High accuracy resistance to current circuit design for resistive gas sensor biomedical applications

In biomedical engineering specifically in the branch of breathe analysis, the concentration of the gas in the breath is converted to a variation in resistance, such that each gas molecule is represented by a value of resistance. The array of resistive gas sensors analyze the gases released in breathe which are indications for many diseases. The resistance value is then converted to a current signal for further analysis. Therefore, these information have to be processed paying attention to the accuracy of the converted data. In this paper, accuracy analysis of resistance to current conversion circuit is presented. Results show a maximum percentage error of 0.27% and a minimum value of zero.