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Low power current sources for bioimpedance measurements: a comparison between Howland and OTA-based CMOS circuits Cover

Low power current sources for bioimpedance measurements: a comparison between Howland and OTA-based CMOS circuits

Journal of Electrical Bioimpedance
Volume 3 (2012): Issue 1 (January 2012)
By: Pedro Bertemes-Filho,  Volney C. Vincence,  Marcio M. Santos and  Ilson X. Zanatta  
Open Access
|Oct 2012

Figures & Tables

Fig.1

Schematic diagram of the simulated mirrored modified Howland current source, where R= 47 kΩ, C= 2 μF and Vin is the input signal.
Schematic diagram of the simulated mirrored modified Howland current source, where R= 47 kΩ, C= 2 μF and Vin is the input signal.

Fig.2

Schematic diagram of the simulated CMOS class-A operational transconductance amplifier (modified from (42)).
Schematic diagram of the simulated CMOS class-A operational transconductance amplifier (modified from (42)).

Fig.3

Schematic diagram of the simulated CMOS class-AB operational transconductance amplifier (modified from (40)).
Schematic diagram of the simulated CMOS class-AB operational transconductance amplifier (modified from (40)).

Fig.4

Schematic diagram of the Current Conveyor current source.
Schematic diagram of the Current Conveyor current source.

Fig.5

Linearity error response of the current source over the input voltage range -0.6 to +0.6 V, using a resistive load of 1 kΩ.
Linearity error response of the current source over the input voltage range -0.6 to +0.6 V, using a resistive load of 1 kΩ.

Fig.6

Harmonic distortion as a function of the input voltage.
Harmonic distortion as a function of the input voltage.

Fig.7

Output current magnitude over the frequency range 10 Hz to 1 GHz.
Output current magnitude over the frequency range 10 Hz to 1 GHz.

Fig.8

Output impedance over the frequency range 10 Hz to 100 MHz.
Output impedance over the frequency range 10 Hz to 100 MHz.
DOI: https://doi.org/10.5617/jeb.380 | Journal eISSN: 1891-5469
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Language: English
Page range: 66 - 73
Submitted on: Jun 29, 2012
Published on: Oct 23, 2012
Published by: University of Oslo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
Howland circuit,
OTA,
current conveyor,
bioimpedance
Related subjects:
Engineering,
Bioengineering and biomedical engineering,
Biomedical electronics,
Life sciences,
Biophysics,
Medicine,
Biomedical engineering,
Physics,
Spectroscopy and metrology

© 2012 Pedro Bertemes-Filho, Volney C. Vincence, Marcio M. Santos, Ilson X. Zanatta, published by University of Oslo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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