Combination of FEM/Harmonic Balance analysis of OCXO

Combination of FEM for thermal analysis and Harmonic Balance oscillation analysis can achieve the highly frequency/temperature stable OCXO such as a few parts per billion frequency/temperature performance for the wide temperature range by simple single oven. This design method basically has been applied to the new OCXO for the LTE(Long Term Evolution)base-station of the next generation of the mobile communication network.