2002
DOI: 10.1007/bf02345453
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Two-electrode non-differential biopotential amplifier

Abstract: A circuit is proposed for a non-differential two-electrode biopotential amplifier, with a current source and a transimpedance amplifier as a potential equaliser for its inputs, fully emulating a differential amplifier. The principle of operation is that the current in the input of the transimpedance amplifier is sensed and made to flow with the same value in the other input. The circuit has a simple structure and uses a small number of components. The current source maintains balanced common-mode interference … Show more

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Cited by 8 publications
(9 citation statements)
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“…Holter systems, as current wearable monitoring devices, must be able to work in very aggressive interference environments. The knowledge of the EMI conditions that biopotential amplifiers can be subject to, is particularly important for designing these portable devices; in order to obtain interference-free biomedical signals [6] and to prevent amplifier saturation because of high EMI levels [2,4].…”
Section: Introductionmentioning
confidence: 99%
“…Holter systems, as current wearable monitoring devices, must be able to work in very aggressive interference environments. The knowledge of the EMI conditions that biopotential amplifiers can be subject to, is particularly important for designing these portable devices; in order to obtain interference-free biomedical signals [6] and to prevent amplifier saturation because of high EMI levels [2,4].…”
Section: Introductionmentioning
confidence: 99%
“…The moderately high differential input impedance of this amplifier would limit its application in cases where special, very high electrode-skin impedance electrodes are necessary and/or a high level of common mode interference has to be tolerated. In these cases, previously published designs are more convenient (DOBREV, 2002;2004;DOBREV and DASKALOV, 2002).…”
Section: V~n ~ Icmaz~ + Icmzcm/cmrrmentioning
confidence: 91%
“…A circuit for a two-electrode, non-differential amplifier was developed (DOBREV, 2002) quasi-equivalent to the differential amplifier described by DOBREV and DASKALOV (2002). Because the body as signal source is floating and, in addition, the modern biopotential amplifiers are isolated, it is possible to drive actively one of the electrodes to the circuit common potential and thus to balance the flowing interference currents.…”
Section: Introductionmentioning
confidence: 99%
“…The last requirement corresponds to interference level, which commonly occurs in a hospital room environment, according to our previous experience (DOBREV and DASKALOV, 2002;DOBREV, 2002). Even with a battery-supplied amplifier, input common mode currents can often reach 1.5 gA per input.…”
mentioning
confidence: 99%