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VCDL requirement in DLL

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gggould

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Hi,
Does anyone know what is the requirement for the VCDL delay time to avoid false locking?
My understanding is Tref>Tvcdl_min>0.5*Tref, and Tref<Tvcdl_max<1.5*Tref.
I can understand both later parts, but why does Tref>Tvcdl_min and Tref<Tvcdl_max criteria come from?

Thanks.
 

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