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need help about metastability in PFD

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jill

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does anyone know some thing about the impact of
flip-flop metastabilit in tristate PFD?
 

Metastability is basically when the output is in an undetermined state. If the PFD output is (from the flipflops) metastable that would mean that it is not tracking the input any more. This would cause a dead zone in the PFD response and cause jitter at the PLL output. Hope this helps.
 

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