Abstract:In this paper, a new switched-capacitor (SC) interface circuit for humidity sensor application is proposed. The sensing principle makes use of the difference between the thermal conductivity of air and water vapor at elevated temperatures. It causes a voltage difference between two isolated diodes. The reference diode is sealed and has a fixed thermal conductance, while the sensing diode is exposed to the environment having a humidity-dependent thermal conductance. The exposed diode is connected to the propose… Show more
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