This paper presents a miniaturized 2.5 GHz frequency source based on compensated BAW resonator with its integrated temperature molybdenum sensor assembled on the differential Colpitts oscillator. The presence of silicon dioxide layer having a positive temperature coefficient compared to other layers is used to reduce the resonator's drift. A demonstration oscillator achieves a frequency drift of 40 ppm over a temperature range from -35°C to +85°C. The oscillator's phase noise of -113 dBc/Hz at 10 kHz offset from the carrier is reported at 2.5 GHz.
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