The widest deployment of wireless sensors may take advantage from the integration of an antenna realized directly on chip [1], [2].In this paper a new wireless temperature sensor made with a standard 0.8 μm VLSI process, with an on-chip antenna, is presented. An on-chip antenna allows the elimination of external components, which are usually placed on an additional PCB. As a result, extreme system miniaturization is obtained. On the other hand, system efficiency is degraded by the antenna low Q factor in the practical transmission frequency ranges.The realised chip includes a 3-stage ring oscillator structure which transforms the silicon substrate temperature variation into a frequency modulation. The signal is transmitted by a small loop antenna structure which is realized by aluminium deposition on the top surface of the chip. The antenna is connected between the input and output pins of the ring oscillator.
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