMarcelo Haberman

Abstract

Capacitive Electrodes (CE) allow the acquisition of biopotentials through a dielectric layer, without the use of electrolytes, just by placing them on skin or clothing, but demands front-ends with ultra-high input impedances. This must be achieved while providing a path for bias currents, calling for ultra-high value resistors and special components and construction techniques. A simple CE that uses bootstrap techniques to avoid ultra-high value components and special materials is proposed. When electrodes are placed on the skin; that is, with coupling capacitances C(S) of around 100 pF, they present a noise level of 3.3 µV(RMS) in a 0.5-100 Hz bandwidth, which is appropriate for electrocardiography (ECG) measurements. Construction details of the CE and the complete circuit, including a fast recovery feature, are presented.

References

Sep 1, 1979·Medical & Biological Engineering & Computing·M E GriffithJ L Day
Apr 1, 1989·IEEE Transactions on Bio-medical Engineering·R Pallas-ArenyJ Rosell
Nov 1, 1972·Medical & Biological Engineering·R M David, W M Portnoy
Apr 3, 2010·Medical & Biological Engineering & Computing·Seung Min LeeKwang Suk Park
Sep 14, 2010·Physiological Measurement·Enrique Spinelli, Marcelo Haberman
Jan 1, 2010·IEEE Reviews in Biomedical Engineering·Yu Mike ChiGert Cauwenberghs
Jul 21, 2012·Physiological Measurement·Enrique SpinelliFederico Guerrero

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