Two-electrode biopotential amplifier with current-driven inputs

Dobrev, Dobromir P.; Daskalov, И.

doi:10.1007/bf02347705

Cited by 27 publications

(19 citation statements)

References 10 publications

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“…Another sample of the signal, after being filtered by a 4th-order BPF (V 1 ) with 30 Hz bandwidth (which allows only the EMI components between 40 and 70 Hz to pass), passes through the A/D converter implemented in the PIC16F877 microcontroller (with an 8-bit data bus, 4 MHz clock, 2400 bps processing capacity, and a 19.53 mV resolution). This is what distinguishes this prototype from those submitted in earlier works (Dobrev and Daskalov, 2002;Negrão et al, 2006;Spnelli et al, 2004): the analysis of noise (V cm ), separated from the useful signal (V d ).…”

Section: Circuit Modelingmentioning

confidence: 64%

Electromagnetic interference reduction by dynamic impedance balancing applied to biosensors

Negrão

Araujo

Júnior

et al. 2013

RBEB

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Section: Circuit Modelingmentioning

confidence: 64%

Electromagnetic interference reduction by dynamic impedance balancing applied to biosensors

Negrão

Araujo

Júnior

et al. 2013

RBEB

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“…7a of DOBREV and DASKALOV (2002) The high value of the resistor between the amplifier input and the current source keeps possible auxiliary patient current below the safety standard limits. The circuit can accept high-value input filter resistances, which can also be a security measure against possible fault conditions.…”

Section: Practical Amplifier Circuitmentioning

confidence: 99%

Two-electrode non-differential biopotential amplifier

Dobrev

2002

Med. Biol. Eng. Comput.

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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 currents, thus ensuring high signal input impedance. In addition, these currents can be tolerated up to more than 10 microA per input, at a supply voltage of +/- 5 V. A two-electrode differential amplifier with 2 x 10 Mohm input resistances to the reference point allows less than 0.5 microA per input. The circuit can be useful in cases of biosignal acquisition by portable instruments, using low supply voltages, from subjects in areas of high electromagnetic fields. Examples include biosignal recordings in electric power stations and electrically powered locomotives, where traditionally designed input amplifier stages can be saturated.

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“…For normal condition, if the imbalance of electrode-electrolyte impedance is in the worst case, then the impedances Rd||Cd for two recording electrodes are 2 KO||20 nF and 500 O ||100 nF respectively [9].…”

Section: Appendix Typical Valuesmentioning

confidence: 99%

Spice Model for Computer-Aided Design of Biopotential Amplifier

Liu

Lin

2004

Biomed. Eng. Appl. Basis Commun.

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There are many different kinds of biopotential signal. These signals are tiny in amplitude and the measurement is easily corrupted by external interference. For these reasons, the design of high-quality biopotential amplifier is usually an empirical task. To make the design of biopotential amplifier more efficient, this study proposes a simulation model for bioelectric signal measurement such that the design task can be achieved thoroughly by powerful computer-aided design (CAD) tool. The proposed model has two distinct features, one is the simulated biopotential signal is used for the genesis of biosignal, and the other one is the skin-electrode impedance is replaced by its corresponding equivalent circuit, which is a complex RC network. To verify the feasibility of the proposed model, an ECG amplifier is designed in Spice-related CAD tool and is implemented for ECG recording. From the results, the amplifier characteristics agree well between the simulated and the implemented circuit. Besides, the effect due to the commonly encountered power-line interference during biopotential measurement can be reasonably evaluated in the proposed model.

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Two-electrode biopotential amplifier with current-driven inputs

Cited by 27 publications

References 10 publications

Electromagnetic interference reduction by dynamic impedance balancing applied to biosensors

Electromagnetic interference reduction by dynamic impedance balancing applied to biosensors

Two-electrode non-differential biopotential amplifier

Spice Model for Computer-Aided Design of Biopotential Amplifier

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