Phase noise in capacitively coupled micro-resonator-based oscillators is investigated. A detailed analysis of noise mixing mechanisms in the resonator is presented, and the capacitive transduction is shown to be the dominant mechanism for low-frequency 1/f-noise mixing into the carrier sidebands. Thus, the capacitively coupled micromechanical resonators are expected to be more prone to the 1/f-noise aliasing than piezoelectrically coupled resonators. The analytical work is complemented with simulations, and a highly efficient and accurate simulation method for a quantitative noise analysis in closed-loop oscillator applications is presented. Measured phase noise for a microresonator-based oscillator is found to agree with the developed analytical and simulated noise models.
|Pages (from-to)||2322 - 2331|
|Number of pages||10|
|Journal||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control|
|Publication status||Published - 2005|
|MoE publication type||A1 Journal article-refereed|
Kaajakari, V., Koskinen, J. K., & Mattila, T. (2005). Phase noise in capacitively coupled micromechanical oscillators. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 52(12), 2322 - 2331. https://doi.org/10.1109/TUFFC.2005.1563277