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Open AccessArticle

Circuit Topologies for MOS-Type Gas Sensor

Electronic Engineering Department, Universitat Politècnica de València, 46730 Gandia, Spain
Research Institute for Integrated Coastal Zone Management (IGIC Institute), Universitat Politècnica de València, Campus Gandia, 46730 Gandia, Spain
E.T.S.E, University of Valencia, Avda Universitat S/N, 46100 Burjassot, Valencia, Spain
Author to whom correspondence should be addressed.
Electronics 2020, 9(3), 525;
Received: 27 February 2020 / Revised: 18 March 2020 / Accepted: 21 March 2020 / Published: 23 March 2020
(This article belongs to the Section Circuit and Signal Processing)
Metal Oxide Semiconductor or MOS-type gas sensors are resistive sensors which can detect different reducible or volatile gases in atmospheres with oxygen. These gas sensors have been used in different areas such as food and drink industries or healthcare, among others. In this type of sensor, the resistance value changes when it detects certain types of gases. Due to the electrical characteristics, the sensors need a conditioning circuit to transform and acquire the data. Four different electronic topologies, two different MOS-type gas sensors, and different concentrations of a gas substance are presented and compared in this paper. The study and experimental analysis of the properties of each of the designed topology allows designers to make a choice of the best circuit for a specific application depending on the situation, considering the required power, noise, linearity, and number of sensors to be used. This study will give more freedom of choice, the more adequate electronic conditioning topology for different applications where MOS-type sensors are used, obtaining the best accuracy. View Full-Text
Keywords: electronic nose; sensor arrays; environmental analysis; Anderson loop; Wheatstone bridge electronic nose; sensor arrays; environmental analysis; Anderson loop; Wheatstone bridge
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Cervera Gómez, J.; Pelegri-Sebastia, J.; Lajara, R. Circuit Topologies for MOS-Type Gas Sensor. Electronics 2020, 9, 525.

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