How to design a trimmable fractional divider?

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kukurigu

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Hello,
I need to design a trimmable fractional divider. The input frequency varies from 10 to 25MHz and the output frequency should be trimmed on-the-fly by means a GP register to 8MHz +/- 2-3%. The jitter on the output is not a big issue!
Any info is welcome!
 

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