The widely used sensitive elements of humidity sensors can be divided into 3 types, i.e., resistor, capacitor, and electrolyte. Humidity sensors consisted of these sensitive elements have corresponding signal processing circuit unique to each type of sensitive elements. This paper presents an ispPAC (in-system programmable Programmable Analog Circuit) -based humidity sensor signal processing circuit designed with software method and implemented with in-system programmable simulators. Practical operation shows that humidity sensor signal processing circuits of this kind, stable and reliable performance.
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