Two-electrode low supply voltage electrocardiogram signal amplifier

Dobrev, Dobromir P.

doi:10.1007/bf02344642

Cited by 30 publications

(12 citation statements)

References 7 publications

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“…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: 92%

Simple two-electrode biosignal amplifier

Dobrev

Neycheva

Mudrov

2005

Med. Biol. Eng. Comput.

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A simple, cost effective circuit for a two-electrode non-differential biopotential amplifier is proposed. It uses a 'virtual ground' transimpedance amplifier and a parallel RC network for input common mode current equalisation, while the signal input impedance preserves its high value. With this innovative interface circuit, a simple non-inverting amplifier fully emulates high CMRR differential. The amplifier equivalent CMRR (typical range from 70-100 dB) is equal to the open loop gain of the operational amplifier used in the transimpedance interface stage. The circuit has very simple structure and utilises a small number of popular components. The amplifier is intended for use in various two-electrode applications, such as Holter-type monitors, defibrillators, ECG monitors, biotelemetry devices etc.

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Section: V~n ~ Icmaz~ + Icmzcm/cmrrmentioning

confidence: 92%

Simple two-electrode biosignal amplifier

Dobrev

Neycheva

Mudrov

2005

Med. Biol. Eng. Comput.

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“…The OPAMPs X a , X b and resistors R 1 and R 2 provide a theoretical gain of 1 + 2 R2 R1 [16]. For the common-mode signal control, the technique of reducing the AFE's input common-mode impedance seen by the human-body/electrodes interface was considered [17], [18]. The solution implemented in [17] is simple and low-cost, so our circuit was based on it.…”

Section: A the Input Stagementioning

confidence: 99%

A duty-cycle controlled variable-gain instrumentation amplifier applied for two-electrode ECG measurement

Antayhua

Silva

Sousa

2012

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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An instrumentation amplifier with variable gain suitable for biopotential signal acquisition is presented. The architecture proposed is based on the superregenerative receiver created by Armstrong back in the 1920's. It allows controlling the gain by the duty-cycle of a digital clock. This feature reduces the complexity for implementing an automatic gain control circuit, since no digital-to-analog converter is needed in the interface of the gain control. The implemented instrumentation amplifier provides a variable gain of 40.2 dB with a 0.5 dB gain-step resolution, plus a fixed gain of 28.2 dB, giving a total gain range of 68.2 dB dB. It was evaluated by acquiring ECG signals using only two electrodes installed on the body of a volunteer. Results show that the amplifier acquires the ECG signal and that it is capable of adapting its gain to a specified voltage amplitude for delivering it to an A/D converter.

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“…11), and a coarse ECG signal can be measured from them using a sensitive ECG amplifier. The ECG amplifier is based on a circuit presented in [22], and its output is low-pass filtered using a simple first degree 36 Hz RC-low-pass filter. The main amplifier board has also an amplifier for one Flexiforce 2 sensor, which could be used for measuring the weight of the person sitting on the chair.…”

Section: Wireless Implementationmentioning

confidence: 99%

An Electromechanical Film Sensor Based Wireless Ballistocardiographic Chair: Implementation and Performance

Junnila

Akhbardeh

Värri

2008

J Sign Process Syst Sign Image Video Technol

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New sensor technologies open possibilities for measuring traditional biosignals in new innovative ways. This, together with the development of signal processing systems and their increasing computing power, can sometimes give new life to old measurement techniques. Ballistocardiogram (BCG) is one such technique, originally promising but later replaced by the now very popular electrocardiogram. It's usability was previously limited by the large size of the devices required to record it, and the complex nature of the recorded signal, which gave little information in visual inspection. In this paper, we present how a lightweight and flexible electromechanical film (EMFi) sensor can be used to record BCG. A ballistocardiographic chair, designed to look like a normal office chair, was built and fitted with two sensitive EMFi sensors. Two different measurement setups to record the signal from the EMFi sensors were developed. The first, so-called wired setup, uses a commercial bio-amplifier, and a special pre-amplifier to interface to it. The latter, so-called wireless setup, uses our own hardware to transmit the recorded digitized signals wirelessly to a nearby PC.Both of these systems are presented and their performance evaluated. Also, the suitability, limitations and advantages of the EMFi sensor over existing sensors and methods are discussed. The validity of the EMFi sensor and amplifier output is tested using a mechanical vibrator. Lastly, a summary of signal analysis methods developed for our system is given. The developed systems have be used for medical BCG measurements, and the recordings indicate that the both the systems are functional and capture useful BCG signal components.

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Two-electrode low supply voltage electrocardiogram signal amplifier

Cited by 30 publications

References 7 publications

Simple two-electrode biosignal amplifier

Simple two-electrode biosignal amplifier

A duty-cycle controlled variable-gain instrumentation amplifier applied for two-electrode ECG measurement

An Electromechanical Film Sensor Based Wireless Ballistocardiographic Chair: Implementation and Performance

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