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**Harvard**

Macias, R., Seoane, F. och bragos, R. (2010) *Performance of the load-in-the-loop single Op-Amp voltage Controlled current source from the Op-Amp Parameters*.

** BibTeX **

@conference{

Macias2010,

author={Macias, Raul and Seoane, Fernando and bragos, Ramon},

title={Performance of the load-in-the-loop single Op-Amp voltage Controlled current source from the Op-Amp Parameters},

booktitle={Journal of Physics: Conference Serie},

pages={12008},

abstract={In recent years, Electrical Bioimpedance (EBI) methods have gained importance. These methods are often based on obtaining impedance spectrum in the range of β-dispersion, i.e. from a few kHz up to some MHz. To measure EBI a constant current is often injected and the voltage across the tissue under study is recorded. Due to the performance of the current source influences the performance of the entire system, in terms of frequency range, several designs have been implemented and studied. In this paper the basic structure of a Voltage-Controlled Current Source based on a single Op-Amp in inverter configuration with a floating load, known as load-in-the-loop current source, is revisited and studied deeply. We focus on the dependence of the output impedance with the circuit parameters, i.e. the feedback resistor and the inverter-input resistor, and the Op-Amp main parameters, i.e. open loop gain, CMRR and input impedance. After obtaining the experimental results, using modern Op-Amps, and comparing to the theoretical and simulated ones, they confirm the design under study can be a good solution for multi-frequency wideband EBI applications because of higher values of the output impedance than 100kΩ at 1MHz are obtained. Furthermore, an enhancement of the basic design, using a current conveyor as a first stage, is proposed, studied and implemented.},

year={2010},

keywords={Current Source, EBIS, spectroscopy},

}

** RefWorks **

RT Conference Proceedings

SR Electronic

ID 136034

A1 Macias, Raul

A1 Seoane, Fernando

A1 bragos, Ramon

T1 Performance of the load-in-the-loop single Op-Amp voltage Controlled current source from the Op-Amp Parameters

YR 2010

T2 Journal of Physics: Conference Serie

AB In recent years, Electrical Bioimpedance (EBI) methods have gained importance. These methods are often based on obtaining impedance spectrum in the range of β-dispersion, i.e. from a few kHz up to some MHz. To measure EBI a constant current is often injected and the voltage across the tissue under study is recorded. Due to the performance of the current source influences the performance of the entire system, in terms of frequency range, several designs have been implemented and studied. In this paper the basic structure of a Voltage-Controlled Current Source based on a single Op-Amp in inverter configuration with a floating load, known as load-in-the-loop current source, is revisited and studied deeply. We focus on the dependence of the output impedance with the circuit parameters, i.e. the feedback resistor and the inverter-input resistor, and the Op-Amp main parameters, i.e. open loop gain, CMRR and input impedance. After obtaining the experimental results, using modern Op-Amps, and comparing to the theoretical and simulated ones, they confirm the design under study can be a good solution for multi-frequency wideband EBI applications because of higher values of the output impedance than 100kΩ at 1MHz are obtained. Furthermore, an enhancement of the basic design, using a current conveyor as a first stage, is proposed, studied and implemented.

LA eng

LK http://iopscience.iop.org/1742-6596/224/1/012008/

OL 30