Analog Bits has PCIe design kits

Analog Bits has front-end design kits for a complete PCIe clocking subsystem, which integrates the oscillator, PCIe class 100MHz reference clock generator with built-in Spread Spectrum Clock Generation (SSCG) and HCSL clock output buffer all into one macro. The Analog Bits clock PHY lowers Bill of Materials cost and saves power pins by sharing with ...

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from Electronics Weekly https://www.electronicsweekly.com/news/business/588006-2019-04/