Utmost OCXO solutions based on the IHR technology

The internally heated quartz resonators (IHR) for a long time had been an attractive solution for development of small size fast warming-up low power OCXOs. However in the frequency stability and phase-noise level they yielded noticeably to conventional OCXO designs based on the external oven structure. Along with complexity of the manufacturing process that restricted application of the IHR technology by the low and intermediate stability oscillators intended for portable battery supply devices. The present paper reports of creation of a new generation of the miniature low power OCXOs based on advanced IHR technology possessing excellent frequency stability and phase-noise parameters feasible heretofore only with high-end conventional OCXOs.