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Session P3: Advanced Clocks and Measurement Techniques

Advanced DOCXO Meeting 100…400 ns Time Interval Error its Design and Measurement
Aleksandr Kotyukov, Arkady Nikonov, Alexey Zaslavsky, Evgeny Belyaev, Morion, Inc., Russia
Location: Regency B

Ovenised precision oscillators became more and more important for modern telecommunication and measurement equipment.
The time interval error (TIE) from 1us to 100 ns in holdover mode is one of the most important requirements for 5G communication networks.
That’s why we have an important question: does stable oscillator is enough for this or do we need a rubidium oscillator?
And the answer is: double oven controlled crystal oscillator is able to meet 5G requirements. There are two important parameters of DOCXO which have a great influence on TIE during holdover period: frequency stability vs. Temperature and aging.
There are two approaches for TIE improvement: frequency vs. temperature compensation or/and aging compensation.
Frequency vs. temperature compensation seems to be an easy way but it is limited by the hysteresis of oscillator. From the other side aging compensation is limited by the non-monotonous nature of the aging curve. So we decided to improve the hysteresis of oscillator with the help of very stable DOCXO and improve monotony by using precise crystals. Such measures help us to get TIE lower than 100 ns per 4 hours.



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