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

Low power and low noise RF frequency reference is essential for radio system. Radio standards require reference frequency to be stable over a wide range of temperatures (-40 to 110°C for industrial). The state of the art radio architecture used temperature compensated resonator (ZDR), but the stability is not enough to meet the most stringent spec. for GPS application (<;2ppm). The solution is here exploiting to heat and monitor the resonator temperature simultaneously.