An oven controlled +/-1.6ppm stable 0.32mm3 FBAR based transformer coupled Colpitts oscillator

The first fully integrated oven-controlled temperature compensation system with the transformer coupled Colpitts oscillator is developed by 65nm CMOS tech. This work achieves ±1.55ppm frequency stability over the 85°C temperature range which can be used for the GPS application (<2ppm). An integrated heater in the FBAR chip consumes 14mW power at maximum. The temperature resolution of TDC is 150uK, sufficient to achieve an Allan deviation of 4ppb. This corresponds to a 1.68pJK2 FOM.

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