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Spur caused by phase switching prescaler

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hmsheng

hmsheng

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prescaler 1/10

A phase switching prescaler is used in my PLL. The 4 phases generated by a divide-by-2 can't be matched perfactly. So fractional spurs at Fref/4 and its harmonics is large. Is there any way to overcome this problem?

Thanks
hmsheng
 

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