The performance of integrated transconductance amplifiers as variable current sources for bio-electric impedance measurements

Smith, Dorothy

doi:10.1088/0143-0815/13/a/005

Cited by 2 publications

(1 citation statement)

References 1 publication

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“…The described design method is applicable to adjacent or d i a m e ~c drive or to any other method that involves the use of a pair of electrodes that inject currents of equal amplitudes and opposite phases. A range of techniques can be used in EIT to drive the electrodes (Lidgey et a1 1990, 1992, Smith 1992, Sansen et al 1992. Although the Howland circuit is used in the present study, any other system capable of delivering constant output current could have been used.…”

Section: Theorymentioning

confidence: 99%

Active current electrodes for in vivo electrical impedance tomography

Jossinet¹,

Tourtel²,

Jarry³

1994

Physiol. Meas.

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The characterization of tissue by means of electrical impedance tomography requires accurate impedance measurements at relatively high frequencies. The present study describes the design and fabrication of broad-band, active, current electrodes for in vivo measurements. This approach eliminates the lead capacitances of the sourcing electrodes. The value of the resistors used were computed according to a protocol taking into account the constraints of a given application and the values and tolerances of the available components. Additional selection of the components further reduced the variability in circuit performance. The current sources designed according to the method described are usable at frequencies higher than 1 MHz, for differential load impedances up to 2000 omega. The parallel output conductance for each active electrode is 0.85 microS +/- 2%. The design method is valid for either adjacent or diametric drive, and can be applied to various applications by modifying the shape of the electrode.

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Section: Theorymentioning

confidence: 99%

Active current electrodes for in vivo electrical impedance tomography

Jossinet¹,

Tourtel²,

Jarry³

1994

Physiol. Meas.

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Open and Collaborative Dataset for the Classification of Operational Transconductance Amplifiers for Switched-Capacitor Applications

Gagliardi,

Dei

2024

Data

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This study introduces a collaborative and open dataset designed to classify operational transconductance amplifiers (OTAs) in switched-capacitor applications. The dataset comprises a diverse collection of OTA designs sourced from the literature, facilitating benchmarking, analysis and innovation in analog and mixed-signal integrated circuit design. Various evaluation methodologies, implemented through a companion Python notebook script, are discussed to assess OTA performances across different operating conditions and specifications. Several Figures of Merit (FoMs) are utilized as performance metrics to achieve significant performance classification. This study also uncovers intriguing behaviors and correlations among FoMs, providing valuable insights into OTA design considerations. By making the dataset openly available on platforms like GitHub, this work encourages collaboration and knowledge sharing within the integrated circuit design community, thereby enhancing transparency, reproducibility and innovation in OTA design research.

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The performance of integrated transconductance amplifiers as variable current sources for bio-electric impedance measurements

Cited by 2 publications

References 1 publication

Active current electrodes for in vivo electrical impedance tomography

Active current electrodes for in vivo electrical impedance tomography

Open and Collaborative Dataset for the Classification of Operational Transconductance Amplifiers for Switched-Capacitor Applications

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