A pressure transducer is presented which embodies a piezoresistive sensor manufactured in thick-film technology (TFT) on an insulated steel diaphragm, coupled to a purposely designed signal conditionig circuit. This is based on a relaxation oscillator whose output frequency is related to the input pressure, while the duty-cycle is controlled by a thermoresistor included in the sensing head for thermal compensation purposes. The design of the sensor and the electronics is presented and results are reported on the experimental characterization of the prototype.
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