Piezoelectric Non Linear Nanomechanical Temperature and Acceleration Insensitive Clocks (PENNTAC)
Technical Report,20 Aug 2012,20 Mar 2016
Carnegie Mellon University Pittsburg United States
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Besides the phase noise PN requirement in wireless applications such as Wi-Fi, Bluetooth, and GPS, frequency stability under temperature change is also a very important specification that needs to be satisfied. Although the introduced oscillator using microelectromechanical systems MEMS based resonator helps to lower PN and achieve high figure of merit compared to other state-of-the art oscillators, the resonator is the main contributor for frequency variation according to the temperature change. The work accomplished during this effort demonstrated the first fully integrated oven control system to mitigate the temperature effect on the reference clock. It showed low frequency drift 1.5ppm with the highest resolution sensor 150uK, which meets the most stringent requirement for GPS application. As this system does not require any calibration on the MEMS resonator because of its feedback structure, there is benefit from its characteristics of short test time and time-to-market. It can also lead to lower cost from the product perspective.