MEMS oscillators boost dynamic performance for small cells
Claimed to increase dynamic performance for small cells, microwave backhaul, synchronous Ethernet and optical equipment by a factor of 30, the Super TCXOs in the Elite series are engineered to solve long-standing timing problems in telecommunications and networking equipment, says SiTime.
Products are based on the company’s DualMEMS architecture, with Turbo Compensation. The architecture is claimed to result in robust, reliable TempFlat MEMS that eliminate activity dips and enables 30 times better vibration immunity than quartz. The DualMEMS temperature sensing with 100% accurate thermal coupling enables 40 times faster temperature tracking, claims the company, for performance under airflow and rapid temperature changes. Finally, integrated mixed-signal circuits with on-chip regulators, a temperature to digital converter (TDC) and a low-noise PLL, are claimed to deliver five times better immunity to power-supply noise, 30microk temperature resolution that is 10 times better than quartz, and support for any frequency between 1.0 and 700 MHz
As telecomms infrastructure uses 4G/5G small cells and synchronous Ethernet to increase network data capacity, components used will have high and constantly changing heat loads. The dynamic performance of precision timing components during rapid temperature change will become a critical requirement. MEMS technology inherently performs better in the presence of dynamic environmental conditions, maintains the company, and has become an alternative to quartz technology.
There are four families available. All offer 0.1pb/g vibration immunity and do not have activity dips or micro-jumps. There Stratum 3 precision Super-TCXOs are claimed to have the widest operating temperature for any TCXO, with ±100ppb frequency stability over -40 to +105 degree C. Super-TCXOs are for GNSS, industrial and automotive applications and offer ±0.5 ppm frequency stability over -40 to +105 degree C. Ultra-low jitter differential oscillators and high-temperature differential VCXOs, complete the line-up.
Engineering samples are available to qualified customers now. Samples of Elite-based Super-TCXOs are expected to be available in the first half of 2017.