Hanen Nouri, Emna ben Ayed, D. Bouchaala, H. Derbel, O. Kanoun
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引用次数: 2
Abstract
Embedded bioimpedance devices are in high demand for the improvement of the healthcare systems. These devices require an accurate and stable current source with a high output impedance in the frequency range from 5 kHz to 1 MHz for a load range from 100 Ω to 10 kΩ. The output impedance should be higher than 10 MΩ at 5kHz and 1 MΩ at 1 MHz. In this paper, a comparison between the inverting single configuration and the inverting dual configuration of the Howland current source is discussed. For the evaluation of the circuit performances, two parameters are considered: resistor configurations and amplifier characteristics. The results shows that the inverting dual configuration using the operational amplifier AD8021 with a very high bandwidth has the highest output impedance values (higher than 1 MΩ at 1 MHz).
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