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Resistive chemical sensors, such as metal oxide (MOX) devices, usually exhibit resistance values within a wide range, from tens of kilohms to tens of gigohms. Electronic interfaces based on the resistance-to-time conversion (RTC) technique are widely used to handle such sensors, thanks to the low-cost, low-noise and wide-range characteristics. The main limit of the RTC-based schemes is the variable...
The main issue concerning metal oxide (MOX) gas sensors is mostly related to the wide range of resistive values the sensors can show. In addition, some sensors could have baseline resistive value up to tens of gigohms. To avoid the use of expensive pico-amperometers, different solutions have been recently proposed, exploiting the resistance-to-time conversion (RTC) technique. They show good linearity...
In this paper a novel and simple CMOS integrated interface is presented. The circuit is suitable for typical gas sensor applications being able to reveal: a) high resistive values over a wide-range (more than five orders of magnitude, ranging from hundreds of kilohm up to tens of gigohm); b) relatively low value capacitances (few picofarad) and their variations. The proposed front-end utilizes, as...
A new oscillating circuit is proposed to estimate the resistance and parallel parasitic capacitance of resistive chemical sensors. The circuit is able to reveal the resistance in a wide range (from tens of kiloohms to more than 100 GOmega) due to the adopted resistance-to-time technique. In addition, the parallel capacitance (up to 50 pF) can be estimated. The circuit, which does not need any initial...
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