Recent achievements in performance of 100 MHz crystals and OCXOs

Abstract

In recent years low noisy precision 100 MHz oscillators for continuous operation up to 15 years became more and more important for modern telecommunication and measurement equipment. Often it is important to minimize both close-in phase noise (at 10, 100 and 1000 Hz from carrier) and noise floor (at 10, 100 and 1000 kHz from carrier). Requirements became tougher not only for phase noises and various kinds of frequency stabilities, but also for OCXOs' reliability. To meet modern requirements for 100 MHz precision quartz oscillators, it is necessary to undertake actions targeted for improvement of reliability, optimization of both design and electronics of oscillator and considerable improvement of performance of quartz crystal. Successful advancement in these directions was made by authors in Morion Inc. during Y 2013.