A Two-Wired Ultra-High Input Impedance Active Electrode
| Autor: | Federico Nicolás Guerrero, Enrique Mario Spinelli |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
0206 medical engineering Biomedical Engineering INGENIERÍAS Y TECNOLOGÍAS 02 engineering and technology Electric Capacitance Capacitance law.invention Common-mode rejection ratio DRY-CONTACT ELECTRODES law 0202 electrical engineering electronic engineering information engineering Electronic engineering Humans Output impedance Ingeniería Eléctrica y Electrónica Electrical and Electronic Engineering Electrodes Electrical impedance Ingeniería Eléctrica Ingeniería Electrónica e Ingeniería de la Información BIOPOTENTIAL MEASUREMENTS Amplifiers Electronic Electrodiagnosis 020208 electrical & electronic engineering Voltage divider Buffer amplifier Signal Processing Computer-Assisted Equipment Design Input impedance 020601 biomedical engineering ACTIVE ELECTRODES POWER SUPPLY BOOTSTRAPPING Operational amplifier TWO-WIRED BUFFER |
| Zdroj: | IEEE Transactions on Biomedical Circuits and Systems. 12:437-445 |
| ISSN: | 1940-9990 1932-4545 |
| Popis: | This paper presents a novel two-wired active electrode that achieves ultrahigh input impedance using power supply bootstrapping. The proposed circuit reduces the input capacitance of a buffer amplifier while enabling measurements using leads with only two wires, providing a low-complexity and low-cost solution for interference rejection and artifact reduction in dc-coupled dry-contact biopotential measurements. An implemented prototype shows that, even using standard operational amplifiers, an input capacitance as low as 71 fF can be obtained, maintaining a high impedance in a 0-1 kHz bandwidth, sufficient for ECG, EEG, and EMG measurements. The circuit has a simple and easily replicable implementation that requires no individual adjustment. A common mode rejection ratio (CMRR) above 103 dB at 50 Hz was achieved and the increased rejection to interference due to the potential divider effect was experimentally tested maintaining a 92-dB CMRR at 50 Hz with a 1.2-M Ω source impedance unbalance. ECG measurements were conducted to validate the active electrode against a traditional alternative, and a test with dry-contact EEG electrodes was successfully conducted. Although the proposed circuit is intended to acquire superficial electrophysiological signals using dry electrodes, it can be used for measurement from other high-impedance sources, such as micropipette electrodes. Fil: Guerrero, Federico Nicolas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales. Universidad Nacional de La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales; Argentina Fil: Spinelli, Enrique Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales. Universidad Nacional de La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales; Argentina |
| Databáze: | OpenAIRE |
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