The traditional differential oscillator technology is mainly composed of overtone crystal and quartz surface acoustic wave device SAW. MEMS differential oscillator has more advantages Traditional differential oscillator technology is mainly composed of overtone crystal and quartz surface acoustic wave device SAW. Both technologies have their own advantages and disadvantages. For the traditional quartz crystal industry, two traditional quartz technologies Process limitations have a large cause. The figure below is a comparison of a MEMS differential oscillator to a conventional differential oscillator. (For related reading, see YXC Yang Xing** "Performance and Schematic of Ultra High Performance Differential Oscillator SIT9121") Fiberglass screens have become a popular choice for homeowners seeking a reliable and durable solution for their windows and doors. These screens are made from a high-quality fiberglass material that offers numerous benefits. With their fine mesh construction, fiberglass screens effectively keep out insects and pests while allowing fresh air and natural light to flow through. They are also resistant to corrosion, rust, and fading, making them ideal for long-term use. Additionally, fiberglass screens are easy to install and maintain, providing a practical and cost-effective solution for creating a comfortable and bug-free environment indoors. Whether you're looking to improve ventilation or protect against unwanted pests, fiberglass screens offer a reliable and visually appealing option. Fiberglass Insect Screen,Fiberglass Insect Window Screen,Fiberglass Insect Screen Roll Net,Fiberglass Insect Window Net Jinwu Glass Fiber Co., Ltd , https://www.jinwuwindows.com
Traditional differential oscillator overtones are mechanical harmonics of crystal vibration. The ratio of the overtone frequency to the fundamental frequency is close to an integer multiple but not an integer multiple, which is the main difference between it and electrical harmonics. The overtone vibration has 3 overtones, 5 overtones, 7 overtones, and 9 overtones. The advantage is that the frequency stability can reach ±20ppm; the disadvantage is that the active oscillator is limited to 200MHz or less, and the oscillator above 200MHZ can only be realized by MEMS technology. The operation of the conventional quartz oscillator is unstable, and also with quartz. The stability is related to; the crystal is less reliable and sensitive to noise.
As one of the traditional quartz technologies, the quartz surface acoustic wave device SAW is also used in quartz differential oscillators. For example, the differential crystal oscillator SG3225EAN/SG-770 series recommended by Epson crystal oscillator Yangxing Technology, here is a simple description of SAW. Conventional quartz technology is commonly used in oscillators of 200 MHz or more. The advantage of SAW is that it can support applications above GHz; the disadvantages are limited to ±50ppm frequency stability, aging rate over ±10ppm in the first year and large package (7050).
A picture to understand MEMS differential oscillator
Advantages and Specifications of MEMS Differential Oscillator
The SiT9121 and SiT9122 family of MEMS oscillators are targeted at high-performance telecom, storage and networking applications such as core and edge routers, SATA, SAS, Fibre Channel host bus adapters, cloud storage, servers, wireless base stations and 10G Ethernet switches. Can be tailored to customer specifications. In addition, each product supports an industry-standard pin configuration that replaces existing quartz differential oscillators without modifying the design or layout.
Why use differential?
• >100MHz frequency, the most ideal signal integrity has been achieved
• Reduce commons noise coupling
• Reduce sensitivity to power supply noise (PSRR or PSNS)
• With a high frequency clock, the layout is simpler • Reduce EMI
Main Specifications • Output logic levels: LVPECL, LVDS, HCSL, CML
• Operating voltage: 3.3V or 2.5V (LVPECL, LVDS, HCSL, CML), 1.8V (CML only)
• Package: 6-pin, 7050 or 5032
• Basic technology: using quartz surface acoustic wave devices (SAW) or overtone crystals • Fast rise and fall times: 400 ps to 800 ps
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Comparison of MEMS Differential Oscillator and Traditional Differential Oscillator