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A complete gas-sensing system for portable ambient monitoring purpose, consisting of a sensor (with embedded heater and thermometer) and an integrated interface (with read-out channel and closed-loop temperature control circuit) is presented. The micromachined sol-gel tin-oxide sensor features a 450 nm thick silicon nitride/oxide membrane, an active area of 170 mum times 170 mum and a power consumption...
This paper presents a complete gas-sensing chip. It consists of a high-efficiency temperature control loop with a switching power stage and digital set-point and of a wide-dynamic-range interface circuit able to operate without calibration. Measurements results show that the controlled temperature of the sensor over a range of 250degC exhibits an accuracy better than 1.5degC with a maximum peak-to-peak...
This paper presents a complete gas-sensing system. The latter consists of a high-efficiency temperature control loop with a switching heater based on a custom digital control logic and of a wide-dynamic-range interface circuit able to operate without calibration. The temperature control loop is driven by a digital set-point and the simulations results show that it controls the temperature of the sensor...
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