Patent ID: 6534767
Filing Date: 2003-03-18
Classification: G01K

Abstract:
A temperature sensor comprising an inductor and a ferroelectric capacitor connected as a resonant circuit, the resonant circuit having a resonant frequency dependent on the temperature of the capacitor, the capacitor comprising:a substrate having a window; a membrane formed on the substrate, over the window; a lower split electrode formed on the membrane and comprising first and second electrode pieces electrically separated by a split over the window, the first electrode piece comprising a first capacitor plate portion adjacent the split, a first contacting portion, and a first linking portion connecting the first capacitor plate portion to the first contacting portion, the second electrode piece comprising a second capacitor plate portion adjacent the split, a second contacting portion, and a second linking portion connecting the second capacitor plate portion to the second contacting portion; a ferroelectric layer formed over the first and second capacitor plate portions and the split but not over the first and second linking portions; and an upper contactless electrode formed on the ferroelectric layer.