Sitime, the leader of clock industry, has 90% market share since it shipped MEMS oscillators in 2007. Mr. Piyush sevalia, executive vice president of sitime marketing, said: “our goal is to replace the traditional quartz crystal oscillators used by system manufacturers in the past decades with silicon oscillators.”.
Quartz crystal oscillator was widely used in various electronic products in the past. Why should sitime firmly replace quartz crystal oscillator with silicon oscillator? Mr. Piyush sevalia explained: “the quality of silicon is much more reliable than that of quartz. There are three reference indicators for clock device signals: frequency stability, relative jitter and Allen deviation. With 10 years of professional technology, we have increased the stability by 250 times; jitter has also improved by 800 times in 10 years; and Allen deviation has increased by 30000 times. “
Figure 1: frequency stability index
Piyush sevalia concluded: “Silicon oscillator has the advantages of higher performance, better reliability, smaller size and lower cost. Just as IC replaces transistor and flash replaces ordinary film, traditional quartz is likely to be replaced by silicon oscillator in the future.”
David Hsieh, vice president of Asia Pacific Sales of sitime, added: “sitime silicon oscillators are of high quality. Of the 500 million MEMS shipped from 2007 to 2015, the failure rate on site is zero, with a lifetime warranty. The customer repair rate is only 1.5dppm, compared with 50dppm for traditional first-line manufacturers and 150dppm for second-line quartz manufacturers. ” Such a low repair rate further enhances the position of MEMS in the market.
Elite, a high-end innovative product for Telecom and network equipment
With the popularity of mobile phones and computers, people’s demand for network communication is increasing day by day, and the base stations are more and more intensive. The traditional quartz crystal frequency technology is facing great challenges, such as the change of air flow and temperature, the influence of elevated and high tower vibration, outdoor high temperature, and EMI noise interference. The launch of elite is to solve the frequency problem that telecom and operators can not solve by using traditional quartz crystal oscillator in the past.
How can elite solve the frequency problem of Telecom in the actual environment?
Mr. Piyush sevalia pointed out: “there are two innovative technologies of sitime: first, dualmenstm and turboconsumptiontm provide users with the best dynamic performance; second, dualmenstm architecture can quickly make temperature compensation.”.
Mr. Piyush’s picture clearly illustrates the architecture of dual MEMS. Ordinary oscillators, whether quartz or silicon, generally have only one resonator. But the sitimeelite breaks the tradition by placing two MEMS resonators on the same wafer band. One is a real frequency resonator, the other is a temperature sensor, which can monitor the temperature of frequency at any time. Through the temperature control and temperature sensing loop, the temperature compensation can be improved. The speed is 40 times of that of traditional quartz, up to 350Hz.
Dual MEMS architecture
With elite’s unique architecture, sitime takes the lead in solving the long-standing frequency challenges in the field of telecommunications and network.
The dynamic performance is increased by 30 times, and the best performance can be maintained under the condition of air flow and rapid temperature change;
The power consumption and volume of OCXO can be reduced by 66% and 50% respectively;
Vibration resistance is increased by 30 times to ensure sustainable operation in high vibration environment;
Working temperature – 40 to 105 ℃, only it can be used for outdoor equipment without fan;
With the programmable function in the system, stratum 3 can reduce the materials required by the system, support multiple protocols and have noise resistance
Performance comparison between elite super temperature compensated oscillator and high precision 50ppb quartz temperature compensated crystal oscillator based on MEMS
Sitime technicians made a comparison between the performance of elite super temperature compensated oscillator based on MEMS and high-precision 50ppb quartz temperature compensated crystal oscillator, and vividly explained the difference between them. This test was verified from the following four aspects:
Simulation of fan flow test
Test of temperature gradient produced by heating with hot air blower
Video: performance comparison between elite super temperature compensated oscillator and high precision 50ppb quartz temperature compensated crystal oscillator based on MEMS
Elite 4 family products and their applications
Precision MEMS super TCXO and MEMS super TCXO can be supplied in the first half of 2017,
As well as the ultra-low jitter differential MEMS oscillator and MEMS VCXO that can be provided off the shelf. According to their own characteristics, the above four products can meet the market requirements of synchronous Ethernet, optical fiber, small base station, base station, cable modem, terminal system and video, smart grid, cloud server, industrial GPS, instrumentation and other applications.
Several cases analysis of elite’s super advantages
The airflow resistance of elite MEMS ensures the strength of data link and data transmission rate, and solves the problem of data packet loss caused by quartz airflow sensitivity.
The vibration resistance of elite MEMS solves the problems of connection interruption and data loss caused by quartz vibration sensitivity.
Elite super TCXO, 1 ppb / ° C, can save 70% of power consumption and reduce 50% of volume. It needs more than ± 20 ppb OCXO to solve 1 ppb / ° C IEEE1588, which is a great power consumption.
Elite integrates LDO into the interior, and has superior power supply noise elimination function to solve the power supply noise problem that quartz needs exclusive LDO to avoid.
Elite MEMS uses I2C to replace DAC. Internal programming reduces the materials required by the system, improves the noise resistance, and solves the noise problem caused by the conversion of analog signal to digital signal, which is required by traditional design.
Finally, Mr. Piyush said: “in the past ten years, with the continuous innovation of technology, we have defeated some manufacturers who are also involved in the MEMS field, and successfully occupied the market. We believe that through the innovative research and development of sitime, more and more updated technologies will be brought to consumers. “
Editor in charge: PJ