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High-performance systems such as routers, switches, servers, and wireless base stations typically have high-speed serial interfaces such as 1/10 Gigabit Ethernet, Fibre channel, PCI Express, and SONET/SDH.     


All of these high-speed serial interface standards share certain clock requirements. The first, and most important, the RMS Phase Jitter must be less than 1 ps over 12 kHz to 20 MHz offset range from the carrier frequency. They also require relatively high clock frequencies that can range up to 650 MHz, and of course they require differential signaling to reduce noise.     


Traditionally, to meet these demanding clock requirements, system designers use SAW oscillators or overtone crystal oscillators due to low phase noise and high stability. However, the drawback of SAW oscillators and overtone crystal oscillators are they are expensive, inflexible, and have long unpredictable lead times.     


Cypress’s FleXO family of ultra low jitter clock generators exceed the clock requirements for high-performance systems, and offer a more cost-effective and flexible solution compared to SAW oscillators and overtone crystal oscillators. Also, since FleXO can be programmed in the field using a clock programming kit, customers do not need to wait to get customized samples.

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