4.5.2 PLL Driving DLL

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A DLL generates precise phase-shifted clocks. However, it cannot reduce the jitter on the reference clock. The solution is to use a PLL to clean up the jitter before driving it to one or more DLLs. This technique improves the output jitter of all the DLL outputs, but any jitter added by the DLL is still passed to the clock outputs. In this configuration, the PLL must be configured in the internal feedback mode.

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