Interfacing the AD5933 for bio-impedance measurements with front ends providing galvanostatic or potentiostatic excitation

Cell Biometrics Based on Bio-Impedance Measurements

Many biological parameters and processes can be sensed and monitored using their impedance as marker (Grimmes, 2008), (Beach. 2005), (Yúfera, 2005), (Radke, 2004), with the advantage that it is a non-invasive, relatively cheap technique. Cell growth, cell activity, changes in cell composition, shapes or cell location are only some examples of processes which can be detected by microelectrode-ce...

Computer Simulation of Microelectrode based Bio-Impedance Measurements with COMSOL

Electrical models for microelectrode-cell interfaces are essential to match electrical simulations to real biosystems performance and correctly to decode the results obtained experimentally. The accurate response simulation of a microelectrode sensor to changes in the cell-electrode system, such as cell growth, enables the optimum microelectrode design process. We report the use of COMSOL quasi...

A planar micro-sensor for bio-impedance measurements

The outermost layer of the human skin, the stratum corneum (SC), is comprised of structurally inter-positioned anatomical regions. This inter-positioning renders the electrical characterization of its individual region difficult. To address this difficulty, the SC’s electrical properties at the cellular level were investigated. Impedance measurements were performed using a planar microelectrode...

Comparison of Howland and General Impedance Converter (GIC) circuit based current sources for bio-impedance measurements

The current source is a key component in bio-impedance measurement systems. The accuracy of the current source can be measured in terms of its output impedance together with other parameters, with certain applications demanding extremely high output impedance. This paper presents an investigation and comparison of different current source designs based on the Enhanced Howland circuit combined w...

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