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MOX gas sensors show a wide input resistance variation due to different employed materials, sensor ageing, and temperature variations, when encountering target gases. From the electronics point of view, a wide dynamic range readout interface is needed. The role of the interface is to accommodate the signal received by the sensor in order to be converted into digital or quasi-digital signal. This operation...
In biomedical engineering specifically gas sensing applications, the concentration of the exhaled gas is converted to a variation in resistance, thus an electronic integrated interface circuit is required to analyze the exhaled gases, which are indications for many diseases. In this paper, a differential resistance to current conversion circuit for Electronic nose (E-nose) breath analyzer is presented...
Due to their physical principle of operation, resistive gas sensors require very wide range interface circuit. Thus, to design the integrated read out solution, the accuracy in the converted data should be preserved. In this paper, a wide range resistance to current conversion circuit for gas sensing applications is designed. High linear current mirror in push pull configuration is implemented as...
This paper presents a study of Operational Transconductance Amplifiers (OTAs) for voltage to current conversion circuits. The paper includes a comparative analysis of three OTA architectures implemented in 0.35µm CMOS AMS Technology under ± 1.65V power supply voltage. The impact of the OTA topology has been investigated by simulation. The designed OTAs managed to deliver large current values of 10mA...
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...
Background Coronary artery disease (CAD) is the major leading cause of death worldwide. The national practice guidelines from the American College of Cardiology (ACC) and American Heart Association (AHA) promote the use of several medical therapies for secondary prevention for patients with CAD. The purpose of this study was to evaluate whether ACS patients, admitted into two tertiary referral medical...
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